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post #10311 of 10697

Hi Friends,

 

A few inquiries:

 

RAM/Memory Settings

 

  1. I have kept this thread as my personal reference since it talks about the exact motherboard that I have: The ULTIMATE Sandy Bridge OC Guide + P67A-UD7 Performance Review.
  2. On Post #2 of the said guide/thread, it says:

 

Quote:
VDDQ: more commonly known as Vdimm or Vdram, this is the voltage for your memory. Formally known as I/O voltage for DDR3, Intel states maximum at 1.575. YOU should run this at whatever it says on your RAM. At the time I am writing this article, 1.575 is not the standard, but 1.5v has been stock voltage on many DDR3 RAM modules for a long time. While at 1.5v you can run at stock speed of 1333 MHz and SPD 9, 9,9,24 to run your RAM at a higher speed, such as 1600MHz, most RAM requires 1.65v. Do not be afraid, if it says 1.65v on your RAM stick, set it to 1.64 or 1.66v. For overclocking higher than what your RAM is rated for you can take this up, I have used up to 1.76v, but for my tests I used 1.72v to run my 1600mhz Ram at 1866mhz. I wouldn’t run this voltage over 1.8v unless you are going for some crazy high clocks.

 

  1. Also munaim1 mentioned the same in the 2500K overclocking help thread:
Quote:
Wow now that certainly helps. Drop the VTT back to stock for now and lets try and see what we can do with the PLL voltage.

Drop the PLL votlage all the way down to 1.55v and work your way up, as you have shown the results for vcccio do the same for the PLL voltage. Remember in small increments.

By the way make sure your RAM is runnign at it's rated voltage, sometimes vdrop caues it to be a litte less than what is set.

Report back when you have done that.

Later we'll try and combine a 'good' vtt amount with a 'good' PLL value and see if that helps.

 

  1. Here is the brand of RAM/Memory that I am using: CMP4GX3M2A 1600C9.
  2. On my BIOS, the said brand of RAM/Memory runs at 1333MHz with 1.5 volts.
  3. Based from Corsair's website, it says:

 

Quote:

Product Description

High-performance 4GB Dominator kit for dual channel systems, 1600MHz, 9-9-9-24, 1.65V

Key Features

  • Includes XMP performance profile
  • Guaranteed to work on all dual channel Intel platforms
  • Black heat sinks with patented DHX Technology
  • World famous Corsair reliability and performance

Package Contents

Two 2GB memory modules

System Requirements

Designed for use with all DDR3 motherboards with two memory channels

 

Quote:
Warranty Lifetime
Size 4GB Kit (2 x 2GB)
Performance Profile XMP
Fan Included No
Heat Spreader DHX+
Memory Configuration Dual Channel
Memory Type DDR3
Package - Memory Pin 240
Package - Memory Format DIMM
Tested Voltage 1.65
SPD Voltage 1.5
Speed Rating PC3-12800 (1600MHz)
SPD Speed 1333MHz
Tested Speed 1600Mhz
Tested Latency 9-9-9-24
SPD Latency 9-9-9-24

 

My question: The P67-UD7 guide (and other threads and posts) says that RAM should be run at its "stated timings". For my RAM, what are the "stated timings"? Is it the 1333MHz at 1.5 volts? Or is it the 1600MHz at 1.65V (and hence I should configure in BIOS for the RAM to run this way)? Or do I just set it to 1600MHz and just keep the RAM's voltage at 1.5 volts?

 

Or...do I just leave it as-is (where it runs at 1333MHz @ 1.5 volts)? Is the 1600MHz an "overclocked" state of this particular RAM? Or is 1600MHz the real/stated speed of the RAM but it just "down-clocks" to 1333MHz? It confuses me because by then it would mean that the "stated/rated speed" is actually an "overclocked speed", yes/no?

 

The reason I am asking is because of this:

 

 

 

 

 

Comparison of Same Overclock with Different Offset 05.20.2013.png 25k .png file

 

 

 

 

 

  1. The table at the left gives a lower temperature, however it fails Prime95 after the 3rd hour with a BSOD Code of 124.
  2. The table at the right is the raw data of my previous official submission of 4.4GHz overclock, found in Page 1025 of this thread.
  3. I have been reading about one of the resources about Sandy Bridge Overclocking (Solving/Fixing BSOD 124 Errors on Sandy Bridge) and specifically read up on the reference thread for solving BSOD 124 while stress-testing. So far from the time I started learning to overclock, I respond/fix BSOD 124 by only touching/tweaking the VCore.
  4. I'd like to see if running the RAM/Memory at is "stated timings" would somehow help, before I step into tweaking VCCIO (Vtt/QPT) and PLL.

 

Query about PLL (Phase Lock Loop)

 

Two posts make reference about allowing or possibly lowering VCCIO (QPT/Vtt):

 

  1. Sin0822's post in the ULTIMATE Sandy Bridge OC Guide + P67-UD7 Performance Review

 

Quote:
VCCPLL: Commonly known as CPUPLL, this voltage is for the internal clock generator for the CPU. Intel states maximum at 1.89v, and stock at 1.8v.

What does the PLL do, you ask? Here is how you get 3.4 GHz. A constant frequency input (BLCK) is generated by the PCH (P67), the BLCK is then multiplied by the core ratio by the internal phase lock loop (PLL) and then you have a greater resulting core frequency. CPU PLL is the PLL that gives you 3.4 GHz at stock and 5.2 GHz overclocked.

I would leave this voltage at stock, at one point I thought this voltage helped me lower Vcore, but it was just the processor playing tricks on me. In fact on X58 systems lowering the CPU PLL was thought to help lower temperatures and thus improve stability, on the other hand at very high frequencies this voltage is creased by many overclockers. I say increase it to 1.89v if you like, but don’t go north of that, if you want to save power and keep temperatures low turn it down to 1.71v.

 

  1. munaim1's post in the 2500K overclocking help thread (referenced post for solving BSOD 124 during stress test)

 

 

Quote:
Wow now that certainly helps. Drop the VTT back to stock for now and lets try and see what we can do with the PLL voltage.

Drop the PLL votlage all the way down to 1.55v and work your way up, as you have shown the results for vcccio do the same for the PLL voltage. Remember in small increments.

By the way make sure your RAM is runnign at it's rated voltage, sometimes vdrop caues it to be a litte less than what is set.

Report back when you have done that.

Later we'll try and combine a 'good' vtt amount with a 'good' PLL value and see if that helps.

 

My question: Is it okay to try and "blend" or "mix" a lowered PLL with running RAM at its "stated timings"? Is touching PLL usually a "lower priority/step" i.e. touch other voltage settings first like VCCIO (QPT/Vtt), RAM settings, etc. before touching PLL?

 

Thanks in advance!


Edited by topet2k12001 - 5/20/13 at 2:57am
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post #10312 of 10697
Quote:
Originally Posted by topet2k12001 View Post

My question: The P67-UD7 guide (and other threads and posts) says that RAM should be run at its "stated timings". For my RAM, what are the "stated timings"? Is it the 1333MHz at 1.5 volts? Or is it the 1600MHz at 1.65V (and hence I should configure in BIOS for the RAM to run this way)? Or do I just set it to 1600MHz and just keep the RAM's voltage at 1.5 volts?

Or...do I just leave it as-is (where it runs at 1333MHz @ 1.5 volts)? Is the 1600MHz an "overclocked" state of this particular RAM? Or is 1600MHz the real/stated speed of the RAM but it just "down-clocks" to 1333MHz? It confuses me because by then it would mean that the "stated/rated speed" is actually an "overclocked speed", yes/no?

Do you still have the packaging for your RAM? If so it would give you a definitive answer as to what the settings are for your RAM. If not another way to possibly see what they are is to set your RAM using XMP since it supports it. This will then set the profile for you (automatically) and you'll be able to see what it sets for you. Then if you still want to set it manually you can go back and set the correct settings as to what the XMP profile states.

Edit: I've found this http://forum.corsair.com/v3/showthread.php?t=99596 looks as if your stock values are 1.5v and 1333MHz and that Corsair have tested the RAM can go to 1600MHz at 1.65v I would suggest while overclocking to set the lower values until you know you are stable and then look to in essence overclock your RAM. You may be able to get away with a lower voltage and a higher speed than stated but I cant say for certainty as I've never overclocked RAM. The reason being that I've read RAM speeds although good have never been a major factor in Sandy Bridge chips. Heres an old article I used for when I purchased my RAM: http://www.bit-tech.net/hardware/memory/2011/01/11/the-best-memory-for-sandy-bridge/
Quote:
Originally Posted by topet2k12001 View Post

My question: Is it okay to try and "blend" or "mix" a lowered PLL with running RAM at its "stated timings"? Is touching PLL usually a "lower priority/step" i.e. touch other voltage settings first like VCCIO (QPT/Vtt), RAM settings, etc. before touching PLL?
Thanks in advance!

My understanding and this could be wrong so please someone else step in if I am is...

VCCIO and PLL are lower on the list of voltages to set, especially for our lower clocks (4.5 or below). However as with any overclocking its always nice to set these (or at least I think it is biggrin.gif). My plan was once I got to a stable clock that I'm happy with to then lower the PLL to around 1.4v and work my way up until it was stable again. Once stable then I'd lower my VCCIO and up that slowly until it was stable again. The beauty of these two voltages are once you've found your sweet spot on them you wont need to change them for future runs (or at least that's my understanding). Also its been known that if you were able to get the PLL voltage lower than the default (around 1.7v) then you'll a, have lower temps and b, may be able to get away with taking your overall vCore voltages down a few notches. Again these are just my ideas that I've not been able to put into practice yet since I've been pressed for time. But would be cool if someone who has made these changes commented to at least show its the right path/thinking.
post #10313 of 10697
I haven't messed with OCing my Sandy in a long time, I got it up to 4.7GHz unstable. I would like to get to 4.8 stable with my new water loop. Can't wait to start back up later tonight.
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post #10314 of 10697
Quote:
Originally Posted by Eaglesfan251 View Post

I haven't messed with OCing my Sandy in a long time, I got it up to 4.7GHz unstable. I would like to get to 4.8 stable with my new water loop. Can't wait to start back up later tonight.

Keep us posted how you get on! Were you on air cooling before?
post #10315 of 10697
Quote:
Originally Posted by Durden View Post

Keep us posted how you get on! Were you on air cooling before?
I was running an H80 and wound up going back to stock because it made my room very hot in the summer. I was folding and I have no A/C. I'm not going to be folding as much, just gaming.

I have it set now to 4.5 with a 1.375 Vcore. 1.35 Just gave me a 101 BSOD. Its been stable for about 30 mins on a prime blend. I'm probably going to need some help hitting 4.8, I forgot a lot about OCing these chips.

Edit: Just BSODd about 40 mins in.
Edited by Eaglesfan251 - 5/20/13 at 3:24pm
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post #10316 of 10697
Quote:
Originally Posted by Eaglesfan251 View Post

I was running an H80 and wound up going back to stock because it made my room very hot in the summer. I was folding and I have no A/C. I'm not going to be folding as much, just gaming.

I have it set now to 4.5 with a 1.375 Vcore. 1.35 Just gave me a 101 BSOD. Its been stable for about 30 mins on a prime blend. I'm probably going to need some help hitting 4.8, I forgot a lot about OCing these chips.

Edit: Just BSODd about 40 mins in.
Sorry to hear about your clock frown.gif

Always willing to help! I filled in a template a little while back if you post up your settings using something similar can try my best to see what jumps out!
post #10317 of 10697
Quote:
Originally Posted by Durden View Post


Do you still have the packaging for your RAM? If so it would give you a definitive answer as to what the settings are for your RAM. If not another way to possibly see what they are is to set your RAM using XMP since it supports it. This will then set the profile for you (automatically) and you'll be able to see what it sets for you. Then if you still want to set it manually you can go back and set the correct settings as to what the XMP profile states.

Edit: I've found this http://forum.corsair.com/v3/showthread.php?t=99596 looks as if your stock values are 1.5v and 1333MHz and that Corsair have tested the RAM can go to 1600MHz at 1.65v I would suggest while overclocking to set the lower values until you know you are stable and then look to in essence overclock your RAM. You may be able to get away with a lower voltage and a higher speed than stated but I cant say for certainty as I've never overclocked RAM. The reason being that I've read RAM speeds although good have never been a major factor in Sandy Bridge chips. Heres an old article I used for when I purchased my RAM: http://www.bit-tech.net/hardware/memory/2011/01/11/the-best-memory-for-sandy-bridge/
My understanding and this could be wrong so please someone else step in if I am is...

VCCIO and PLL are lower on the list of voltages to set, especially for our lower clocks (4.5 or below). However as with any overclocking its always nice to set these (or at least I think it is biggrin.gif). My plan was once I got to a stable clock that I'm happy with to then lower the PLL to around 1.4v and work my way up until it was stable again. Once stable then I'd lower my VCCIO and up that slowly until it was stable again. The beauty of these two voltages are once you've found your sweet spot on them you wont need to change them for future runs (or at least that's my understanding). Also its been known that if you were able to get the PLL voltage lower than the default (around 1.7v) then you'll a, have lower temps and b, may be able to get away with taking your overall vCore voltages down a few notches. Again these are just my ideas that I've not been able to put into practice yet since I've been pressed for time. But would be cool if someone who has made these changes commented to at least show its the right path/thinking.

 

Hi Friend,

 

Thanks so much for helping provide more clarity. :) To make sure I understood correctly:

 

  1. XMP is like a "pre-configured" overclocked settings for RAM, yes/no?
  2. I am actually not interested in overclocking the RAM since a lot of guides say the same thing you mentioned (...that overclocking RAM is not really a big factor in Sandy Bridge chips). Just wanted to ensure that I am really running the RAM at its "stated timings".
  3. I guess that's what makes me confused. If I am to look at the packaging/sticker on the RAM/things written on the Corsair website...it leads me to believe that 1600MHz @ 1.65V is the "stated/rated settings"...but 1600MHz @ 1.65V is actually overclocking the RAM?

 

 

Quote:
Originally Posted by Durden View Post

VCCIO and PLL are lower on the list of voltages to set, especially for our lower clocks (4.5 or below). However as with any overclocking its always nice to set these (or at least I think it is biggrin.gif). My plan was once I got to a stable clock that I'm happy with to then lower the PLL to around 1.4v and work my way up until it was stable again. Once stable then I'd lower my VCCIO and up that slowly until it was stable again. The beauty of these two voltages are once you've found your sweet spot on them you wont need to change them for future runs (or at least that's my understanding). Also its been known that if you were able to get the PLL voltage lower than the default (around 1.7v) then you'll a, have lower temps and b, may be able to get away with taking your overall vCore voltages down a few notches. Again these are just my ideas that I've not been able to put into practice yet since I've been pressed for time. But would be cool if someone who has made these changes commented to at least show its the right path/thinking.

 

Got it. I just increased my Offset VCore up by just a notch (from -0.015 to -0.010) instead of trying hard to keep it at my desired Offset VCore (-0.015) and having to play with PLL and VCCIO (QPT/Vtt). Temperature-wise the data showed me that there is no difference, so I agree....at mild to mid-overclock (i.e. up to 4.5GHz), there may not yet be a need to start tweaking the PLL and VCCIO (QPT/Vtt).

 

Will post the data and put them in charts again for comparison! :)

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post #10318 of 10697
Quote:
Originally Posted by Durden View Post

Sorry to hear about your clock frown.gif

Always willing to help! I filled in a template a little while back if you post up your settings using something similar can try my best to see what jumps out!

Used your template and started at 45x @ 1.30v and increased by 0.005 each run. BSODd < 1 minute into each test up to 1.34v. Haven't gone any further because it was on my work lunch break biggrin.gif
Seems a little high, but it did take me over 1.425v to get 4.7GHz unstable before. I guess my chip isn't all that great.
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post #10319 of 10697
Quote:
Originally Posted by topet2k12001 View Post

Hi Friend,

Thanks so much for helping provide more clarity. smile.gif To make sure I understood correctly:
  1. XMP is like a "pre-configured" overclocked settings for RAM, yes/no?
  2. I am actually not interested in overclocking the RAM since a lot of guides say the same thing you mentioned (...that overclocking RAM is not really a big factor in Sandy Bridge chips). Just wanted to ensure that I am really running the RAM at its "stated timings".
  3. I guess that's what makes me confused. If I am to look at the packaging/sticker on the RAM/things written on the Corsair website...it leads me to believe that 1600MHz @ 1.65V is the "stated/rated settings"...but 1600MHz @ 1.65V is actually overclocking the RAM?

From my understanding XMP is the preset values your RAM has been setup with by Corsair. So not overclocked per-say just its defaults. If the forum post I found was anything to go by then your defaults should be the 1333MHz and 1.5v but XMP will definitely give you the correct settings.
PS. Still baffles me their reasoning for giving two sets of figures... I guess it makes good sales to post higher speeds biggrin.gif
Quote:
Originally Posted by topet2k12001 View Post

Got it. I just increased my Offset VCore up by just a notch (from -0.015 to -0.010) instead of trying hard to keep it at my desired Offset VCore (-0.015) and having to play with PLL and VCCIO (QPT/Vtt). Temperature-wise the data showed me that there is no difference, so I agree....at mild to mid-overclock (i.e. up to 4.5GHz), there may not yet be a need to start tweaking the PLL and VCCIO (QPT/Vtt).

Will post the data and put them in charts again for comparison! smile.gif

There may not be a big difference but at least you'll know what you'd need to set if you were to push your clock more as these values tend not to change much!
Quote:
Originally Posted by Eaglesfan251 View Post

Used your template and started at 45x @ 1.30v and increased by 0.005 each run. BSODd < 1 minute into each test up to 1.34v. Haven't gone any further because it was on my work lunch break biggrin.gif
Seems a little high, but it did take me over 1.425v to get 4.7GHz unstable before. I guess my chip isn't all that great.

Mine took roughly 1.375 to be stable at 4.5GHz, what does your voltage read under load within Windows?
post #10320 of 10697
Quote:
Originally Posted by Durden View Post

From my understanding XMP is the preset values your RAM has been setup with by Corsair. So not overclocked per-say just its defaults. If the forum post I found was anything to go by then your defaults should be the 1333MHz and 1.5v but XMP will definitely give you the correct settings.
PS. Still baffles me their reasoning for giving two sets of figures... I guess it makes good sales to post higher speeds biggrin.gif
There may not be a big difference but at least you'll know what you'd need to set if you were to push your clock more as these values tend not to change much!
Mine took roughly 1.375 to be stable at 4.5GHz, what does your voltage read under load within Windows?
It jumped between 1.344, 1.352, and 1.360.

Edit: Made my way up to 1.395v and went 35 minutes until a BSOD. Currently 25 mins into the 1.400v testing.

Edit: 1hr 10 mins in, haven't gone over 61C in a 23C room. Voltages are fluctuating between 1.408, 1.416, 1.424.

BSOD 2hrs 10 mins in.
Edited by Eaglesfan251 - 5/21/13 at 1:38pm
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CPUMotherboardGraphicsRAM
i7 2630QM Clevo P151HM1 nVidia GeForce GTX 560M 8GB DDR3 1333MHz  
Hard DriveOS
750GB 7200RPM Windows 7 Ultimate x64 
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  • [Official] The Sandy Stable Club **Guides, Voltages, Temps & BIOS Templates** Inc SPREADSHEET
Overclock.net › Forums › Intel › Intel CPUs › [Official] The Sandy Stable Club **Guides, Voltages, Temps & BIOS Templates** Inc SPREADSHEET