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Need Help - Core i5 and DDR3 1600

post #1 of 14
Thread Starter 
Hello,

I have never overclocked before. I just bought a core i5 760 and 8 gigs (2 sticks) of Corsair Dominator DDR3 1600 (9-9-9-24). Also, I have a Asus P55 WS Supercomputer motherboard. From reading other posts, I know I can set the BIOS to XMP, but I am concerned about voltages. What I am looking for is to have the memory run at rated speeds (1600). I know I could up my BCLK to 160, but I would like to be able to use the advanced power features and turbo boost. I am using a Cooler Master N520 (Cooler Master CM690 with 4 fans). Should I be concerned with temps and voltages if I manually set my ram's timings and voltage plus set the BCLK to 160 (turbo boost enabled)? I am also confused on whether I should set the multiplier to 17. After reading forums all night I am still very cloudy on this, hence my concern / hesitation. Any info would be greatly appreciated. Thanks.
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post #2 of 14
I wish I can help to you cuz I almost have nearly the same specs but you have a supercomputer motherboard lol. I did too had to set the xmp cuz most of the new motherboard of ours default at 1333mhz. I'm too still puzzled with the new blck thing plus I almost was too certain if we are suppoose to let the mobo run 1333mhz default? Dunno and I do hope someone around the corner in forums to help you too.. welcome to OCN!
post #3 of 14
Thread Starter 
anyone?
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post #4 of 14
Yea anyone? biggrin.gif Lol..
post #5 of 14
Quote:
Originally Posted by KHarp1984;11735217 
Hello,

I have never overclocked before. I just bought a core i5 760 and 8 gigs (2 sticks) of Corsair Dominator DDR3 1600 (9-9-9-24). Also, I have a Asus P55 WS Supercomputer motherboard. From reading other posts, I know I can set the BIOS to XMP, but I am concerned about voltages. What I am looking for is to have the memory run at rated speeds (1600). I know I could up my BCLK to 160, but I would like to be able to use the advanced power features and turbo boost. I am using a Cooler Master N520 (Cooler Master CM690 with 4 fans). Should I be concerned with temps and voltages if I manually set my ram's timings and voltage plus set the BCLK to 160 (turbo boost enabled)? I am also confused on whether I should set the multiplier to 17. After reading forums all night I am still very cloudy on this, hence my concern / hesitation. Any info would be greatly appreciated. Thanks.

XMP are sort of just quick overclock presets to get your memory up to its rated spec. You are usually much better off inputing the settings yourself. One of the nice things I've found with the P55 boards is most allow you to keep turbo on while overclocked so that shouldn't be a problem. As long as it is a fairly low overclock.

Each BIOS is different and can call some of the same settings different names. I will try to help the best I can.

The memory speed comes from baseclock multiplied by memory multiplier. You can change both. If your BIOS has the 2:12 multipler option you could just change that and be done with it leaving most everything else stock. Or you could change your baseclock up to 160 and set the memory multiplier to 2:10. This will overclock the CPU also but is a very reasonable overclock that "most" 760's will do at stock voltage. The lower the memory multiplier the greater stability will be. Also most of ASUS's BIOS don't show the actual multipliers they just show the memory frequencies availabe at a given baseclock which are representative of the different multipliers (2:6, 2:8,2:10,2:12).

If you change the baseclock I suggest you lock in your stock voltage. So that it doesn't auto push up your voltage unnecessarily. Easiest way to find the stock voltage setting is to run TurboV that should have came on a disk with your board. Pretty useless program as you don't want to overclock with the software but it will show you what it is setting in bios for the vcore. This will save you having to trial and error getting the correct load voltage locked in. Also in some BIOS's it will list the setting it is using while in auto. Note here that the BIOS setting is different than actual voltage due to vdrop and vdroop.

You also have an "uncore voltage" that goes by a few different names. CPU VTT/IMC/ QPI ... It is a must to keep this uncore voltage within .5v of the DIMM/DRAMM Voltage. Stock uncore can be quite low and if your RAM is spec at 1.65v you could end up damaging the internal memory controller on the 760 if not careful. If the uncore voltage is too low it could also cause instability. For a low overclock and 1600MHz memory you will probably need around 1.25v but all systems are different.

The RAM Voltage (DIMM/DRAM) should be set to spec for the kit.

You should monitor temps. Especially right after making changes. If you lock in that stock voltage and have the uncore voltage set within reason you shouldn't have any problems......* Overclocking with turbo on presents a little different temp problem as the voltage in BIOS is for the CPU RATIO set in BIOS. When turbo kicks in and it ramps up to the +4 turbo multiplier it auto adds more voltage to the CPU to keep it stable. So it will run hotter when turbo kicks in. So be sure you have plenty of wiggle room on both safe voltage and safe temps if turbo is enabled while overclocked.

I'm rushing a bit because I'm about to head out the door to do some last minute Christmas shopping. So hopefully that all makes sense and answers your questions biggrin.gif If not just post any questions you have here and maybe someone will come along and answer them or I'll check the thread later tonight.


[edit]

Forgot about the 17 multiplier setting. I wouldn't. 17 would put you close to stock speed with a 160 base clock but there just isn't much need to do that. When you should be able to run 3.52GHz at stock voltage or can just change the memory multiplier.

edit again:

Leaving turbo on while overclocked can be a headache. If you up your baseclock to 160 I'd just suggest locking in the 21 CPU Ratio. Much easier and it would still be running faster than it would be at stock with the full turbo multiplier. Each mother board is going to handle how it controls those turbo multipliers differently and it takes a little playing with them to figure out how your board is going to work. Just simpler for you if you lock in a 160 X 21 overclock with a 2:10 memory multiplier.
Edited by ~sizzzle~ - 12/22/10 at 11:12am
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post #6 of 14
Thread Starter 
I set my bclk to 160 and multiplier to 21. mem is at 1600 mhz 1.65v. running prime95 my max core temps only got to 53 deg C. Does that seem kind of low for being overclocked. It idles at around 30 deg C. I am using Core Temp 0.99.8 and CPU-Z. I am concerned because most things I read said max temps under stress test should be around 70 deg C. I also tried the IntelBurn test at maximum for 5 times and got the same temps. My Vcore is showing 1.36v max. (it is currently set to auto.)
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post #7 of 14
XMP takes care of all settings, voltage included. So I'd go with the XMP enabled if your MB supports it. I could not get these 1066 to run at 1066 without EPP (same as XMP, different RAM) without going to 7-8-7-27, and even then it would restart or crash to desktop at times. With EPP enabled (and only 2 sticks, 4 sticks won't work with XMP/EPP) I can run them at 1066 5-5-5-15-23 all year long, no restarts, nothing. I can't OC them, that's the only downfall of the program, that disables XMP/EPP, any setting change will of course disable XMP/EPP. Thank God for multipliers.
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post #8 of 14
Quote:
Originally Posted by KHarp1984;11747598 
I set my bclk to 160 and multiplier to 21. mem is at 1600 mhz 1.65v. running prime95 my max core temps only got to 53 deg C. Does that seem kind of low for being overclocked. It idles at around 30 deg C. I am using Core Temp 0.99.8 and CPU-Z. I am concerned because most things I read said max temps under stress test should be around 70 deg C. I also tried the IntelBurn test at maximum for 5 times and got the same temps. My Vcore is showing 1.36v max. (it is currently set to auto.)

Temps are fine and just a little over what I get on stock voltage. The vcore will have alot more to do with your temps than CPU Frequency.
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post #9 of 14
Quote:
Originally Posted by KHarp1984;11747598 
I set my bclk to 160 and multiplier to 21. mem is at 1600 mhz 1.65v. running prime95 my max core temps only got to 53 deg C. Does that seem kind of low for being overclocked. It idles at around 30 deg C. I am using Core Temp 0.99.8 and CPU-Z. I am concerned because most things I read said max temps under stress test should be around 70 deg C. I also tried the IntelBurn test at maximum for 5 times and got the same temps. My Vcore is showing 1.36v max. (it is currently set to auto.)

I would not leave voltages on auto.

Load optimized defaults, turn off C state, speed step & EIST. See what your bios default voltage is and set it there manually for the CPU Core & set CPU Vtt to 1.15 (do not go lower than .50v of your ram - 1.65v ram = 1.15v VTT & higher when needed)

Best way to OC your cpu is set both voltages to the default manually, then start increasing the bclck 10 at a time and test with Prime95 for an extended period (8 - 12 hours) if it passes, increase bclck and try again, if it fails raise both vcore and vtt 2 spots. test & repeat....

1.35v on the core should be good for near 4.0, some even hit 4.0 on 1.30v and lower..... All depends on the cpu... Mine likes voltage...

this method will give you the lowest voltage & highest clocks..

keep temps below 72c...
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post #10 of 14
Quote:
Originally Posted by 10acjed;11750015 
I would not leave voltages on auto.

Load optimized defaults, turn off C state, speed step & EIST. See what your bios default voltage is and set it there manually for the CPU Core & set CPU Vtt to 1.15 (do not go lower than .50v of your ram - 1.65v ram = 1.15v VTT & higher when needed)

Best way to OC your cpu is set both voltages to the default manually, then start increasing the bclck 10 at a time and test with Prime95 for an extended period (8 - 12 hours) if it passes, increase bclck and try again, if it fails raise both vcore and vtt 2 spots. test & repeat....

1.35v on the core should be good for near 4.0, some even hit 4.0 on 1.30v and lower..... All depends on the cpu... Mine likes voltage...

this method will give you the lowest voltage & highest clocks..

keep temps below 72c...

This, I missed the auto voltage @ 1.36v part last night. doh.gif

I think I covered the VTT/IMC and setting the vcore in my first post.headscratch.gif

72C temps are nice but I'm ok with keeping max core temps below 80C while testing.
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