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Need advice on BIOS voltages to help stabilize XMP ram.

post #1 of 9
Thread Starter 
Hey everyone first post ><<br />
Here we go,

For the past month I've been trying to stabilize my KHX1600C9D3K2/8GX ram that has an XMP profile for 1600mhz @ 1.65v; latency of 9-9-9-27.

I haven't run memtest or anything of that nature but, I've bought some Corsair Vengeance 2x4GB DDR3-1600mhz @ 1.5v (also with XMP) with the same results.

I thought it may have had to do with my previous mobo or CPU which was Asrock Z77 Extreme4/i5 3570k and figured the power of the i5 wasn't really satisfying my music production needs.

Since then, I've upgraded to a i7 3770k, Gigabyte Z77X-UD3H motherboard and also sold the Corsair RAM kit thinking that my original KHX1600C9D3K2/8GX was probably fine.

Now, I've made clean re-install of windows following Sean's Windows 7 installation guide for SSDs and everything was smooth.

AIDA64 shows that the XMP profile uses 1.20v on the memory controller and 1.65v on DRAM voltage; I double checked this in BIOS and everything matched up. The BIOS shows profile VTT @ 1.20v but, even with the VTT Voltage option left on AUTO, it seems that the voltage isn't rising.
- Is it because the motherboard thinks it doesn't need to raise this voltage? (possibly because IB i7s can take 1600mhz natively?)

I've tried messing around with VTT Voltage and raising it to about 1.100v - 1.150v seems to definitely improve the fluidity of Battlefield 3 compared to the stock 1.050v which seems to cause stuttering in Battlefield 3. I'm using a Gigabyte GTX 670 OC and am using the latest 314.07 WHQL (I've tried different drivers just to make sure that it wasn't bad drivers causing the stuttering in BF3 which resulted in improvements but, ultimately resulting to the similar stuttering nightmare that I've been dealing with.

I feel like I'm getting closer in my adventure of finding stability but, am too scared to continue as of this moment to try and raise VCCSA (IMC as my BIOS calls it). However, it seems like raising the VTT and IMC voltage is the key to stabilizing the system.

I'm open to all suggestions and ideas as I, myself, am completely out of those.

Thanks in advance. smile.gif
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post #2 of 9
Welcome to OCN smile.gif

Up your Ram volts to 1.55v on both channels. Don't go above 1.15v with VCCSA.

This guide uses a Gigabyte mobo (UD7 but same settings as the UD3) and is a good one:
http://www.overclock.net/t/1247413/ivy-bridge-overclocking-guide-with-ln2-guide-at-the-end
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post #3 of 9
Thread Starter 
Thanks for the welcome and reply!

So, one last idea popped into my head while I was waiting for a reply and it was regarding HPET.

I remembered I used the command "bcdedit /set useplatformclock=true" in cmd and quickly read through some googled threads to get more detailed information on this command which I believe forces HPET to be used in Windows 7. I saw some people having issues but, the majority of the people who have enabled it seemed to have improved performance in overall system performance.

I just ran cmd and used the "bcdedit /deletevalue useplatformclock" and didn't expect any changes but, fortunately it seemed to have been the complete opposite. At least 99% of all the stuttering and random issues I've been seeing have disappeared (even my Windows 7 boot animation was choppy but, the disabling of HPET in Windows 7 seemed to have fixed it). redface.gif

At this point I wanted to make sure that leaving VTT and IMC Voltages on auto (just like the BIOS did) with XMP profile enabled was stable. With DRAM Voltage set to Auto, the BIOS set the voltage to XMP rated voltage of 1.65v but, it seems that a slight vdroop brings it down to about 1.644v which is awesomely and amazingly stable for the first time in a very long time biggrin.gif:D:D

After convincing myself that the system is in fact in stable condition, I took your suggestion and manually set my DRAM Voltage to 1.55v from AUTO with XMP Profile still enabled and did not touch the timings and left them on AUTO. Since it seems there is a slight vdroop on the DRAM Voltage, I set it to 1.560v and got around 1.548v. I have not touched the VTT and IMC/VCCSA voltage and system is still better than before.

2 questions:

1. When the DRAM voltage was @ 1.548v, everytime a new scene appeared in Battlefield 3, it would seem like the textures of the map were slightly delayed (ex: In the spawn selection menu, I quickly switch back and forth from RU Deployment to Flag A or B and I can literally see the ground of the map being loaded as I switch between these areas of the map). With DRAM voltage @ AUTO (1.644v), this was not visible. Is this a sign that the ram is unstable at these voltages?

2. I saw you stated to set 1.55v on both channels, do you mean just set the DRAM Voltage to 1.55v? I know there were some other memory specific voltage settings besides DRAM voltage but, I was too scared to touch them. And if I shouldn't exceed the 1.15v for IMC/VCCSA, would limit of VTT Voltage be @ 1.155v? (I saw somewhere on these forums where SiN0822 stated that when upping the VTT Voltage the IMC voltage needs to be -0.005v).

Thanks again ^^

EDIT: If any additional information on the rig is needed just let me know!

Also, it seems that my 3-4 year old PSU (OCZ600SXS) seems to be running quite hot (not hot enough for me to take my hand off of it, but very warm to make me think if it's on its last legs) when playing BF3 for about an hour or so. Additionally, it also makes a obviously audible coil whine/high pitch screaming type of sound randomly when during the system POST stage. You guys think it may be time to swap it out for a high quality one?
Edited by mr1hm - 3/16/13 at 1:49pm
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post #4 of 9
I thought your Ram operated @ 1.5v, it seems its @ 1.65v ?

Some boards use aggressive parameters when XMP is enabled which would sometimes cause instability even @ stock rated speeds & timings.

With XMP enabled, if your memory runs with 1.5v, my suggestion would be to increase it by 0.05v to 1.55v.

If its @ 1.65v, increase it to 1.68v.

Or, enter the timings (only the 1st four usually seen on the side of the stick i.e. 9-9-9-24) & adjust the speed manually, leave everything else on Auto & set the Ram volts as rated wither 1.5v or 1.65v).

As for HPET, I have it also disabled but from the Bios. Only reason I did it was due to high latency numbers when running 'DPC Latecny Checker'.
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post #5 of 9
Thread Starter 
Ahh I see.

I actually ended up purchasing 2 sticks of Samsung Green 4GB DDR3-1600mhz CL11 (http://microcenter.com/product/380719/4GB_DDR3-1600_(PC3-12800)_CL11_UDIMM_Desktop_Memory_Module) last night due to the amazing overclocking potential these modules had.

I was wondering if you can recommend some general timings or higher frequencies to start off with; I looked at a couple of threads here regarding this ram and I'm having a hard time finding numbers to start with on the Z77X-UD3H w/ i7 3770k @ stock. I don't have much experience with overclocking/lowering timings on RAM and any info is appreciated.

And, you said you disabled HPET in the BIOS as well due to high DPC latency; if I notice latency spikes here and there do you think I should disable it in the BIOS as well? Would it cause any kind of unexpected issues?

Thanks for your feedback, really appreciate it smile.gif
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post #6 of 9
Quote:
Originally Posted by mr1hm View Post

Ahh I see.

I actually ended up purchasing 2 sticks of Samsung Green 4GB DDR3-1600mhz CL11 (http://microcenter.com/product/380719/4GB_DDR3-1600_(PC3-12800)_CL11_UDIMM_Desktop_Memory_Module) last night due to the amazing overclocking potential these modules had.

I was wondering if you can recommend some general timings or higher frequencies to start off with; I looked at a couple of threads here regarding this ram and I'm having a hard time finding numbers to start with on the Z77X-UD3H w/ i7 3770k @ stock. I don't have much experience with overclocking/lowering timings on RAM and any info is appreciated.

And, you said you disabled HPET in the BIOS as well due to high DPC latency; if I notice latency spikes here and there do you think I should disable it in the BIOS as well? Would it cause any kind of unexpected issues?

Thanks for your feedback, really appreciate it smile.gif

Nice set. Heard many stories about them. We call them Wonder ram thumb.gif

Set them to 12-12-12-30 @ 1.55v with 2133MHz speed & run Prime95 with 95% of available memory to test for stability.
I'll link a guide in this post as soon as I find it biggrin.gif

HPET is basically a timer and disabling it wouldn't/shouldn't cause any issues whatsoever.
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post #7 of 9
Thread Starter 
Haha, the samsung miracle "wonder" ram thread is what actually made me go grab a pair biggrin.gif

I actually took a look at some of the timings a few of the members had and tested some of them out. I wanted to keep DRAM voltage at stock and see how far the sticks will go and ended up being able to boot at 1868mhz (due to the Gigabyte board setting BCLK @ 100.11/100.12) with no issues. I was able to boot with no problems @ 1868mhz with 9-9-9-27 and 1.360v to compensate for the motherboards AUTO vdroop on the DRAM voltage but, got too tired to check for stability.

I read upon a few more forums here and there and I saw that for gaming and other programs/software that aren't memory dependent don't really see performance gains after 1600mhz frown.gif. I stuck the ram at 1600mhz with 8-8-8-24 timings and 1.360v and seemed fine in Battlefield 3 and other tasks.

I'll try the speed and timings you've suggested and run Prime95 for a bit but, don't want to run it for too long because I feel that my Hyper 212+ isn't so efficient as it used to be.

On the otherhand, would a AIDA64 system memory stress test suffice? I believe the version of it was 2.80 which should be quite recent.

Also, I mentioned my OCZ StealthXStream 600w (OCZ600SXS) in was starting to get really warm (not hot enough to force my hand back but, still warm enough to force my attention) and has been producing coil whine/high pitch noise in one of the earlier posts. Would this be a sign to start thinking about a new power supply? If so, what are some recommendations? I'm trying to keep the price around $55-$65



Thanks for your suggestion though, gonna try it right now smile.gif
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post #8 of 9
AIDA64 or Prime is fine.

As for the PSU getting warm, that's normal. High pitch noise is sometimes normal for an old, heavily-used PSU.

Since your setup doesn't put much load on it (670 consumes less than 200w & the 3770 less than 80w stock), I normally would recommend you keep it.
However, it is not on this list http://www.overclock.net/t/183810/faq-recommended-power-supplies
which contains only quality PSUs (except for the CX430), my vote goes to replacing it with a much higher-quality unit.

If you live in NA & plan on sticking with just one GPU, best quality unit for the price is the Capstone 450 (more than enough for any single card).
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182066

The Capstone 650/750M can handle two high-end GPUs easily. And they all come with a 5 year warranty.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182263
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post #9 of 9
Thread Starter 
Gotcha, thanks for the PSU recommendation, I'll keep the list in mind when this PSU decides to take a dump on me.

As for RAM, the PC boots into windows @ 2133mhz with 1.40v-1.45v and stock timings of 11-11-11-28. But, seems unstable as I got some weird behavior with the Windows start up animation freezing before it entered into the desktop.

I decided to keep the ram @ 1868mhz with 1.368v and timings of 9-9-9-24 for now because I have some audio related related work that needs to be completed by tomorrow or the day after. I'll probably be posting in the Samsung Wonder/Miracle ram thread after I've tested the ram at its limits with screenshots of P95 testing.


eXXon, thanks for all the help, hopefully I can return the favor after I put some experience under my belt. smile.gif
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Windows 8 Professional Samsung Syncmaster 27" SA550H -2ms Response Time- ASUS VG248QE 144hz 1ms Razer BlackWidow 
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Corsair CX600M 80+ Bronze Certified Zalman Z9 Roccat Kone XTD Steel Series QCK Mass 
Audio
Focusrite Forte 
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Current Rig 2013
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 3770k @ 4.6GHz Asus Maximus V Extreme Gigabyte GTX 970 G1 Gaming Samsung Wonder Ram 2x4GB @ 2400MHz CL10 
Hard DriveHard DriveHard DriveCooling
Samsung HD103SJ / 1TB 7200RPM OCZ Vertex 3 90GB Samsung 840 Pro Series 256GB Cooler Master TPC 812 Push/Pull 
OSMonitorMonitorKeyboard
Windows 8 Professional Samsung Syncmaster 27" SA550H -2ms Response Time- ASUS VG248QE 144hz 1ms Razer BlackWidow 
PowerCaseMouseMouse Pad
Corsair CX600M 80+ Bronze Certified Zalman Z9 Roccat Kone XTD Steel Series QCK Mass 
Audio
Focusrite Forte 
  hide details  
Reply
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Overclock.net › Forums › Components › Memory › Need advice on BIOS voltages to help stabilize XMP ram.