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problem with crysis, suspect RAM OC problem

post #1 of 6
Thread Starter 
Hi! I recently did some light OC, and since then crysis has been very unstable - freezes randomly (every 20 minutes or so) and windows pops up "program stopped working" or something like that, but NOT BSOD. Before tweaking crysis was perfectly stable (never crash once in the entire SP). My sys spec and OC info are as follows:

MB: Gigabyte Z77X-UD3H
i5-3570K at 4.3GHz (set turbo multiplier to 43*), CPU Vcore using "normal" (=1.155V) and an DVID (offset) of -0.03 V (yes negative). PLL changed from default 1.8V to 1.65 V.
RAM: Kingston HyperX 8GB (default 1333MHz at 1.5 V or XMP 1600MHz at 1.65V). Timing is 9-9-9-24 (I think), I left timing at default and didn't touch that. I set the frequency to 1600 MHz but increased the DRAM V to only 1.55 V because I don't like the high voltage, although I am aware that Kingston only tested this RAM at 1600MHz at 1.65V.

This sys config passes mulitple IBT (standard/1GB or high/2GB, default 10 cycles), CPU Vmax monitored by CPUz is 1.152 V. Surely this is not the only way to make sure the system is stable.

So for the problem with crysis, I am wondering if it's because of any of the following problems?

1. CPU: is it possible that I undervoltaged the CPU too much? But then if the CPU voltage is too low it should be BSOD not quitting program right? I tried to even undervoltage further and experienced BSOD when running IBT. And crysis shouldn't use more CPU power than IBT right? The CPU temperature when running crysis hardly went beyond 50 °C. IBT Tmax is 64 °C.

2. RAM: this is the part I most worried about. As said Kingston does not promise this RAM to function properly at 1600 MHz at 1.55V. How do I test the stability of the RAM specifically? Also, does the symptoms I describe match those typically seen when RAM is poorly configured (i.e. program quitting instead of entire system failure/BSOD)?

3. Least likely, but thought I should mention: nVidia's newest driver 310.70 - WHQL released on Dec 17. Could that be the cause of unstable gaming?

This is my first thread here, and I am new to OC, so if I missed some information please point out.

Thanks a lot!
post #2 of 6
Quote:
Originally Posted by tttttc 
RAM: Kingston HyperX 8GB (default 1333MHz at 1.5 V or XMP 1600MHz at 1.65V). Timing is 9-9-9-24 (I think), I left timing at default and didn't touch that. I set the frequency to 1600 MHz but increased the DRAM V to only 1.55 V because I don't like the high voltage, although I am aware that Kingston only tested this RAM at 1600MHz at 1.65V.
This sys config passes mulitple IBT (standard/1GB or high/2GB, default 10 cycles), CPU Vmax monitored by CPUz is 1.152 V. Surely this is not the only way to make sure the system is stable.


Why would you only test with 2GB of ram when you have 8GB total ram. Download prime95 and use max ram and test. As it seems you aren't running IBT correctly to begin with. My suggestion is go read up on overclocking and then try to do one thing at a time. Since the game was fine at stock, return to stock and play the game. Thanks
post #3 of 6
Lower your ram clock on your gpu and see if that helps.
post #4 of 6
Thread Starter 
Will try running IBT using "all" setting.

The GPU memory clock was left at default (1500 MHz). I didn't OC the GPU. Should I still lower the GPU memory clock? Could you explain how that might help? Thanks.
Edited by tttttc - 12/25/12 at 1:35pm
post #5 of 6
For RAM testing, you can do a 32M hyperpi run as a quick test first (remarkably quick way to find obvious errors), or run Prime95 custom blend with 90% memory used or IBT maximum problem size for a few hours for a more thorough test. If possible run a bootable memory test as well so you're sure all your RAM is tested.
Undervolting and overclocking simultaneously isn't the best way to go about overclocking your memory, by the way.
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Intel Core i7 3820 Sabertooth X79 ASUS GeForce GTX 680 ASUS GeForce GTX 680 
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Samsung low profile x4 OCZ Vertex 3 Crucial M4 Samsung HD103SJ 
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Lite-On BD drive Megahalems rev. B Cooler Master Excalibur Windows 7 home premium x64 
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post #6 of 6
Thread Starter 
I ran the IBT "maximum memory" for 10 cycles and passed the test. HCIMemTest >100% coverage no problem (please I know >200% is needed to confirm). However, crysis 1 and crysis 2 both crash (especially 2 crashes frequently). So I decided to increase the DVID from -0.03V to -0.02 V. Now IBT max Temp increased from 64 to 67 °C (according to HWMonitor), and the max voltage is 1.164V. Crysis 2 for hours without a problem.

I read somewhere that CPU requires higher voltage when idle than under max load (e.g. IBT). Why's that the case? Also, what does it mean when the system is stable for IBT but not for moderate to high CPU load?
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