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2500K Instability

post #1 of 12
Thread Starter 
Recently, I decided to upgrade my RAM from 2x2GB sticks of DDR3-2000, to 2x4GB sticks of DDR3-2000. I had been running the previous sticks at 1866Mhz and 8-9-8-21 without a problem for quite some time. This is all while my CPU is running at 4.6Ghz at roughly 1.3v.

The new sticks are in, and they are at their stock timings of 9-9-9-24 (for now), and running at 1866Mhz at 1.65v. However, I'm having stability problems with these new sticks installed. I can't seem to get through more than two cycles of Prime95 on blend without a thread crashing. There isn't a blue screen, the Prime95 thread just fails, usually due to a rounding error or something. To make matters a bit more interesting, the sticks pass MemTest without a problem.

When running Small FFTs on Prime95, the CPU seems to do much better. This makes me believe something is up with my IMC, and that running 8GB is starting to strain the poor girl. When I up the VCCIO in hopes of stabilizing my IMC, it seems to crash quicker! I haven't tried moving the VCCIO voltage down yet... but maybe I'll give that a shot after I post this.

Any ideas? Let me know if there is some more information you need.

EDIT:
Just had a 101 BSOD on Small FFT's, bumped up LLC and am running the test again.
Edited by SectorNine50 - 2/12/12 at 12:30pm
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post #2 of 12
Running higher density DIMMs usually does cause some more strain on the IMC and may even cause some instability on a overclock that you previously would have thought was stable.

Try throwing your old RAM back in and see if it corrects the problems you are experiencing right now.
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post #3 of 12
Thread Starter 
Yeah, they seem to be fine with the old sticks in.

Bah... Looks like my little i5 has a crappy IMC. I bumped the RAM down to 1600Mhz, and it's rock solid.

Poop. Probably didn't need 2000Mhz sticks, then... How high can I safely take the VCCIO?
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post #4 of 12
Please set your LLC at the max, and try VCCIO between 1.05 and 1.09. Sometimes BSOD 124 and 101 may occur also for a higher than needed value. Blend it with prime95 26.6... Are you sure you are 100% HCI MemTest stable? Keep us updated... Good luck!
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by FedericoUY View Post

Please set your LLC at the max, and try VCCIO between 1.05 and 1.09. Sometimes BSOD 124 and 101 may occur also for a higher than needed value. Blend it with prime95 26.6... Are you sure you are 100% HCI MemTest stable? Keep us updated... Good luck!

I was having lock-up issues when the CPU would fall back to idle when I had the LLC cranked. Right now I have it at moderate and it seems to be stable with the memory chips at 1600Mhz.

When the VCCIO was at 1.09v, Prime (turns out that I am using 26.6) was still dropping worker threads... Very frustrating to say the least.

HCI MemTest, is that the same MemTest from memtest.org? If so, it seemed to be stable. At 1866Mhz the chips managed to clear two passes of MemTest without an error, which I thought was interesting...
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post #6 of 12
Quote:
Originally Posted by SectorNine50 View Post

I was having lock-up issues when the CPU would fall back to idle when I had the LLC cranked. Right now I have it at moderate and it seems to be stable with the memory chips at 1600Mhz.
When the VCCIO was at 1.09v, Prime (turns out that I am using 26.6) was still dropping worker threads... Very frustrating to say the least.
HCI MemTest, is that the same MemTest from memtest.org? If so, it seemed to be stable. At 1866Mhz the chips managed to clear two passes of MemTest without an error, which I thought was interesting...

Ok, HCI MemTest is not the same as the DOS themed memtest86+. You can check some OC stability of rams with hci memtest [ http://hcidesign.com/memtest/ ]. I think memtest86+ checks more about memory errors than stability, altought you can't pass it completly unstable. In what vram are you?. Hope you solve that issue.
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post #7 of 12
Thread Starter 
Okay, just ran HCI's MemTest, and it failed with both sticks installed, and then again with each stick installed individually.

Could the memory density be messing with my IMC, or does this seem like somehow I got two bad chips?

EDIT:
Submitted a case with Corsair to see what they have to say about the issue. I find it curious that I have no issue with the 2x2GB ADATA 2000Mhz chips at 1866Mhz, but it's not even close to stable on the 2x4GB Corsair 2000Mhz chips at 1866Mhz....

:::Sigh:::

Onward...
Edited by SectorNine50 - 2/14/12 at 11:49pm
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post #8 of 12
Quote:
Originally Posted by SectorNine50 View Post

Okay, just ran HCI's MemTest, and it failed with both sticks installed, and then again with each stick installed individually.
Could the memory density be messing with my IMC, or does this seem like somehow I got two bad chips?
EDIT:
Submitted a case with Corsair to see what they have to say about the issue. I find it curious that I have no issue with the 2x2GB ADATA 2000Mhz chips at 1866Mhz, but it's not even close to stable on the 2x4GB Corsair 2000Mhz chips at 1866Mhz....
:::Sigh:::
Onward...

I think IMC will be muh stressed on 2x4gb chips. Also timings on both should change since always 2gb sticks can tighten much more than 4gb sticks. I would try 1.65vram, 1.08-1.1 to 1.125 vccio, and 1866 9-10-9-27-1t. Also, what's the exact model of your Corsairs?
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post #9 of 12
Thread Starter 
Quote:
Originally Posted by FedericoUY View Post

I think IMC will be muh stressed on 2x4gb chips. Also timings on both should change since always 2gb sticks can tighten much more than 4gb sticks. I would try 1.65vram, 1.08-1.1 to 1.125 vccio, and 1866 9-10-9-27-1t. Also, what's the exact model of your Corsairs?

Yeah, I'm sure that's probably the case, as much of a bummer as that is. I tried my VCCIO at 1.1v, and didn't see much of a change. How high can I safely take that voltage?

I'm running SPD timings right now, which are setting the chips at 9-9-9-24 @ 1.65v. I'll try loosening them to their 2000Mhz settings when I get home tonight (I believe they are 9-10-9-27, like you stated). The fact that the computer isn't crashing, just those worker threads in Prime95 leads me to believe it's close to being stable. Perhaps the timings are the issue after all, good thought. Guess I assumed that the SPD timings should be loose enough to be stable... redface.gif I'll have to do some testing to find out if the extra bandwidth from 1866Mhz is worth the loss in latency over 1600Mhz with leaner timings.

The model of the sticks are: CMX8GX3M2A2000C9

Thanks for your help, by the way.
Edited by SectorNine50 - 2/15/12 at 8:55am
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post #10 of 12
You're welcome. Please tell how it went, I think you should not have any problems running them @ 1866 9-10-9-27 1.65v (That's their tested Latency @ 2000 @ 1.65 tested voltage). I wouldn't go beyond 1.15vccio for 24/7...
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