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* Resolved* 3930k gets lower IBT gflops after RAM swap and format

post #1 of 4
Thread Starter 
Hey guys, I've had this 3930k build for almost 2 months. Discovered I had bad RAM in it last week so I swapped it for 4x4gb of Mushkin Enhanced running at 1600mhz 9-9-9-24 1t. The faulty RAM was a 4x4gb GSkill kit running at 1600mhz 9-9-9-24 1t , same speeds and timings.

Problem is that I'm getting more than 10 less gflops in IBT with the Mushkin RAM, Cinebench 11.5 on the other hand is returning similar results between RAM kits. What gives?

Same drivers are installed, also using the same version of IBT and Cinebench 11.5.

Mushkins passed Memtest86.

Do I have cause for concern or am I overreacting?
Edited by Trogdor - 3/1/13 at 12:55am
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post #2 of 4
That sounds odd, although that isn't a huge change. Do you know if all of the timings are the same (not just the 9-9-9-24-1T) - they could still be a little different even if the primary timings are the same. Personally I wouldn't worry about it too much.
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post #3 of 4
Thread Starter 
I haven't looked into what the rest of the timings are set to on the Mushkins. I wouldn't be able to reference them to the GSkills either since I didn't record anything other than the main timings redface.gif

I ended up ordering another set of the same GSkill to see if it is indeed something with the Mushkin RAM or something else all together.

Thanks for the input thumb.gif
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post #4 of 4
Thread Starter 
Got the replacement GSkill Ripjaw X 4x4GB kit today and performance is back to normal.

The problem was that the tRFC (Row Refresh Cycle Time) on the Mushkin kit was set to something in the lower 200 range while the GSkill kit runs at 128. Apparently that's a hugely important clock when running LinX tests. I also had a hit and miss issue with IBT and the Mushkins, a full 25 runs would pass but might not pass the next 25 if restarted and ran again. So this kit certainly wasn't stable. They did pass 6 hours of Prime95 small FFT though, not nearly as much RAM is used.

Instead of dicking around with the Mushkins, I'll be returning them. They also have some very small marks on the contacts that I noticed before installing them but didn't think too much about because they aren't centered on each contact.

Anyway, pics of the IBT runs. First is the GSkills, second is the Mushkins and third through fifth is the contacts on the Mushkins. The marks look small but I assure you I could see them with my naked eye without my glasses. The GSkill contacts are perfect.






Edited by Trogdor - 3/2/13 at 2:50pm
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So Quiet
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