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Need help tightening tRFC timing for Samsung RAM at CL9 2133.

post #1 of 4
Thread Starter 
4.8Ghz i5 2500k
ASRock P67 Extreme4 Gen3
2x4GB Samsung Green RAM at 2133Mhz 9-10-10-27 1T at 1.53v stable (tRFC at auto is 173; 1.116v VTT-IMC)
Testing with 4 instances of Memtest at 1800MB each.

I could not get tRFC stable at 96, 128, or 144 using a combination of the following ranges at each tRFC timing:
+.04v to .05v CPU Vcore offset
1.116v to 1.155v VTT or IMC
1.53v to 1.575v DRAM (Haven't gone higher)
All other sub-timings on auto

I've gone through both Samsung threads and most people have their tRFC set at 96, 128, or 144 for two or more DIMMs at 1.5v to 1.55v at 2133Mhz CAS9.
The only difference I can tell is that they're on Ivybridge or Sandybridge-E.

Any advice is appreciated.
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post #2 of 4
IMC, motherboard (both hardware and firmware), and individual DIMM quality can heavily influence what timings are stable.

Tightening tRFC does almost nothing for performance, so my advice would be to not bother.

If you insist on tweaking tRFC as much as possible, I would get a handle on your other sub-timings first, and then adjust tRFC in smaller increments.
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by Blameless View Post

IMC, motherboard (both hardware and firmware), and individual DIMM quality can heavily influence what timings are stable.

Tightening tRFC does almost nothing for performance, so my advice would be to not bother.

If you insist on tweaking tRFC as much as possible, I would get a handle on your other sub-timings first, and then adjust tRFC in smaller increments.

I was under the impression it did improve responsiveness, at least a little bit. I already set tRFC back on auto and started focusing on the four main timings and left everything else on auto.

I think I'm borderline stable with 2133Mhz 9-10-10-27 1T. I got an error on memtest at 460%. After bumping vDIMM voltage and restarting it error'd out at 13%. I think I may be over volting it with 1.545v. Trying 1.515v now. Also my IMC/VTT is picky with voltage past 1.116v and also results in negative scaling which seems very weird. If that doesn't work, I'll loosen tRAS to 28.

Would changing tWCL/tWL make a difference in stability like how the TPU review states for CAS latency? My ASRock seems to lock that timing to 8.

Thanks Blameless.
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post #4 of 4
Quote:
Originally Posted by Rpg2 View Post

Would changing tWCL/tWL make a difference in stability like how the TPU review states for CAS latency? My ASRock seems to lock that timing to 8.

It might, but lowering tWCL is usually a performance tweak and I rarely see less stability with it at a higher setting.
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