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20-06-2009, 05:34 PM
#11 (permalink)
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Conclusion
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After spending several months testing these Corsair Dominator GT 2000Mhz 7-8-7-20 triple channel modules on DFI UT X58-T3EH8 with 5 cpus, 2x i7 920 C0, 2x i7 920 D0 and a Xeon W3520 D0 cpu, I've come to the conclusion that for memory frequencies at DDR3-2000Mhz 7-8-7-20 and beyond, you're at the mercy of each individual cpu's integrated memory controller.
The key for stability is in the optimal balance in the relationship between CPU VTT, VDIMM memory voltage and to an extent Vcore, IOH/ICH voltages and Round Trip Latency (RTL) values set. All 5 cpus varied as to what CPU VTT and IOH/ICH voltages were needed to achieve stability particularly in Super Pi 32M, 8x32M Hyper Pi, and LinX stability. The range for CPU VTT voltage required for DDR3-2000Mhz 7-8-7-20 1T across all 5 cpus was between 1.37v and 1.47v. The required CPU VTT voltage jumped alot once you try pushing >DDR3-2000Mhz frequencies - CPU VTT voltage between 1.5-1.63v wasn't uncommon.
Fortunately for me, all 5 cpus I tested had strong memory controllers allowing me to push beyond DDR3-2000Mhz 7-8-7-20 frequencies. For more 4/28 beta results you can check the results posted
here.
Cooling wise, the Corsair Dominator DHX heatsinks do a very good job themselves when passively cooled although any air flow over the memory modules does help.
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