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25-07-2009, 10:13 AM
#36 (permalink)
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Out of the box seems P6T6 WS Revo on default AUTO values is faster even for CAS9. But it means everything is set very aggressively/tight on P6T6 compared to DFI UT X58. That could be good and bad depending on whether P6T6 limits your overclocking because things are too tight. Still too early to tell but investigating
Uncore Frequency Testing - preliminary findings
As to uncore testing, i only really did max uncore extensive test with W3520 D0 on DFI UT X58 around Uncore of 4600-4760mhz for 32M pi-validations. All only i7 920 C0/D0 cpus on DFI UT X58-T3EH8, I didn't push uncore past 4200-4400mhz. On P6T6, only used my poorest/worst i7 920 3836A756 C0 #2 cpu and that easily pushed to 4200mhz uncore for 32M and 4401mhz uncore for validation. This is all on water cooled cpu. So pretty nice the differences could be due to C0 vs D0 stepping or added NF200 on P6T6 ?.
P6T6 though gains performance in 32M pi up to 4200mhz. At 4300+ uncore 32M pi loops were slower than at 4200 and below uncore, so suggests RTL latency etc was too loose at 4300+ uncore. Still more investigating need
So for you viewing pleasure
System:
Super Pi 32M
Uncore Comparisons: 16x vs 18x vs 19x vs 20x vs 21x
Testing uncore frequency on i7 920 3836A756 C0 #2 cpu with P6T6 WS Revolution 0601 beta bios and pretty much the same key voltages needed for 32M Pi stability as with
DFI UT X58-T3EH8 tests with W3520 D0 cpu - CPU VTT and VDIMM - as you push Uncore frequency higher you need more CPU VTT uncore volts (QPI/DRAM) and VDIMM
Max screenshot uncore for now is 4401Mhz
Everest Ultimate
Uncore and RTL A/B/C value comparisons
RTL A/B/C = 51/54/54
RTL A/B/C = 61/62/63
RTL A/B/C = 64/66/66
RTL A/B/C = 66/66/67
RTL A/B/C = 69/72/72
