2 x (F2-8500CL5D-4GBPK) and Asus p5Q turbo

[EB1000]

Hi

I have an older system running F2-8500CL5D-4GBPK on Asus P5Q Turbo with E7500 * 3.66Ghz (333Mhz FSB). The system is rock stable both Prime95 and memtest86 can run forever w/o any errors. I recently decided to install Win7 64bit and got a second pair of F2-8500CL5D-4GBPK so now I have a total of 8GB DDR2 dual channel. Windows 7 64bit works ok, but I noticed that prime95 test fails after 20minutes. I ran memtest86 (using bootable cd) and it showed errors after completing 20% of the tests. I tried only the new 4GB pair alone and they seem to work rock solid just like the older couple on either slot pair

Then I tried raising both the FSB-Termination voltage to 1.4V and the NB voltage to 1.44V. Now Prime95 can be run for about 6 hours until error occurs and memtst86 was able to complete 2 passes of full tests and failed on 40% of the third test. Can I rais the NB and or the FSB-VTT more to arround 1.5V (Above 1.6V bios warns about better coolong solution for NorthBridge). Is there anything else I can try? Here are my settings:


AI Overclock Tuner - Manual
CPU Ratio Setting - 11
FSB Frequency - 333
PCIE Frequency - 100
FSB Strap to North Bridge - 333
DRAM Frequency - DDR2-1066
tCL - 5 DRAM Clocks
tRCD - 5 DRAM Clocks
tRP - 5 DRAM Clocks
tRAS - 15 DRAM Clocks
tRRD - Auto
tRFC - 85 DRAM Clocks
tWR - Auto
tRTP - Auto
tRTW - Auto
tWTR_S - Auto
tWRT_D - Auto
tRTR_S - Auto
tRTR_D - Auto
tWTW_S - Auto
tWTW_D - Auto
tWTPD - Auto
tRTPD - Auto
tPTPD - Auto
tAPTAD - Auto
tAPTRD - Auto
DRAM Static Read Control - Auto
DRAM Read Training - Auto
MEM OC Charger - Enabled
AI Clock Twister - Auto
AI Transaction Booster - Auto
CPU Voltage - 1.55V
CPU GTL Reference - Auto
CPU PLL Voltage - 1.7V
FSB Termination Voltage - 1.4V
DRAM Voltage - 2.20
NB Voltage - 1.44
SB Voltage - 1.3V
PCIE Sata Voltage - 1.55V
Load-Line Calibration - Disabled
CPU Spread Spectrum - Disabled
PCIE Spread Spectrum - Disabled
CPU Clock Skew - Auto
CPU Margin Enhancement - Optimized


Thanks

[GSKILL TECH]

No, should not need to. Use DRAM Voltage 2.10V NB Voltage 1.40V.

tWR 8, tRFC 80

If you still have a problem, make sure you have the latest BIOS.

Thank you
GSKILL TECH

[EB1000]

Thanks

It did not work. I contacted Asus tech and they simply told me that it is not possible since this particular memory is not compatible with my MB when running 4 sticks. according to the MB QVL I can only run up to 2 sticks...

However, They said that 4 sticks can be run at DDR800 with lower timings. I tried DDR800 at 4-4-4-12 and it actually worked (passed 3 runs of memtest86+ and 12hours of Prime95)

Now I can live with that, But I do need some advice for other timing settings. With DDR800 and CAS 4-4-4-12, do I still need 2.1V DRAM and 1.40V NB running all 4 sticks? what about tRRD,tWTR,tWR,tRFC, should they be as recommended for 4 sticks at 1066, or can I tighten them up a bit?


Many thanks for the support

[Tradesman]

Can try lowering both, with the four sticks 2.1 for the DRAM is prob good, may be able to lower NB a hair, could try lowering about .01 at a time. The other timings should be good at auto.

[GSKILL TECH]

Typically at those settings it is DRAM Voltage 2.0V, NB Voltage 1.30V.

Thank you
GSKILL TECH