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unstabile XMS TWINX2048-4000PT at 240+ mhz

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I cant get this kit stabile in my computer, when they hit around 240 mhz they start failing memtest86, 1000+ errors mainly on test5 but a few on the others too, i run them at 3-4-4-8 and 2.8v have tried 2.9 as well but same result


here are the memory settings on my DFI lanparty UT sli-dr expert:

CAS Latency (CL) 3T

RAS To CAS Delay (tRCD) 4T

RAS Precharge (tRP) 4T

RAS Active Time (tRAS) 8T

Row Cycle Time (tRC) 16T

Row Refresh Cycle Time (tRFC) 17T

Command Rate (CR) 1T

RAS To RAS Delay (tRRD) 2T

Write Recovery Time (tWR) 3T

Read To Write Delay (tRTW) 2T

Write To Read Delay (tWTR) 2T

Write CAS Latency (tWCL) 1T

Refresh Period (tREF) 200 MHz 15.6 us

DQS Skew Control Disabled

DRAM Drive Strength Weak

DRAM Data Drive Strength 3 (15% Reduction)

Max Async Latency 8 ns

Read Preamble Time 5.5 ns

Idle Cycle Limit 128

Dynamic Idle Cycle Counter Disabled

Read/Write Queue Bypass 16

Bypass Max 5

32-byte Granularity Disabled


i have tested the memory at 7x multi and 250 fsb = 1750 mhz so the cpu isnt even overclocked and they still fail, im beginning to wonder if i have some bad modules, or there are one of these settings the memory cant handle ?


the entire system is:

DFI Lanparty UT nF4 SLI-DR Expert

AMD Opteron 165 CCBWE 0604 TPMW stock cooler

2 GB Corsair TWINX1024-4000PT

Inno3d GForce 7900 GTX

2xWD Raptor 36gb - raid 0 on Nforce raid chip

2xWD 200 GB SATA - raid 0 on Sil raid chip

2xWD 200 GB SATA - raid 0 on Sil raid chip

Antech Truepower 2.0 550W

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Please make sure you have the latest BIOS installed for your MB (download the Beta version) and load optimized defaults settings, and try the following BIOS settings;

Genie BIOS/DRAM Configuration

DRAM Frequency Set: 2:1 or 400MHz or 200 (if option are 133/166/200)

Command per Clock: Disabled/Auto

SDRAM CAS Latency: 3T

SDRAM RAS to CAS Delay (tRCD): 4T

SDRAM Row Precharge (tRP): 4T

SDRAM Active to Precharge Delay (tRAS): 8T

And leave the rest at AUTO setting

Genie BIOS

FSB BUS Frequency: 250

LDT/FSB Frequency ratio: 3-4X

LDT Bus Transfer Width: 16 16

CPU/FSB Frequency ratio: Auto

PCI Ex: 100

K8 cool N’ quiet: Disable

CPU VID Start Up Value: 1.55 (Depends On CPU)

CPU VID Control: 1.55 (Depends On CPU)

CPU VID Special Control: Auto

Chipset Voltage Control: 1.6

DRAM Voltage Control: 2.8

All other settings are motherboards defaults

Then please test them one at a time with http://www.memtest.org and let’s make sure it's not some other issue! I would run the test for at least 2-3 passes to be sure!

These are settings we used on another DFI MB, but they should be close to your settings, just load setup defaults before you start. And if you still have problems, try the modules in the other two slots.

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im using bios NF4ED406 date :2006/04/06

i cant see anyone newer or a beta version on DFI's page for the expert board, so is that the bios you mean, just wanna be sure we are talking about the same, the other settings ill test tomorrow

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i have tested them now, one by one, one of them can go up to around 260-265 before failing the other one fails at 250 in test 5 and 8 in memtest86, it also failed at 245, didnt try any lower.

ill test them in a friends asus A8N-SLI deluxe one of the next days just to be sure.

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