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Have just purchased 2x1 gb XMS2 6400 modules. Already had 2x1gb modules of the XMS2 6400 installed, stated was version 5.1 as are new modules. When I installed these 2 new modules computer would randomly close down in game giving no error message except once (and it said faulty ram). Ran Memtest86 with 4gb and found 32 errors.

Removed new ram and ran test again on older modules with no errors, removed this and placed 2 new modules in slots, to my surprise no errors, most confusing?? Machine only registers memtest864 faults when 4 modules installed?

I then put my sons 4x1 gb XMS2 6400 modules (but later ver 5.2) into my machine and ran memtest with no errors and no game crashes. Is there an issues with version 5.1.? Any ideas please

Operating System XP

Motherboard Asus P5K



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The on motherboard memory controller can not keep up with the extra DRAM at the rated speed. You will need to drop the speed of the DRAM. Some DRAM will show no errors but it is the luck of the draw. The DRAM is supported as a kit at PC 6400. When you add two kits, you change the dynamics. Most have to drop their DRAM speed. Some do not. Some of those who do not, will experience issues with stability in the longer term and then of those who do not drop their DRAM speed there are even fewer yet who will not experience problems in the short or long term.


Think of it this way. If you have a small phone book, then when you go into the index to find the page where you will find the phone number you are doing so at a certain speed due to the pages of the Index. Then you have to drive through the pages to get to the number. Now if your index is twice as large and the pages twice as many, then it takes longer to access the data. Now DRAM has a Strobe and the length of the strobe is how long the rows and columns can be left open before they must be refreshed. There is not enough time for the dram to be refreshed and then accessed with 4GB at the full access speed of the DRAM. The chipsets are optimized for 2GB, not 4GB and for 2 DRAM slots, not 4 DRAM slots populated. The motherboard manufacturers state that you can run a certain speed. They also state that you can run a certain storage capacity. ie 800Mhz and 8GB of DRAM. They do not state you can run that speed at that capacity when populating all four DRAM banks


Download Memtest from http://www.memtest.org. Burn the ISO as an image to CD.


Enter your BIOS and set to these values:


AI Overclocking: Manual

CPU Ratio Control: Auto

FSB Frequency: 266

PCI-E Frequency: 100

DRAM Command Rate: 2T

DRAM Frequency: 667

FSB Strap to Northbridge: 266

DRAM Timing Control: Manual


CAS# Latency: 5

RAS# to CAS# Delay: 5

RAS# Precharge: 5

RAS# Activate to Precharge: 15

TWR: Auto

TRFC: Auto

TWTR: Auto

TRRD: Auto

TRTP: Auto


DRAM Static Read Control: Disabled


Transaction Booster: Auto

Clock Over-Charging Mode: Auto


CPU Spread Spectrum: Enabled

PCIE Spread Spectrum:Enabled


CPU Voltage: Auto

CPU Voltage Reference: Auto

CPU Voltage Damper: Enabled

CPU PLL Voltage: Auto

DRAM Voltage: 2.1v

FSB Termination Voltage: Auto

North Bridge Voltage: 1.4

North Bridge Voltage Reference: Auto

South Bridge Voltage: Auto


Boot to the Memtest CD and allow for two full passes.



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Run SuperPi on both, that will give you a theoretical differentiation. Then leave the DRAM at 667 and test with the FSB Strap at 333Mhz. Retest with Memtest and SuperPi. Keep in mind that this is the FSB Strap, not the FSB. The FSB is still running at 333Mhz.



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Now you really are going technical on me..never heard of Superpi but found a download link. Think I am to set calculation at 4m but not sure? Will run all tests you suggest and let you know. I read on the web there is not a great difference though..again thanks matey


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