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XMS4000PT TwinX Failing


jonnygrunge

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Last week I was running Nero Vision 4 to recode an avi file onto DVD. When Nero finished, and I exited the program I got a BSOD complaining of a stop 1d memory fault, anyway I rebooted and got another BSOD page_fault_in_non_paged_area. I ran system restore and recovered the system registry! Suspecting the RAM I downloaded memtest86+ and ran it. It was ok for 5 passes but I have had around 372 fails on test 8, writing all F's but reading back FFFFFFFB or all F's D, alerting there could be a fault with data 2, and or data 1, as it read back 1011 instead of 1111, and 1101 instead of 1111. I have run several tests now I set my RAM to 480Mhz and it was error free for 12 hours on test #8. I have had my CPU running at 2.64GHz (240*11) at stock speed (2.2GHz), and at 2.4GHz (240*10) it still passed error free for 8 hours, with the RAM at 480MHz. It seems that if I go above 240Mhz (480Mhz DDR) the RAM fails! This does not make sense as it is rated at 500MHz Cas 3 @ 2.75V. It definately is the memory and not the controller integrated into the CPU. Can you please advise.

Thanks in advance,

Jon Mackie.

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I would lower the multiplier to 8 or 9 and see if the results change and also try and add a bit of voltage to the CPU and Chipset if you have not done so, but I would try and test the modules one at a time and see if one is failing. but from what you have posted I would suspect its the system will just not support these settings. Errors in test 5,6,7 and 8 would suggest some other problem.
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Yeah I have tried upping the voltage slightly (North Bridge and CPU) also I changed the multiplier to 9 - No change! My CPU (X2 4400+) is a good one, CCBIE stepping!, it reaches 2.7GHz no problem at stock voltage (1.35V) system is stable, adjusting the voltages only adds to more heat generation (around 10oC), which is no good as I'm air cooling!. I can get the RAM to run at 590MHz DDR, (passed memtest86+ for 14 hours) so my loss in memory bandwidth is negligible! HTT is running at 980Mhz. It would have been nice to have all the clocks at a nice round number, but hey ho! Could be the chipset itself though, the neo2 (nForce3 Ultra) is getting on a bit, age wise!, and the Mobo only officially supports DDR 400MHz RAM, dunno what the integrated memory controller in the X2 supports up to data transfer wise, with regards to RAM. Thanks for the quick response Ram Guy! If you have any other ideas though, can you please enlighten me!
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