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computer POSTs, but reboots as soon as i start installing an OS


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sorry for the crosspost, but i haven't received a response in the compatibility questions forum and i'm not sure which forum is the right place.


i've had some Corsair RAM for a little more than 2 years now, never had much of a problem. a few days ago, i bought some new processors, and bam, i'm having RAM issues, and i can't figure it out. do i need to buy new RAM? do i need to change my BIOS settings?


i've tried running memtest, and when I have ECC turned on, it reboots immediately. when i have it turned off, the tests fail pretty quickly (it doesn't seem to get all the way through), and i KNOW that ECC needs to be turned on for this mobo.


here are the relevant system specs:

MSI K8T Master2 motherboard

2 Opteron 248 processors

Corsair XMS 1GB (2 x 512MB) 184-Pin DDR SDRAM DDR 400 (PC 3200) ECC Registered Dual Channel TWINX1024RE-3200LLPT


the processors are an upgrade from a single 242 processor.


as far as BIOS settings are concerned, everything is pretty standard for these processors, and my motherboard doesn't really give many options.


RAM frequency: 200 MHz

RAM voltage: auto (i can choose somewhere between 2.5V and 2.65V in 0.05 increments)

Chip-Kill ECC mode: enabled

DDR timing: auto [CAS latency: 2.0]


CPU clock ratio: 11x (standard for these processors)

CPU voltage: 1.5V (again, standard)

Auto-detect PCI Clock: enabled

Spread spectrum: enabled

CPU clock: 200 MHz


i bought the RAM from Newegg in july of 2004, i'm not sure what my warranty options are, if any; i'm not even convinced that the RAM is bad, but i'm unaware of any kind of compatibility issues here, especially any that would be created by introducing processors that are only a little better than the one i had before.


please, any and all suggestions are helpful; i'm also kind of looking for a "final word" by someone smart at Corsair (or anywhere) that can put a definitive stamp on this issue. or ANYBODY who knows more than i do, really.

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With the new CPU installed please reset the bios and then load setup defaults and set the settings needed for your specific modules and then test the system with http://www.memtest.org.


yep, did that- i had BIOS v1.1 to start with, but upgraded to v1.35 and set it to safe defaults. This turned ECC off; memtest failed with ECC turned off, and wouldn't even run (computer would reboot) with ECC turned on.

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  • Corsair Employees

ECC should be enable with these modules, but it should run with out it as well.

Let's get them both replaced. Please use the RMA request found in TSXpress or follow the link in my signature “I think I have a bad part!” and we will be happy to replace them or it! And please note that you are from the forum!

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