This problem turned out to be a hardware fault/BIOS bug anyway. The Athlon 64 x2 939 devices can't support 4 DIMMs at 400MHz, only up to 2 (or 3). 4 devices needs to be slowed down to 333MHz. I expect this is due to excessive capacitance inside the chip.
The BIOS is supposed to be aware of these and slow down the memory if it detects 4 DIMMs, but my Gigabyte K8NS Ultra 939 isn't doing that. I overrode the settings and forced 333MHz and now it's stable. Weird fault. Hamish -- Hamish Moffatt VK3SB <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

