After changing new motherboard, my windows xp have became unstable. All in the sudden, blue screen ( with DRIVER_IRQL_NOT_LESS_OR_EQUAL msg) will pop up. I have checked both of my Kingston DDR400 512mb (Two Modules) with software and seem the Ram are doing fine. I have found that if I inside two RAMS ( total 1gb ) , the blue screen will come out. But if I only use one RAM ( 512mb ) then nothing happen. I am wondering is it i need to manually setup in BIOS.
The sticker on the ram wrong 2.6v, but the manual of my mother board wrote 2.5v, is this the problem?
Details: Rams 2 x 512mb Kingston DDR400
Mother Board P4M800-M - support DDR400/333/266 memory types - accomodates two unbuffered 2.5v 184pin DIMM sockets - a total of max capacity of 2 GB
With unbuffered RAM, it is quite possible to have problems as you add memory sticks. The more sticks, the greater the drive requirement on the CPU address/data lines. This can cause signal margins to degrade to the point where data is corrupted during transfer. The problem is the rounding-off of signal edges as the load is increased.
Check the motherboard manufacturer's website, and make sure your RAM is on the list of qualified products. Also, see if there is a bulletin about this problem.
A motherboard I bought recently has this problem. I haven't experienced it, because I have only 2 RAM sticks. There is a bulletin out from the motherboard manufacturer which says you have to derate the RAM to DDR333 if you install 4 sticks. (It is dual-channel, so installed in pairs.) This, despite the fact that the specification and marketing materials say DDR400.