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kmixer.sys bluescreen

XP is supposed to be stable enough to run without bluescreens. But it wasn’t like that on my computer (AMD Athlon XP 3200+, 1 GB Twinmos Twister Pro). The CPU and RAM are all high-end equiment. The CPU was the fastest of its serie, the RAM has CL 2-2-2-5 and is still one of the best on the market. But still, my computer crashed with a bluescreen. The messages were IRQ_NOT_LESS_OR_EQUAL,
PAGE_FAULT_IN_NONPAGED_AREA or BAD_POOL_CALLER, usually telling me kmixer.sys was the bad file. The error is caused by my onboard sound card. I use it for Voip. What is the problem? PAGE_FAULT_IN_NONPAGED_AREA sounds like a RAM error. Dual-Channel could cause a lot of problem when mixed with the wrong chips, but mine were from a Dual-Channel-Kit and specially designed for it. I didn’t even overcloak them, even though it was offically allowed by the manufacturer. After days of searching for an answer, I finally solved the problem.

It wasn’t the RAM. It were the too uptodate NVidia drivers and an too low VCore voltage.

The problem usually happend when I was playing games, when the graphic card was very busy or when I was screaming “Kill that Onos! Kill that Onos, it ate me!” to Jonas through TS2. I tried to install the old drivers from the sound card. I found the “newest” drivers on the MSI Homepage dating 2004 which I installed over my 2006 official versions from Nvidia. By doing this, two bluescreen message were gone: IRQ_NOT_LESS_OR_EQUAL and BAD_POOL_CALLER. But my computer was still crashing with PAGE_FAULT_IN_NONPAGED_AREA. After some searching around, I found a clue on a forum. It was about graphic cards consuming way too much power. I didn’t even thought about that before because I just bought a new more powerful power supply. A little drop of the voltage for the CPU could easily cause the computer to crash, specially when I lowered the VCore voltage to let the CPU save power and be cooler. A wrong decission as you can see. I raised the Vcore voltage from 1,55V to 1,65V and my system was stable again.

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