Hi, I just upgraded my machine from 2 to 4 GB main memory and now get bad crashes as soon as memory starts to fill up above the 2GB limit. A rather short run with memtest86 (1 hour) reveils no problems. System details: SuSE 9.2 Professional Stock kernel from kernel-smp-2.6.8-24.17 Tyan S2466 motherboard Original BIOS (can I get the version from Linux?) 2 AMD 1600+ CPUs (AthlonMP) 4*Kinston 1GB modules (KVR266X72RC25L/1G) Matrox 450 video card Soundblaster live audio Kernel says system has 3.7GB main memory, which is about as expected. It produces crashes in applications (gcc internal errors on code that compiles fine with only 2GB main memory) as well as kernel oopses and total freeze. My most important question is whether this is almost certainly a hardware problem or whether there are known problems with this kernel on this type of hardware and 4GB (system is rock-solid on 2GB). Any ideas? --- Jan