Trouble with Asus SK8V MB with more than 2048M memory

I can't use more than 2048M of memory in my test machine. 

The machine has AMD Athlon 64 FX with 4096 M of
physical RAM with Asus' SK8V Motherboard.

I use two 2048M modules, Kingston's KVR266X72RC25/2G.

I can't install FC5 x86-64 or any 64-bit Linux on the system without giving the parameter "linux mem=2048M" while installing.

If I give for example "linux mem=4096M" or no mem parameter the installation hangs allmost immediately. While launching  installed system with bigger mem I have a kernel panic immediately.

The curious thing is that with Windows XP Professional x64-edition and 64-bit Sun Solaris the whole memory space is available. So there can't be any serious hardware or configuration problem in the machine.

Before touching to the hw configuration, I would like to understand the problem better. I have had the same problem with Gentoo, where I tried to solve this problem by recompiling the kernel. I was unable to solve the problem that way. 

Has anybody been able to install Linux or FC5 x86-64 on that motherboard with more than 2048M of memory?


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