AMD Athlon X2 and 4 gigs of ram

Silly me to think that a 64 bit processor can address 4 gigs of ram but this reminds me of the old upper memory about 640k days in the 80s.

I got an ASUS A8N-SLI Premium motherboard that doesn't want to work with 4 GIGS of ram. Seems to work with 2 gigs just fine but put 4 gigs in and it crashes.

Ising Fedora Core 4 with 2.6.12 kernel.

nForce 4 chip set.
ram is 4 sticks of Kingston KHX3200/1GR

Crashes seem to happen with heave disk IO and error giberish indicates file system related stuff with sata_nv in there a lot.

So - what am I doing wrong? Is there a motherboard out there that alows an Athlon 64 X2 to talk to 4 gigs+ ram?

Trying to replace an older dual xeon box and I though it was going to be faster - but it doesn't seem to work at all.

 

 

 

 

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