Hi,
I fixed the problem of "ram missing"
two weeks ago Tyan has provided a Thunder K8W BIOS upgrade for my mainboard.
version: 2.02
many new features are availlable...
playing with the one concerning the RAM the "missing RAM" reappears.
There is no lost (pci are disable in my case) and today i can use 6GB RAM.
that's all for this very good news