MSI 845 Pro4 6391 problem with 512mb ram.

Configuration:
MSI 845 Pro4 6391 board
768 mb. PC133 sdram (3 x 256)
Gforce2 mx/mx 400, 64 mb.
Realtech PCI 10/100 ethernet
PCI modem, Generic SoftK56
Firewire controler, Texas Instruments
Maxtor 40GB and Maxtor 60 GB harddrives
DVD drive and CD-Rom burner.
Dual Boot - Win98/WinXP home
Problem:
With more that 512 mb ram, regardless of the which ram blocks or the size of these, certain programs refuse to run in either win98 (VCACHE is set to 512 mb) or winXP. A program may run under win98 but not under winXP and vice versa. The machine also seems to be a bit more unstable in general with more than 512 mb.
Both the board drivers and bios have been updated with the latest versions. Burnin tests have been run without showing any errors.
With 512 mb or less there are no problems.
Apart from the option that it is a known, but undokumented problem, (which a leading manufakturer like MSI wouldn´t be a part of, or would they) I have come to the conclusion that there is a fault in the motherboard.
Any suggestions or sollutions?

first some boards never seem to run 3 dimms in harmoney
second it is normally more likley to work if they are all same brand and size
third 98 can throw a wobbler with over 512 i assume thats the reg fix your referring to
my self i would not buy a third matching as i cannot put hand on heart and say that will 100 percent fix it
test report does not help at all as all were 64 dimmslink

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