Welcome to BarcelonaYou'll most likely have similar problems in 64-bit Windows as well. I was running 2k3 x64 R2 with my chips and had problems with memory detection as well. In my case, CpuZ saw all 8gb, but when I pulled the "drop down" menu to see which slots were populated, 4 out of the 8 slots showed memory inserted: 1gb in each slot. I was using 2gb sticks
You'll also notice that I was stuck @ 159mhz single channel.....
All chipsets aren't perfect upon release, but the Barcelona "compatible" chipsets are unusually bad. This may have to do with the fact that the prior socket F chipsets were designed with QuadCore AMD's already in mind. Chipsets were built according to AMD's guidelines which - in a perfect world - would have supported Barcelona as a "drop-in" upgrade. The reason C2D didn't have as many issues was due to the fact that the chipsets were designed SPECIFICALLY for that generation of cpu's and required users to purchase new mobo's -> something AMD wanted to avoid.
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