Its not really feasible. PCI slots are so incredibly slow that even if u managed to get a decent card in there, it would be held back.
however, i do believe that there is a PCI FX 5600 somewhere out there if u want to try.
-AMD Athlon 64 3200+ Winchestor
-MSI K8N Neo4-F
-Sapphire Radeon X850 XT
-2x 1024 Corsair XMS Pro
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