no, its not
memory doesnt affect the performance much at all. most games barely use 128mb of mem anyway, let alone 256. pipelines, core speeds, and mem speeds are much more important. besides, its been proven that unless its a bleeding edge card (i.e. 6800 Ultra/7800 GTX/Radeon X850 XT PE), more than 128MB of mem is just marketing. in fact, the 128MB 9800 pro outperformed its 256MB cousin
-AMD Athlon 64 3200+ Winchestor
-MSI K8N Neo4-F
-Sapphire Radeon X850 XT
-2x 1024 Corsair XMS Pro
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