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It isn't uncommon for the mid-range card of the next generation to have more shader power with less memory bandwidth than the high-end cards of the previous generation.
The 8600GT(G84) had more shader power than the 7900GTX(G71) but only a 128-bit memory bus, about half the memory bandwidth of the 7900GTX.
The 7600GT(G73) had more shader power than the 6800Ultra(NV45) but again only a 128-bit memory bus, about half the memory bandwidth of the 6800Ultra.
The HD4670 has the same shader power as the HD3870, but again only a 128-bit memory bus, about half the memory bandwidth of the HD3870.
The HD2600XT has a lot more shader power than the X1950XTX, but again only a 128-bit memory bus, about half the memory bandwidth.
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Rig1: System Specs.
Rig2: A8-5600K@4.4GHz / AsRock FM2A75 Pro4 / 8GB Corsair DDR3-1600 9-9-9-24 / HD7560D / Samsung DVD-Burner / 1.5TB WD Green + 3x3TB WD RED in RAID5
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