It's not the bus, it's how you use it. An example is how your i7 930 has a 192-bit memory bus, but sandy bridge slaps it around. The 3820 has double the memory bus of the 2600k, but it actually loses some comparisons still. The HD 2900XT had a 512bit memory bus, but it lost horrifically to the 8800GTX with it's 384-bit bus.
Using only the memory bus to make your decision tells us you made your decision merely on the brand and decided it would be best to claim the memory bus as your reasoning behind it.
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