As for running the HD7750 without thePCI-e power connector at the same speeds the factory over clocked one's with a power connector they will run at 900mhz instead of the stock 800 MHz without adding any voltage at all. The 620 is a junk card if you plan on doing any gaming whatsoever. As for pixel pushing power the 620gt can push 11.2Gigatexel's a sec vs the hd7750's 28.8Gigatexel's a sec. Nvidia a 620gt is built on 40nm compared to the 7750's 28nm using 44 watts vs 55 watts for the 7750, the 620 gt only comes with 64bit wide ddr3 memory giving it 8.6GBs vs the 7750s 70+GBs thanks to its 128 bit gddr5 memory. I Highly doubt it but it also comes in a low profile Format, but both take up 1 slot but the heatsink and fans take up slightly over 1 slot. They cost around 80-90$, but it comes equipped with a Arctic Cooling heatsink and fan so it is very very quiet, even with with the fan at 6000rpm it is surprisingly quiet! Under normal operation it it silent. I cannot say it enough get a HIS icooler HD 7750 with 1GB gddr5.
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