GTX660 or better are plug and play in a 2570P as are GTX460/GTX560/570/580. AMD, GTX650/GTX750 or older NVidia cards are problematic as they require a 256MB contiguous pcie config space, which the bios does not provide. Those need a DSDT override and (maybe) Setup 1.x, extra software configuration to get all running. GTX670 is a great card. There is a momentum to bundle eGPU adapters with 220W AC adapters. If wanting then to keep under 220W would mean anything up to a GTX680/GTX760 can be accomo
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