hey, I just bought the apple 15in retina I hate its performance in games. im interested in a external gpu for my mac. id like to it run in the internal LCD. btw the gpu will work on windows 8 via boot camp right? im not sure just correct me if missed something or idk. AKiTIO Thunder2 PCIe box (270$) or Sonnet Echo Express SE II (500$) and why? GPU: EVGA 780 GTX 3GB (its the best gpu for that buck right?) EVGA 03G-P4-3784-KR G-SYNC Support GeForce GTX 780 3GB 384-Bit GDDR5 PCI Express 3.0 SLI Support Dual FTW w/ EVGA ACX Cooler Video Card - Newegg.com Power supply: EVGA supernova 750W EVGA SuperNOVA 750 B2 80 PLUS BRONZE Certified 750W Active PFC ATX12V v2.31/EPS 12V v2.91 5 Year Warranty 110-B2-0750-VR SLI Ready CrossFire Ready Modular NEW 4th Gen CPU Certified Intel 4th Gen Ready - Newegg.com thank you