Hello, I need some advice, I'm reading forums since 2 days trying to find out a solution to my question. I have a MacPro 1,1 upgraded with 2 x 2,99 GHz Quad-Core Intel Xeon Rom Revision: MP31.006C.B05 SMC Version: 1.7f10 9 Go 667 MHz DDR2 FB-DIMM ATI Radeon HD 5770 1024 Mo OSX 10.8.5 - Chameleon boot on SSD because of some games not working fluently I'm wondering if by replacing my HD 5770 I will get better results. The answer is apparently yes which is In this forum I found that for MacPro 1,1 I should go for a GTX 570. in another one someone told me to go for a 770 .... Well to be honest I'm quite lost, and do not know which card will be the best. Few models are also available on the market, some noisy others not ... which one to select ? If someone can help that will be very much appreciated. Thanks.