This is to rest many minds out there about the Z600 Revision 1 ending in 002, You can only run 1 5660 2.8GHZ Six core processor, Not 2. It works flawless as I type this article, If you want a dual setup you are better just buying 5550 or 5570 processors. I ended up purchasing C2 revision motherboard on ebay for 48 dollars and a 24GB memory kit. Now I don't have to sell my entire pc. Don't waste your time modding or trying to figure out how to get those 5600 processors to work in dual configuration it will not work, 1 works for sure, but for the price of the 5600s it is worth just buying a C2 revision board to get the highest clock possible, because you cannot overclock the Z600s. Note: The only thing expensive these days are the factory cpu heatsinks 40.00 dollars for one is a lot when you can get 2 5675 for 80.00 or best offer. The Z600 are a beast, I tried to save money for the Z800 which has a better offering. For the videocard option for the Z600, I am going with a Pny gtx 1070 which has 1 8 pin connector. Or just go with a GTX 1060 3GB version with 1 6 pin low powered. All problems solve. It was a headache to get info on the Z600. Just get straight to the point. See Ya