I'm new to tech powerup but i have read the forums with my son who has been a member for a while and thats why i am here. I'm getting ready to go to windows7 64bit and i want to go to 8 gigs of ram. I have 4 gigs of g. skill ripjaw 2000 mghz but i can't find 4 more gigs anywhere. G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 ... I'm running a gigabyte p55a-ud3 mobo and an i7 860. There will be no over clocking so thats not the issue. The question is what would be better? Should i go to 1600, 1866, or 2133 mghz? I would go to the 2000 mghz ripjaw but like i said i just can't find it any where. The price for 8 gigs of those different speeds is minimal so thats not a problem. I just don't know what would be the best way to go. Any help or ideas would be much appreciated. Thank you!