Half Life

Actually, for the moment only have one ram stick on slot A1, and last night I change it to B1 and ran P95 on memory blend arround 4+ hours and no problems. Today I'll run P95 for more time and at the night I'll play to check. I hope it's just that if you use only one stick that you need to place in slot B1, because the manual only indicated the slots than you must use if you have two or four sticks.
 
I change the speakers for a headset and the buzzing gone, the buzzing only hear when I use my USB speakers, I'll clean the CMOS and at the afternoon post the feedback. 
 

Not exactly, some blocks have more performance (capacity dissipate heat) depending of the material of the base plate, the microchannels, the top, and other factors.

7870, 7950 or 660 Ti--whichever can fit in your budget depending on sales.
 
I'm pretty sure the 760 won't fit in his budget.

Well, usually i would agree with you Pixxie, but he is planning on getting the second card a few months later, so going dual will be more viable than waiting 3-4 months for the money to get the better single card solution.