Buying tomorrow (Athlon II 4x 620 or Phenom 2x BE 550/ 3x 720)

Gigabyte MA-790XT-UD4P = 860 EGP

Gigabyte MA-790FXT-UD5P = 1125 EGP

Either of those 2 boards. But if you're going to be using 2 video cards (or more) than the UD5P is the better choice. I was going to get that board until MSI came out with the 790FX-GD70. It has 2 full size PCI slots and 4 PCIe slots. And I liked the color scheme of the MSI board a lot more.

As for the CPU, what's your rig going to be used for? Primarily gaming? If so, then the 720BE is your best bet because of the L3 cache. I know you said you were going to try and unlock the L3 on the Athlon, you can't rely on that. Your expectation when buying any CPU that has locked components, whether it be a core or the L3, is that it WILL NOT unlock successfully. Don't get me wrong, if it does that's really awesome, but if it doesn't no loss.

But if you're going to be encoding I'd imagine that the extra core of the 620/630 would be more beneficial. However, I don't know how well the Athlons overclock. If they don't overclock well, then they lose their advantage.

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3.2 is pretty weak for gaming especially when using 2 or more GPU's. You need the processor speed to be able to keep up with them, 3.2 will not cut the mustard.

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Let me clarify. 3GHz is not fast enough to process all of the information packets 1 or 2 good GPU's put through. Hence this is known as a processor bottleneck. IMO, you need at least 3.5/3.6 to see cards like the 4870, 4890, 5770, 5850 etc. potential. Even in a single GPU configuration you need the high CPU speed for that and that alone, not that you need it to play a game.