Those benchmarks are inaccurate. AMD processors run FAR cooler than any intel, even OC. Also, AMD Ghz. and Intel Ghz. are not the same exact thing, since AMD CPUs run more processes per clock than Intels do. This means a 3.0 Ghz. Intel is roughly equivilent to a 2.4 - 2.6 Ghz AMD, depending on the chip. That's why top of the line AMDs are only 2.8 - 3.0 Ghz. ,whereas top of the line Intels are 3.2 - 3.4 Ghz. In addition, not all games support dual core yet, and when you do play a game, you only utalize one of the CPUs cores. so a 2.2 Ghz Dual core will run at a straight 2.2 Ghz. Not really a signifigant gain unless you run several programs at a time. (and i know i don't) Plus, there are still plenty of good single core chips out there.
Like this for example : AMD 64 FX 2.8 Ghz stock
Why OC a 2.2 Ghz to 2.8 when you can OC a 2.8 Ghz to upwards of 3 without breaking a sweat. Still a bit pricy though.
Anyway, just make sure you mobos sockets and ram slots match up. Also, I HIGHLY recommend you get the same PC ram as you mobo suggests. Corsair is almost always a safe bet for any mobo. Also, DO NOT BUY THIS
MOTHERBOARD. The northbridge fan is very noisy, and it goes out after a couple of months in about 90% of the people who bought it. This is a big problem. Remember when reading newegg reviews to look at how long the person has owned the product.
Thats all for now, and good luck with that build....