FX4300 and FX6300 vs Core i3 3220 (GTX670)
http://www.hardwarecanucks.com/foru...57615-amd-vishera-fx-6300-fx-4300-review.html
Not only FX6300 performing on par or better in gaming but it is much faster in Multithreding than Core i3 at the same price point. Its also unlocked and can be OCed to give it even greater performance to price ratio.
this graphics show the i3 winning in my opinion, the game with the lower framerate shows the i3 with 55 and the 6300 at 50 (and look at the i5 2400!)
in most of the other games is a tie, with the 6300 winning in SF4, but it's 180 vs 212...
"FX6300 faster even than 3570K" on Dirt 3 is laughable, that's a tie and probably GPU bound, many CPUs are within just a margin of error...
but at the end of the day the 6300 and the i3s are in the same level for gaming it seems, so you should decide based on cost, power usage and if you need a faster CPU for MT, want to overclock, and perhaps the FX 6300 will last longer being a decent CPU (because of the higher MT performance),
for around the same price I would go with the FX 6300...
as for 6100, it's harder to recommend, but if you plan on overclocking it might be a good choice, but then, you could also probably get a cheap 1155 MB and one of the lower I5 models like the 2400, depeding where you live you can find some good deals for these lower i5s, and save money on the MB/cooling since OC is less appealing for these non K i5s,
but then again with a 7750 any of these CPUs should do fine,
A8-5600K - I am actually running this with an HD 6850 (Went with the lowest price 4 core because I am not using IGP) Undervolted and rock stable at 4ghz. Picked this CPU up for $100 shipped. This is on my ITX setup and I am using a $17 Hyper TX3 Heatsink.
this one is the cheapest quad core trinity
http://www.scan.co.uk/products/amd-athlon-ii-x4-740-virgo-quad-core-s-fm2-32ghz-4mb-cache-65w-retail