Originally Posted by EniGma1987
More cores is only better in games that can use more cores. The 5800K is the same core design as the FX-6300, just without l3 cache. That cache only makes up for an average of ~5% performance difference so it is not even close to worth buying a whole new system. That 5800K will do just as well as an AM3+ processor would. The reason GPU usage could be low is not necessarily because the CPU is holding it back, but because of bad game design. I have both an FX-6300 and an i5 3570K and even with my i5 I have never seen 100% GPU usage on any game I have played in the past few years. And that is a 4.9GHz overclocked Ivy bridge, if that cant get there then a 6300 wont either.
Sorry, but the cache does account for more then a 5% descrepency in performance.
For some games it doesn't matter, but there are a ton out now and coming out soon where the cache does matter. The Llano APUs could get away without having the cache because they were made a certain way.
Which games have you played? Dirt 2 and 3, BF3, The Witcher 2, Metro 2033, Metro LL, Batman AC, Bioshock Infinite, Crysis 2/3 and many others should have no problem maxing out any single GPU setup as long as the CPU isn't holding it back.
Look it up, the CPU portion of the APU is slower than an i3 at stock in games, and marginally faster when overclocked to their limits. They also need way more voltage to get higher(4.4Ghz+) clocks then their AM3+ counterparts.
I have a 7870 and an a8-5600K, and I'm telling you it's not good enough from PERSONAL experience. I have no clue how you can argue something like that. It's basically the same setup as the OP.