the 8120 will walk all over the Q6660 it will use twice the power of i7 and be 30% slower then a i7 but it will walk all over a 775 chip I recently build a budget core i5 and R7 265x and it blows the amd chips out of the water for about 100 dollars more and the difference in power consumption will more then account for that eventually
don't get me wrong its fine to settle for a AMD chip hell in the majority of cases you won't see any difference
At stock clocks that's true for sure since the Q6600 only has 2.4GHz and a low FSB of 266MHz (so even DDR2-533 or 667 memory is fast enough and higher speed memory or DDR3 would make no difference). The 8120 has 3.1GHz and a Turbo up to 4.0 (!) GHz with no FSB since the memory controller is in the CPU and it does support (and even makes some good use of) DDR3-1866 RAM.
Then the 8120 has 8 threads it can process, so (and that's the thing with these FX CPUs anyway) it HEAVILY depends on the program how good it utilizes the FX (bulldozer) architecture.
BUT if the Q6600 is overclocked to 3.6GHz+ the FX8120 @ stock will not always be faster, especially at programs that only make use of one or two threads and/or are older and not optimized for that FX in any way. But then again that FX8120 can be overclocked too, but you need a decent board and cooling for that, and also depending on your GPU a decent power supply since that FX needs some power when overclocked (but the Q6600 needs a lot too if overclocked and at higher VCore)
Anyway I am very interested in scores that Shambles1980 will post, but for "real life" tests he only used Thief. 3DMark at least shows what theoretically the CPU/GPU combo is capable of. Most of the games will be a different pair of shoes anyway.
@Delta6326
You have that Q6600 of yours at stock? Really?
You have a good board that should overclock great, a (way too) strong PSU, a decent cooler and then you even throw that HD7870 at that poor CPU.
At least set your FSB to 333MHz to get 3.0GHz out of that Q6600. If it is a G0 revision it may work at this setting even with default VCore or maybe a little more. Oh and remember that you do NOT want to leave most of the voltage setting on AUTO (so the board raises these values as it likes) when you overclock since these ASUS boards tend to use way more voltage on AUTO than what is required.
If that CPU needs a higher VCore to be stable you might want to enable LLC (loadline calibration). With that you will have only a small VDroop (difference between the VCore voltage between IDLE and LOAD) so that you maybe even can lower that VCore a little but the system will need more power and produce more heat under LOAD.
@HalfAHerz
Yes that's a big plus for AMD. You can get a pretty decent FX-8320 NEW for about 116 EUR (about 158 USD) here where I live. At least that used to be a good offer about a year ago (was ~ 130 EUR back then) but Intel wasn't sleeping and their Haswell CPUs are about 10-15% faster than their Ivy Bridge CPUs.
Also a FX-6300 for about 86 EUR (about 117 USD) is a good offer.
Intel CPUs always were a little more expensive, at least if you wanted a bigger CPU or one that can be overclocked.
The crazy thing is that Intel kind of really can price their performance and high end CPUs almost to anything they want. That started right after the launch of the Sandy Bridge CPUs. The i5-2500K dropped right after it's release in early 2011 to below 170 EUR (that about 232 USD) and in early 2012 it went up again to 190-200 EUR!!! (about 260-270 USD) right before the release of the i5-3570K that was sold for about 215 EUR (about 293 USD) and this price held up to mid 2013 right before the Haswell CPUs were released.
It seems like Intel does not see a reason to drop it's prices.
About that frequency thing ... check out some reviews about the FX-9590. As you surely know that's just a overclocked FX-83xx and that almost all of these can be clocked to ~ 4.8 GHz and even some more. But still at these clocks they often are slower than a i5-4670K @ stock and that's sad. But in some tests they really shine, but most of them are applications like crypting/decrypting/packing/converting aso. and in games the i5 usually is faster.