I recently purchased a ASUS M5A99FX-Pro R2 motherboard to use with my already purchased AMD phenom II X4 970. I am debating whether to upgrade my AMD cpu to a FX-8350 x8, or buy a new Intel motherboard (something like the ASUS P8Z77-V-PRO) and a Intel i5-3570k. After reading many reviews and benchmarks, I am under the impression that the 3570k out-performs most of the AMD cpu's. I plan on using my PC mainly for gaming, not video rendering. My current specs are:
Motherboard: ASUS M5A99FX-Pro R2
CPU: AMD phenom II X4 970
Graphics Card: NVIDIA gtx 560 ti (Asus) - hopefully to be upgraded to a 660 ti soon
Case: Thermaltake Armor Revo Gene White
Power Supply: Antek 650w
RAM: 12 gigs (2x2 gigs and 2x4 gigs)
Monitor: 27” 2ms Asus VK278Q
CPU cooler: Coolermaster Universal Hyper 212 EVO
You have a very good motherboard and an 8350 is the better option here. That board will help you max out the OC potential of an 8350.
I would personally OC the 970 and wait for Steam roller so that i get the maximum performance jump in AM3+ socket. 970 is a good quad chip and with a 660ti, you wont see any diff while playing, between it and a 3570K/8350 + 660ti.