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The FPS increase would range from about 15% to 50% over what you have now if you were to get a 7770 and the 6870 would offer a similar increase again over the 7770. CoD and WoW can tend to be CPU bottlenecked games. But assuming with your overclock that your bottleneck doesn't prevent 60FPS average then the 6870 would be the way to go. At that resolution and max settings in either of those games your average FPS would be a bit over 60 with the 6870 and a bit under with the 7770.
As for voltage issues are you measuring these yourself or are they reported by the motherbord? If it's just what you see in something like HWMonitor it's less of a worry than if you were to measure a significant drop yourself.
A little more OC(if possible) and either of those graphics cards are a great matchup, especially for what you described.
@ Subpar. When a very broad question is posed in a forum with other users that have many varied systems you will always get the most basic down to earth answers. At first almost like throw the whole thing away and start over. While not a bad answer either, it is an expensive answer.
I note that you have an R 2.0 board which means it is pretty newly purchased and would hesitate to tell you to ditch it. What I would say is that it is really only good for a 4 Core FX processor. It does NOT have the voltage regulation circuititry that is robust enough to handle even an FX 6 core and most certainly not an 8 core At stock but you are alread overclocking. what you have and would continue to do so even if you upgrade to more cores. To run more cores and to overclock with that board would be an exercise in futility in the long run. FYI.
Get a more robust video card and see if you can reach 4.4 Ghz without having to add a bunch of Vcore. Often that jump to hit 4.5Ghz is just the break-over point where you really have to ADD Vcore. So staying below the steps of cpu speed that require the 'next' hefty Vcore increase can make sense when cooling with air. FYI.
Good fortune to you and seems you are liking your rig pretty good for the games you play. In the end that maybe what matters more than what we collectively think you need to do for more performance. I can hear it now >>>>> Video card here I come.
RGone...ster.___________________
Rgone, I think he may be in need of a little fsb, ht, cpu/nb work to improve his system.
SubPar, I cannot find what you have Vcore set to in the bios itself. I see what HWMon and CPUz > CPU Tab show but not what you really have Bios CPU voltage set. What ever it is up it 0.025 if that small amount is allowed in bios setting.
Then go and move FSB/Cpu Frequency to 210 from 200.
1. This should raise Cpu Mhz to 4410Mhz.
2. This should raise Cpu-NB some as well but should not hurt. As a caution you might raise the Cpu_NB voltage to 1.225 to allow for raising the Cpu_NB.
3. This should also raise the ram speed to DDR1680. With my ram this little ram overclock is nothing to it. Does it with ease. I make sure my ram voltage is always set to 1.55V for added stability insurance anyway. Not sure about your Kingston though.
4. This will also raise your HT Frequency as well by the same amount as CPU_NB is raised so should not be an issue and no voltage need be adjusted.
Now run P95 Blend mode for at least 20 mins with HWmonitor logging and if you have no failures or computer does not reboot or temps do not go more than 70c on the CPU Temp and no more than 60c on the Cpu Core Temps, then I would run for 2 hours and that two hours should give a pretty good idea your new 4400Mhz aka 4.4Ghz is stable and go get that video card.
I am looking now thru the power supplies by the brand name that I would consider. Will have to post that later. RGone...
"SubPar" two things:
1. What in hale sort of anomoly was that Max CPU Vcore of 2.82Volts? I don't lay that off strictly to a software glitch. The VRM circuit on that board is not the most awesome. It might have thrown a high voltage spike for a split part of a second and HWMonitor 'tried' to record it and missed or maybe hit as the case might be. I would watch that Max Vcore since the LLC was strange on those non-R2.0 mobos.
2. Be nice to see the CPUz capture of the CPU Tab and the Memory Tab since we are not just multiplier clocking but also FSB clocking which drives all the other buss related speeds up as well. RGone...
EDIT:
Well crap I looked again at HWMonitor and saw that 1.15 Min voltage for the +12V rail of the power supply and also the Vin7 and Vin8 which have all thrown pretty large "flyers" of voltage. I wonder if the +12V rail of that power supply is wonky?
END EDIT.