I have been reading up on the 'slow CPU fast GPU' situation on the net as well as the Phenom II X4. It appears that a modern GPU will independently function well enough (not 100%) even if the CPU and the chipset architecture is slow so long as the CPU is not below the minimum req of the application/game.
So, to me getting a Phenom II X4 955BE and another 2GB RAM sounds more then enough.. It will cost me less then 8K and with a new gfx card I believe the system will be able to play even Crysis 2 handsomely. Perhaps not @ Extreme settings as that seems to require a X6 core (can someone confirm?).
The reason for this is, by just spending 8K I will be give new life to my system. It is cheap, it is easy and it provides me with more time to wait and get the next top class CPU/Mobo. So why should I spend a lot more on a new platform like the i7 at the moment.
Sure the PCIe will run on 1.0x (the gfx card would have to fall back and yes they are backward compatible) and the HTT will be limited and the RAM will be a bottleneck (DDR2) but I should be able to get atleast 80% performance in comparison to a DDR3/PCIe 2.0/Z68-P67Mobo. A Phenom II 4 Core 3Ghx+ CPU should easily satisfy any games in the mean time.
Even so I will only get the GFX card first and benchmark to see how big a bottleneck the existing X2 4400+ is. I dont expect it to be a bottleneck enough to have a detrimental effect except for extreme games like crysis 2. And dont forget the extreme OC potential of AMD cpus. I can push the limits as well, since I am not worried about burning out the CPU as it doesnt have much of a resale value. If that happens I will get the Phenom II X4. It will be unimaginably cool to burn out a CPU though
I have been able to OC from 2.3 Ghz to about 2.9 Ghz (in the vicinity of a X2 6000+) earlier without much temps (I have an airy cabinet
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Sorry for all the crazy analysis but I want to squeeze the last drops of clock cycles from my PC. I love it.