Quote:
Originally Posted by ICDP
I am running the following system
i7 2600K running at 4.7 HGz
2x HD6970 in Crossfire (AMD 11.6)
16GB DDR3 1866MHz RAM
Asus P8 Z68-V Pro Motherboard
Asus Xonar DX Soundcard
OCZ 60GB SSD (OS)
120GB Samsung SSD (Games)
Corsair HX 750W ATX Modular PSU
Windows 7 64 Pro
I upgraded from a i7 920 Clocked at 3.8GHz with 12GB DDR3 1600 RAM. The difference in FPS with Cliffs of Dover (and most of my other games) compared to my new system above was totally non-existant. Neither of these two systems were remotely being bottlenecked by the CPU.
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If it didn't make a difference in GPU utilization, then the bottleneck lies somewhere else. I then would opt for the PCIE bridge or it's still a problem with the support of crossfire itself (which wouldn't be that strange).
I've also upgraded from a AMD Atlon II X4 640 @ 3,4 processor. With my old processor I had on average a GPU utilization of about 50% with peaks just above 70%. With my new CPU I finally reached peaks of 100% GPU utilization and had a FPS improvement of about 30%. And even now I can get better average utilization by overclocking some more, but then I will have cooling problems with my current CPU fan.
I also had a performance increase by overclocking the PCIE bridge with only one 6970. Two of those cards would in theory require double the amount of bandwidth. But I should warn you about the risks of over clocking your PCIE bridge because it can bring great risk (especially data corruption on your hard drive(s)!!!).