7970 not performing as expected

I purchased an AMD 7970 on monday as an upgrade from my 6870, and it doesn't seem to be running as I expected. In some games, such as Deus Ex I can get 90-130 FPS with v-sync switched off, but in others, such as GTA IV I am getting between 35-45fps. Some games ran at a steady 60fps with my 6870 and now run between 45-60fps on my 7970 (Battlefield bad company 2) Could it be a problem with my card or is it likely to be a bottleneck of some kind. My current rig is as follows:

Motherboard: Asus M4A79XTD Evo (GPU PCI slow is 2.0 and 7970 is a pci 3.0 card, but I read extensively that it makes no difference if its 2.0 or 3.0)
PSU: OCZ Fatal1ty 750W modular
CPU: AMD Phenom II 965 (3.4Ghz)
RAM: Kingston HyperX blue (1333mhz)
HDD: Western Digital Caviar 500gb 7000rpm
SSD: 120GB OCZ Agility 3
GPU: PowerColor 7970 (not stock version, has 2 fans instead of the normal long case with 1 fan. Was running 12.4 drivers but heard they had problems and experienced low FPS myself so went onto 12.6 beta drivers)

Any thoughts as to what it could be? I shouldn't be getting less FPS than I previously was, it's rather strange...
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More about 7970 performing expected
  1. Your cpu is not doing justice to that card.OC it.
  2. You need to get that CPU to 4.0 GHz at least (assuming you have the know-how and a good enough motherboard & aftermarket CPU heatsink to do it). Even then, it will bottleneck a 7970 in some games.
  3. Cheers everyone! I rolled back to 12.3 and still having problems with FPS. I also tried OCing my CPU to 3.8Ghz (highest it would go and still be stable) but no luck. I think it's time I upgrade to a new CPU, gonna go for the i7 3700k 3.5Ghz. Just trying to find a motherboard that supports the 7970 and i7. On a bit of a tight budget as I have been sinking rather a lot of my wages into this system, haha. So far found http://www.ebuyer.com/281367-asus-p8z68-v-lx-socket-1155-onboard-graphics-output-8-channel-audio-atx-p8z68-v-lx and http://www.ebuyer.com/345353-msi-z77a-g43-z77-socket-1155-8-channel-hd-audio-atx-motherboard-z77a-g43 I cant find documentation that states that these two motherboards support the 3GB of RAM onboard the 7970 GPU. Anyone got any idea if they work?
  4. They both support it but I'd go for the second one, as Ivy Bridge CPUs are not guaranteed to work with z68 boards without BIOS update. And you need another CPU to update it.
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