Possible bottlenecking somewhere?

[Intruder000]

Hi, I have recently just built my first system, however i was under the impression it would achieve a much higher performance than it actually is.
the specs are as follows.
Sapphire HD 6950 OC "Dual Fan Edition" 2048MB GDDR5 PCI-Express Graphics Card

AMD Bulldozer FX-4 Quad Core 4100 Black Edition 3.60Ghz (Socket AM3+) Processor -

Hitachi Deskstar 7K1000.C 1TB SATA-II 32MB Cache - OEM (0F10383) OcUK

Rage GT 700W PSU 80+ Dual Rail "80 Plus" Efficient Power Supply

Gigabyte GA-M68MT-S2 (AM3+) MicroATX Motherboard

Corsair XMS3 4GB (2x2GB) DDR3 PC3-10666C9 1333MHz Dual Channel Kit (TW3X4G1333C9A)

AEROCOOL Strike X PC Tower Case - Black/red (From different company)

I am still awaiting a blu ray drive (from a different company) but so far have 3 games installed. Call of duty 4 (runs perfectly) Duke nukem forever has severely reduced fps when the action hits. And Dirt showdown which runs at a staggering 14fps!
Is this normal? Am i missing something? From what i understand it should run perfectly? The only thing i can think of is the motherboard, is it possible for that to bottleneck the rest of the system? It is still under the 14 day returns policy so unless i get a solution it will be going back, so please suggest alternatives too
Thanks!

 

[Intruder000]

Thanks for responses, apologies for not replying sooner, been at work. As mentioned above my choices probably weren't the best, but my budget was restricted. Anyways 14fps in dirt showdown was whilst nothing in the background was running so there must be something else... Have all the latest drivers too.

Sounds like I should return most of it and spend some more pennies?

 

[Intruder000]

Anymore advice? From my understanding this setup should at least be able to play dirt showdown at more than 14fps?

 

[Intruder000]

As I mentioned I only have 3 games installed due to not having a optical drive as of yet. Call of duty 4 runs perfectly, Duke Nukem Forever FPS suffers badly when the action hits but is still playable...ish... And Dirt Showdown is just horrible at just under 15fps at max! Have reinstalled CPU/cooler just incase and still the same . So i guess that just leaves the PSU?