4870 1GB Crossfire Problems

Sorry to post another Crossfire / SLI problem but I haven't been able to get a solution from 2 other forums.

My system specs:

Core 2 Quad 8300 2.5ghz
2x2GB (4GB) 1066mhz Corsair Dominator
750GB Samsung HDD
DFI Lanparty DK Plus mobo (p45)


I've owned a 4870 1GB from Powercolor up until now as I've just recently purchased a Sapphire 4870 1GB and plan to put them in CrossFire.

Here's a basic timeline of what happened:

-Installed the GPU, 2 CrossFire bridges used to connect cards.
-Let Vista 64-bit install the card
-Noticed card isn't able to be CrossFire'd in CCC <it was greyed out>
-Checked bridges and turned out I hadn't plugged them properly on.
-Plugged them in properly; option still greyed out.
-Used the install disc attached to install the drivers, etc.
-CCC now allowed the Enable CrossFireX box to be ticked but it wouldn't stay that way, it would simply disregard me pressing Apply and Ok.
-Downloaded CCC 9.6 & drivers that accompany it.
<<Now it get's wierd>>
-CrossFireX is able to be enabled and so I enable it and it stays, etc, all seems good.
-Do the Crysis Benchmark; no increase in performance.
-Check GPU usage via Rivatuner's Hardware Monitoring feature whilst playing Crysis, FSX, Wings Over Europe, UT3, the second GPU doesn't do anything  

GPU-Z, etc says the CrossFire is working <well actually it says its working but unsure for Vista 64 bit> but the card doesn't actually contribute to anything other than increasing temperatures from 54 to 80C on the original card.