Upgrade help

[Gromet]

Hi all,
thinking of upgradng my trusty old 5850 1gb gfx card.

After some pointers.

7870?
http://www.overclockers.co.uk/showproduct.php?prodid=GX-296-SP&groupid=701&catid=56&subcat=411

or

7950?
http://www.overclockers.co.uk/showproduct.php?prodid=GX-065-HS&groupid=701&catid=56&subcat=1673

Current rig
i7 930 2.8GHz
Not entirely sure what motherboard i have, it was bought as a 'Titan Goliath' bundle 2 years back.
I'm 99% sure it only supports PCI-e 2.0/2.1 though, and this is my concern.

Will the 7950 run on a PCIe 2.1 board?
Will I see any benefit over the 7870 running the 7950 on a board that doesn't support PCIe 3.0?

any help appreciated

Grom

 

[Gromet]

thanks for the information guys
if my cc allows it i'll put an order in for that 7950 this evening