Gladiator Warbird Upgrade?

[Skedly]

Was just wondering if the ATI Radeo HD 6870
(https://www.aria.co.uk/Products/Components/Graphics+Cards/ATI/ATI+6800+Series+/Sapphire+ATI+Radeon+HD+6870+Vapour-X+1024MB+GDDR5+PCI-Express+Graphics+Card+with+FREE+DIRT3+Game+%5B1117 9-07-40G%5D+?productId=46266)

was better or worse than the stock Graphics card in the Gladiator Warbird (https://www.aria.co.uk/Systems/Gaming+Range/Gladiator/Gladiator+Warbird+H20+Intel+Core+i5-2500K+3.30GHz+%40+4.50GHz+DDR3+Gaming+PC+?productI d=45770)

Also would it still fit in the case and be compatible?

Thanks :D

[Richo]

The GTX 560Ti OC should out perform the HD 6870. It would fit and be compatible. I would stick with the 560Ti though. You need to go up to an ATI 6950 to be comparable to a 560Ti.