Card Upgrade Conundrum, Size and Spec.

[paulspot]

I'm about to upgrade my graphics card from an NVIDIA GeForce GTX295. The three most important bits of my spec are:

Motherboard: Gigabyte EX58-UD5
Case: Antec 300
Power Supply: Corsair 750W

I'm looking at either:

1. Gigabyte GeForce GTX 780 WindForce 3x OC Rev2.0 3072MB GDDR5 PCI-Express Graphics Card.

at http://www.overclockers.co.uk/showproduct.php?prodid=GX-114-GI&groupid=701&catid=1914&subcat=1341

or

2. Gigabyte GeForce GTX 770 WindForce 3x OC 4096MB GDDR5 PCI-Express Graphics Card.

at http://www.overclockers.co.uk/showproduct.php?prodid=GX-117-GI&groupid=701&catid=1914&subcat=1750

Will both physically fit into my case and are they both compatible with my motherboard?

I understand the PCIe 3.0 is back compatible with 2.0.

Many thanks in advance for your time.

Paul.

 

[Grassy]

Power supply - Yes
Case - Can't be certain but i would say yes
Motherboard - should work as the card is PCIe

Which one i would go for? 780