GPU update for Gigabyte 945p-ds3 motherboard

[sniper7137]

I'm planning to buy a new GPU for my aged motherboard (its last BIOS update was in 2008).
It supports pci-e 1.1 x16. Its supposed to carry me over until I get a completely new system. Could anyone give me a suggestion for a DX11.1 graphics card that could run fine with this board.
I thought about an amd7770 but people have reported trouble getting it to run on pcie 1.1 supporting boards.
Ideally I want a card that could run games like AC4, upcoming AC5, Crysis 3 at medium to high settings @720p without being overly power hungry.

Any suggestions?

 

[Outlander_04]

The 7770 or R7 260 should be fine on your motherboard

They are the strongest card you should consider

 

[sniper7137]

The 7770 or R7 260 should be fine on your motherboard

They are the strongest card you should consider

But are you positive that there will be no issues with the 1.1 pci-e port? I've heard that new AMD cards in particular have compatibility issues with it...

 

[Outlander_04]

They have no such issues