Is my graphics card compatible with my computer?

[sleepinxonxbed]

I just purchased a Sapphire Radon HD 7770 (http://www.newegg.com/Product/Product.aspx?Item=N82E16814202084) graphics card to upgrade from my XFX Radeon HD 5570 card and now my computer is slower than before. Games have dipped to 10-20 FPS on low/medium settings, typing is slower, even dragging and selecting icons on the desktop is slow.

My specs are:
Motherboard: Gigabyte Ultra Durable 3 model GA-870A-UD3
Processor: AMD Phenom(tm) II X4 840 Processor
OS: Microsoft Windows 7 Ultimate Edition (build 7600), 64-bit
BIOS: Award Modular BIOS v6.00PG
PSU: Xion 700 Watts

I have deleted old drivers and installed the latest drivers from the AMD website. I've asked redditors and they said my motherboard should be able to support PCI-E 3.0. What else can be wrong with my computer?

 

[Raheel Hasan]

make sure u plug pcie connector

 

[spat55]

You might want to get yourself a new PSU before it blows up.

 

[d1rtydeedz]

make sure u plug pcie connector

+1

 

[sleepinxonxbed]

make sure u plug pcie connector

That would be connecting the graphics card to the PSU correct? That I have already done.

 

[sleepinxonxbed]

You might want to get yourself a new PSU before it blows up.

Is my PSU not enough? What PSU would I need? I've looked at the AMD and NewEgg page and it says

"500W (or greater) power supply with one 75W 6-pin PCI Express power connector recommended
600W power supply (or greater) with two 75W 6-pin PCI Express power connectors recommended for AMD CrossFire™ technology. "

 

[d1rtydeedz]

It very well could be your power supply, the reviews are terrible. Think about a new one from Seasonic of XFX.

http://pcpartpicker.com/part/xfx-power-supply-p1750snlb9
http://pcpartpicker.com/part/seasonic-power-supply-m12ii620bronze

 

[Raheel Hasan]

ur psu is not reliable, u can get corsair cx430 in $40, when selecting a psu always go with corsair/antec/seasonic and see the if the power supply is 80+ certified.