Updating gaming system

[link575]

Hello all, I'm looking to update my build as I built it in 2010 and have not gotten anything new since. Currently I have:

CPU: I7-920
GPU: HD 5870
Motherboard: ASUS P6X58D
RAM: G.SKILL PI Series 6GB

I get that if I update my cpu i pretty much have to get new everything which is expensive so my question is what's a bigger bottleneck, my cpu or my gpu? Or should I just upgrade everything? Thanks for the help.

 

[AMD Radeon]

definitely your GPU is the lowest performer in the list

you can buy AMD Radeon 280X or GTX 770, which is 2-3x times more powerful than 5870

and you can OC your CPU to get more juice

 

[link575]

Alright that's what I thought but wanted to make sure. I was looking at the 770 but found this http://www.newegg.com/Product/Product.aspx?Item=N82E16814121779 780 for 490. I know it's kind of overkill but do want to upgrade my other stuff in the very near future and want to future proof it as much as I can. Is the benefit of that 780 large enough over 770 to be worth it do you think?

 

[AMD Radeon]

gtx 770 is now as low as $330
while gtx 780 stays still at $490 mark

$160 gap isnt worth it

for the best price GTX 770, please refer to my signature $1000 build below

 

[link575]

alright thanks a lot