How big is the performance difference between PCI-E 3.0 and 2.0?

Achint2000

Distinguished
Feb 10, 2013
692
2
19,165
I want to know how big performance hit does PCI- 3.0 has over PCI-E 2.0. The lame thing is that:-

1. I have a PCI-E 3.0 Motherboard (ASUS P8Z77-V),

2. PCI-E 3.0 Graphics Card
(ASUS Nvidia GTX 650 TIB 2GB DCU-OC2 Edition)

But not a PCI-E 3.0 Supporting CPU! :( (Intel Core i5 2310 @ 2.90 GHz)

I want o make a nice upgrade to i7 3770K as my old CPU is getting crappier day by day. It generates ultra high temps (110 C) after doing all I could!

I am also planning to upgrade to 2x GTX 650 Ti Boost 2GD5 DCU-OC2's via SLI (Hope that wouldn't be too buggy).

So, I hope PCI-E 3.0 will make a bit good effect over PCI-E 2.0 as 2x SLI over my GPU will be needing a lot of bandwidth
to perform good.

I also want to know that how nice games will run. I hope they're not too buggy as I wanna play games like Assassin's Creed Series, DmC Devil May Cry 5 and Saints Row IV on my custom resolution on a 1366x768 (19 Inch) monitor -
3600 x 2025 and Ultra High Settings.

Any experiences are welcome.
~Thanks.
 

Achint2000

Distinguished
Feb 10, 2013
692
2
19,165


Well, if I had that kinda money I would do so definitely but I don't. Can the difference be calculated in FPS?
And I'm talking about 2x GTX650 TIB, will that also be very "little" difference?