PCI Express 3.0 on 2.0?

[Nanovinnie]

So i finally decided to build my own pc, with this specs:
AMD A8-3850 2.9GHz
ASRock A75M-HVS FM1
AMD Performance RAM 8GB
Seagate Barracuda Green 1.5TB 5900RPM
Case: APEVIA X-TROOPER Junior Series

Since im low in budget right now, im going to buy the graphics card later, im thinking about the AMD Radeon HD 7750, but its PCI Express 3.0, and the motherboard only has PCI Express 2.0, can i still use it or do i have to buy another motherbaord?

Also, any suggestion about my specs and components are welcome.

Thank you.

 

[DJDeCiBeL]

It'll be fine. 3.0 is totally backwards compatible with 2.0. And besides that, there aren't any AMD boards that are 3.0 capable.

 

[jaquith]

The only differences I've ever seen are on 4-WAY SLI/CF with PCIe 3.0 vs PCIe 2.0, and on a single GPU running x16 PCIe 2.0 or PCIe 3.0 is ZERO difference (margin of error <1%). As mentioned a PCIe 3.0 GPU on a PCIe 2.0 MOBO or CPU simply runs at PCIe 2.0 bandwidth.

Nice article - http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/

 

[Nanovinnie]

Thanks guys for the fast reply, but, are the specs fine for running battlefield 3 for example on medium?

 

[DJDeCiBeL]

Thanks guys for the fast reply, but, are the specs fine for running battlefield 3 for example on medium?

Not @ 1080p, but at a lower res, probably so.

 

[jaquith]

The PCIe 2.0 vs PCIe 3.0 won't have anything to do with your settings. The things that affect your frame rate are the CPU, RAM (use 8GB;2x4GB), GPU(s) (including the GPU's clocks), and resolution (e.g. HD 1920x1080).

Review (AMD A8-3850) - http://www.anandtech.com/show/5541/amd-radeon-hd-7750-radeon-hd-7770-ghz-edition-review/17

My best guess on Medium is 30~35FPS with no AA. I really recommend average 45FPS minimum for smooth game play.

 

[Nanovinnie]

Best answer selected by NANOVINNIE.

 

[Nanovinnie]

Thanks to both of you.