PCIe 3.0 Graphics card on a PCIe 1.0 Motherboard

[Sonny Mircea]

So i have an Asus m2n68-am se2 MB on my pc and i would like to upgrade my Graphics card to an Asus Radeon R7 240 2GB DDR3 128-bit thats running PCIe 3.0 x16 , as iread my MB supports PCIe 1.0 x16, so will the GC be compatible with my MB ? :/ and what kind of bottlenecking would i be looking at ?

Aditional info :
4gb of ram
CPU : AMD athlon x2 255 3.1 ghz

 

[te100]

Some sites and forums and the members in them claimed that all of them are backward and forward compatible while some claimed that they are not. They should be backwards compatible but with reduction in speed it will run at 1.0

 

[Dark Lord of Tech]

http://www.youtube.com/watch?v=1XNI1GactP8

 

[Sonny Mircea]

but uhm ive read that while some might work on 1.1 they wont on 1.0 and mine is 1.0 as far as i have checked :/

 

[Dark Lord of Tech]

That is true , sometimes they won't run , no 100% guarantee can be given.

 

[Darkbreeze]

It "should" run, but at the lower speed of the slot rather than at what the card is capable of. More important before even considering it is what PSU you have so we can determine if the power specifications will be met or not and whether the quality of the unit is such that it should even be used with an aftermarket card.

A lot of OEM PSUs that work fine with the onboard graphics or very low end cards will suddenly sputter and die, or just not be enough, once you install a higher end card. So what is your PSU model and brand? It should be on the PSU.

 

[Sonny Mircea]

atm im not using an onboard GPU , im using a GeForce 7300 GS ...

as for PSU im not really sure since the model and brand are written on the side that goes on the immobile side of my case and to access it i would need to take off the PSU which im not in the mood to do now , will return with an answer on that matter if u believe its actually mandatory ...

tbh i wouldnt mind buying a new PSU since this one is like 2 yo ... (believing its something around 450 watts or sth :/)

im more concerned if that 3.0 - 1.0 issue will eat alot of my gpu's performance... (i've seen the ivy bridge comparison chart and the video posted above by blackbird and in both cases they compare 1.1 2.0 and 3.0 rather than 1.0 ... )

 

[Darkbreeze]

I do actually think that it's mandatory, in fact, I guarantee that it is. Well, I guess not if you don't care about your hardware failing after you spend good money on it, but that's up to you. Here's why.

http://www.tomshardware.com/reviews/low-cost-psu-pc-power-supply,2862.html