Solved graphics card pci express 2.1 will work with 1.0 dg31pr

[abdullahtaha]

hello

i have intel motherboard dg31pr and i m planning to buy new graphics ccard which is HD 6670 OR HD 6750 .....

the problem is will i be able to run pci e 2.1 on 1.0 or i should buy another card !

And My psu is 450 watts ! will it work on that psu or i will have to upgrade it too

reply ASAP !

 

[stormy13]

abdullahtaha, welcome to the Seven Forums.

To answer your question, yes it will. PCI-E 2.1 is backwards compatible with 1.0. The card may not perform as fast as it is capable of (a few per cent, if that), but it will work just fine.

As far as the PSU goes, as long as it is a decent one and not some no-name one, it too will be fine.

 

[abdullahtaha]

thank you so much for Such a fast reply !!

 

[Cubicsilver]

I Just tried to install a 5570 on my DG31PR yesterday and it wouldn't post.
I then dropped the 5570 onto a newer GA-MA770-UD3 AM3 motherboard and it worked. So I tried it in an older 939 board and no post. So it appears that pcie 2.1 isnt always backwards compatible.

 

[stormy13]

Cubicsilver, welcome to the Seven Forums.

It can also be caused by an incompatibility between the video card and the motherboard bios. As far as your motherboard goes, it supports PCI-E 2.0,

Intel® Desktop Board DG31PR

I would make sure you have the latest bios for the motherboard as it is possible that there was a compatibility update along the way for it.

As for the old 939 board, if it is a bios compatibility issue then there is likely not much to do considering the age of it and all support for it was likely dropped a fair while ago.

 

[Cubicsilver]

You're right. I also tried a 6770 and 5450. Both failed to post. The DG31PR I have has the lastest bios. According to Saphire technical support, 2.1 is technically backwards compatible with 2.0, 1.1, and 1.0a, only if the motherboard bios has been updated to support it. So it looks like this motherboard does not support 2.1 cards.

However, I also tried a GTX 460 and it worked! (PCIE 2.0)

 

[abdullahtaha]

i just recieved my Ati Radeon Hd 6750 !! and it works perfectly on DG31PR !! thanks so much stormy 13 !! reps added