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Journeyman III
Journeyman III

PCIE 4.0 GPU on PCIE 2.0 MOBO.

Hi Guys,


I have Asus P8Z68-V motherboard & i want to upgrade my GPU to RX 5600 XT is that Ok?

My boards has PCIE 2.0 x16 while the RX 5600 XT has PCIE 4.0 x16.

Thanks.

11 Replies
Miniboss
Miniboss

Re: PCIE 4.0 GPU on PCIE 2.0 MOBO.

PCIE 4.0 is backwards compatible with PCIE 2.0 so the graphics card will work  fine.

There might be some bandwidth limitations but I don't think the RX5600 XT will even cap the PCIE 2.0 limit.

Big Boss
Big Boss

Re: PCIE 4.0 GPU on PCIE 2.0 MOBO.

fyrel wrote:

PCIE 4.0 is backwards compatible with PCIE 2.0 so the graphics card will work  fine.

There might be some bandwidth limitations but I don't think the RX5600 XT will even cap the PCIE 2.0 limit.

PCIe is forward and backward compatible.

Some time ago somebody with a R9 Fury tested it with 1 lane to 16 lanes of PCIe 1.1, PCIe 20 and PCIe 3.0

The Fury was a tad slow with 1 lane but with 2 or more it was good to go. Video cards are over provisioned with bandwidth.

Esteemed Contributor III

Re: PCIE 4.0 GPU on PCIE 2.0 MOBO.

fyrel is exactly correct. I would think your issue is more what CPU are you pairing with it? That is an Intel 2nd gen board for the i series. If you have unlocked i7 you may be able to drive that card to your liking but some CPU bottlenecking is still possible. If you have anything less than the i7 you likely will have bottlenecking with the CPU. 

You can always buy the card and see how it performs for you. You can also move it to another system when you decide to upgrade. 

Big Boss
Big Boss

Re: PCIE 4.0 GPU on PCIE 2.0 MOBO.

pokester wrote:

fyrel is exactly correct. I would think your issue is more what CPU are you pairing with it? That is an Intel 2nd gen board for the i series. If you have unlocked i7 you may be able to drive that card to your liking but some CPU bottlenecking is still possible. If you have anything less than the i7 you likely will have bottlenecking with the CPU. 

You can always buy the card and see how it performs for you. You can also move it to another system when you decide to upgrade. 

maybe if the OP has a Celeron but even an i3 can manage fine

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Esteemed Contributor III

Re: PCIE 4.0 GPU on PCIE 2.0 MOBO.

Well I guess it depends on your definition of fine. 

i3's were dual core only at that time and will most definitely seriously bottleneck a 5600xt. Sandy bridge while great at its release is pretty slow now by today's standards. And core counts are going higher and higher. There are games out now that 4th and 5th gen quad cores are struggling with. An i7-2600k will struggle with some games now and even it will lose frames on this mid level GPU.

Even the online bottleneck checkers show significant issue with what you say is fine.

According to them it is EXACTLY as I said. 

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Big Boss
Big Boss

Re: PCIE 4.0 GPU on PCIE 2.0 MOBO.

I have an i3-2100 and it is not all that bad with a UEFI board. The Asus board it is parked on was upgraded to UEFI so I had to reinstall windows on the machine more than once.

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Adept I
Adept I

Re: PCIE 4.0 GPU on PCIE 2.0 MOBO.

PCIe 4.0 gpus are NOT compatible with PCIe 2.0 motherboards. I've tried a 5700 Red dragon to work into an Asus p7p55d-e socket 1156 and will post into BIOS but will black screen permanently before showing the windows 10 logo. No matter which changes i do on bios, it will not enter windows. Now, if you use whatever PCIe 3.0 GPU you get , it will work, no issues, even at default settings. So for me, this is quite clear.  

Big Boss
Big Boss

Re: PCIE 4.0 GPU on PCIE 2.0 MOBO.

piskeante wrote:

PCIe 4.0 gpus are NOT compatible with PCIe 2.0 motherboards. I've tried a 5700 Red dragon to work into an Asus p7p55d-e socket 1156 and will post into BIOS but will black screen permanently before showing the windows 10 logo. No matter which changes i do on bios, it will not enter windows. Now, if you use whatever PCIe 3.0 GPU you get , it will work, no issues, even at default settings. So for me, this is quite clear.  

That is a BIOS problem not a hardware one.

I tested a GTX 1060 on an old DDR2 machine and it works fine. So does a GTX 750.

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Esteemed Contributor III

Re: PCIE 4.0 GPU on PCIE 2.0 MOBO.

Not sure why it would not be backward compatible that is something that should be brought up to the experts to answer. I absolutely believe it is not working. Hardly the only head scratcher on these Navi cards. Make sure to report exactly that to AMD: https://www.amd.com/en/support/contact-email-form

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