AMD and PCIe3

[Dmented]

I committed a cardinal sin and assumed a graphics card would work with my motherboard. Unfortunately for AM3 motherboard users all new top end AMD graphics cards are PCIe3 and apparently it's hit and miss if the card works on AMD boards with PCIe2 slots. After some investigation I can only find 1 motherboard which is AM3 and gen3, the bad news is that you cannot get it even though its still on amazon and the manufacturers website. I currently use an ASUS Sabertooth 990FX board and would have been happy to have switched to the gen3 version which is still advertised on the ASUS website.

My question is are there any other AM3 gen3 boards in existence and if not then what are they playing at??

 

[Suztera]

There isn't really any other since the chipset doesn't actually support pcie gen 3. There is no point in adding a PLX chip to allow theoretical pcie 3.0 slots on the AM3+ platform. It's outdated and is expected to be replaced soon.

 

[Dark Lord of Tech]

No they don't exist.

 

[Dark Lord of Tech]

No reason most new cards shouldn't run in a PCIE 2.0 slot.

 

[Dark Lord of Tech]

Plus a 3.0 card isn't held back by a PCIE 2.0 slot.

FX CPU's hold back the higher end cards.

 

[Rogue Leader]

My Board is far older and lower gen AM3 than yours and has no problem with PCIe 3.0 GPUs.

How about you explain more about the problem and what you tried to use?

 

[jeffredo]

There was one ASUS Sabertooth AM3+ board that had PCI-E 3.0 but it was via a bridge chip and had a limited production run. Doesn't matter - there's like an FPS or two difference when using a PCI-E 3.0 in a PCI-E 2.0 slot (and their backwards compatible).

 

[Dmented]

I currently have an ASUS Sabretooth AM3+ 990FX motherboard (not the R2.0), and tried to use the Sapphire Nitro Radeon R9 Fury Tri-X. The card fires up, but there is no picture, not even the BIOS screen. So I guess I'm one of the lucky people that has a motherboard which does not work with PCIe3 graphics cards....

 

[Rogue Leader]

I currently have an ASUS Sabretooth AM3+ 990FX motherboard (not the R2.0), and tried to use the Sapphire Nitro Radeon R9 Fury Tri-X. The card fires up, but there is no picture, not even the BIOS screen. So I guess I'm one of the lucky people that has a motherboard which does not work with PCIe3 graphics cards....

Theres a hundred other things that could cause that problem, it doesn't mean the board is incompatible with the card you do know that right?

This site actually tested it:

https://www.techpowerup.com/reviews/AMD/R9_Fury_X_PCI-Express_Scaling/

 

[Dmented]

I understand that there could be other issues, but my old AMD 6990 graphics card works just fine, which sort of points to either the new graphics card or a compatibility issue and I have heard of others having issues trying to run a PCIe3 card on a PCIe2 motherboard.

 

[Rogue Leader]

I understand that there could be other issues, but my old AMD 6990 graphics card works just fine, which sort of points to either the new graphics card or a compatibility issue and I have heard of others having issues trying to run a PCIe3 card on a PCIe2 motherboard.

So possibly the new GPU is defective. Did you try exchanging it first?

I have never heard of this issue, And PCIe 3.0 GPU's have been around since the 79xx series, this problem would be pretty prevalent if it were normal.

 

[Dmented]

I only received the GPU yesterday and after trying out a few things and then trawling the internet and discovering others had a similar issue with some of the latest graphics cards, I thought I would see if the community would have any knowledge on this issue.

 

[Rogue Leader]

I only received the GPU yesterday and after trying out a few things and then trawling the internet and discovering others had a similar issue with some of the latest graphics cards, I thought I would see if the community would have any knowledge on this issue.

You should consider exchanging the card in case there is something wrong with it before writing it off....