GPUz reporting graphics card at PCIe 2.0 x8 instead of x16 RX480

philm01

Honorable
Mar 28, 2015
26
0
10,530
Hello all,

I recently obtained a RX480 graphics card. However, when I checked the hardware specs in both the radeon software and gpuz, the machine is reporting that the graphics card is running at x8 mode instead of x16. For those wondering, I do have this in the first slot and the first slot on my mobo is for x16.

Now, it could be that I am sticking a new grahics card into an old mobo. My specs are as follow

Processor: FX-8320
RAM: 8gb RAM
Graphics: RX480
Motherboard: Asus sabertooth 990fx r1.0 <- Yes, this mobo is old. But hey, it still works fantasic! Don't fix what ain't broke

Looking online, there could be some setting in the bios with usb3.0 interfereing with the speed, supposedly. (This part doesn't make much sense since my USB busses are not connected to the pci bus) I also saw that the bios could possibly be setting the speed to be less then x16. I looked in the bios to see if I could find this but I didn't find much.

Again, it could be that I am fitting a newer card in an older mobo. And it is just reporting the x8 for this reason. Havent done a benchmark yet. I want to make sure that there isn't some other issue I need to worry about.

Any ideas from the community?
 

philm01

Honorable
Mar 28, 2015
26
0
10,530


Hello shrapnel,

Thank you for your input. I was aware that the FX line only supports 2.0. The zen processors will be AMDs step into pcie 3.0

However, since the card supports 3.0 x16, I would imagine that the bus maxs the speed and defaults to x16. However, it is being reported as x8. Is this not the case?
 

philm01

Honorable
Mar 28, 2015
26
0
10,530


I believe that this is the case. There must be a built in power savings with the GPU. I apologize. This is my second GPU that I have owned. Do all GPUs contain this or is it the high end ones?

I used the GPUz load utility (when you click the question mark, that nice little graphic that comes out), there was no change in the reporting of the bus speed. However, when I looked back at it after some more heavy loading, the bus speed changed to the full speed.

As a side note, I saw it change to v1.1 x16