GPU not using full PCIE Bus Interface

[KapteijnK]

Sup folks, hope all is doing well.

 

I've been noticing strange performance for my RTX 4080 Super + Ryzen 7 7800X3D Combo, I've watched some benchmarks of my favorite games and copied their settings and I noticed I got 50FPS less than the creators of the benchmarks I watched. This is quite odd, cause It is the exact same setup and temps. So I looked into it and noticed that in GPU-Z it shows a Bus Interface available of x16 4.0. But it only reaches x1 4.0 for me, I think this could be 1 of the reasons my performance is low, can anybody help me with this issue?

[Skipple]

1 minute ago, KapteijnK said:

could be 1 of the reasons my performance is low

almost certainly 

 

What motherboard do you have, what slot is your GPU installed in, and what SATA / NVMe ports do you have populated? 

[KapteijnK]

2 minutes ago, Skipple said:

almost certainly 

 

What motherboard do you have, what slot is your GPU installed in, and what SATA / NVMe ports do you have populated? 

My motherboard: MSI B650-S  Wifi (https://www.msi.com/Motherboard/PRO-B650-S-WIFI)
The GPU is installed in the top PCIE slot (closes to GPU) I have all NVME slots populated and no SATA.

[podkall]

5 minutes ago, KapteijnK said:

My motherboard: MSI B650-S  Wifi (https://www.msi.com/Motherboard/PRO-B650-S-WIFI)
The GPU is installed in the top PCIE slot (closes to GPU) I have all NVME slots populated and no SATA.

that's weird, and I assume you updated your chipset drivers already?

[Skipple]

7 minutes ago, KapteijnK said:

My motherboard: MSI B650-S  Wifi (https://www.msi.com/Motherboard/PRO-B650-S-WIFI)
The GPU is installed in the top PCIE slot (closes to GPU) I have all NVME slots populated and no SATA.

Okay, good. That all seems to be in order and there is no limitations or bifurcation on that motherboard, at least according to the manual. 

Next step is to make sure nothing is limited in BIOS for some reason. I would also update your BIOS as well while we are at it if you haven't already.

[KapteijnK]

Just now, Skipple said:

Okay, good. That all seems to be in order and there is no limitations or bifurcation on that motherboard, at least according to the manual. 

Next step is to make sure nothing is limited in BIOS for some reason. I would also update your BIOS as well while we are at it if you haven't already.

 

1 minute ago, podkall said:

that's weird, and I assume you updated your chipset drivers already?

I am trying to reinstall the AMD Chipset drivers rn, didn't do anything in BIOS with PCIE related settings tho. Only rbar is enabled by default. 

Also looked into the PCIE slot and the GPU it self and couldn't see any visible damage whatsoever

[Tetras]

Does GPU-Z show this when you're playing a game?

 

If you're running that when you're gaming the performance would probably be terrible, stuttering and stuff.

[KapteijnK]

3 minutes ago, Tetras said:

Does GPU-Z show this when you're playing a game?

 

If you're running that when you're gaming the performance would probably be terrible, stuttering and stuff.

Yea I ran it during a game, and also ran the Apply Load feature from GPU-Z itself it will always be stuck on 1x 4.0

[Tetras]

2 minutes ago, KapteijnK said:

Yea I ran it during a game, and also ran the Apply Load feature from GPU-Z itself it will always be stuck on 1x 4.0

Are you using a riser?

 

Did you have any issues with alignment while installing the motherboard?

[KapteijnK]

Just now, Tetras said:

Are you using a riser?

 

Did you have any issues with alignment while installing the motherboard?

I am not using a riser, just the 600W 12HPWR Connecter that came with my ATX 3.0 PSU

[KapteijnK]

Installing the chipset drivers did something, however it is stuck on x8 4.0 now

[podkall]

22 minutes ago, KapteijnK said:

Installing the chipset drivers did something, however it is stuck on x8 4.0 now

that's a start, even in gaming? I'd try this just to see how limiting 8x is, because 8x can already provide decent amount of bandwidth

[PDifolco]

23 minutes ago, KapteijnK said:

Installing the chipset drivers did something, however it is stuck on x8 4.0 now

Reseat the card and reset CMOS

[PDifolco]

33 minutes ago, KapteijnK said:

Installing the chipset drivers did something, however it is stuck on x8 4.0 now

Huh wait, with what GPU ?

A 1650 is only PCie3, so it should be the 3050 which is Gen4 x8, so that's normal !!

[KapteijnK]

2 minutes ago, PDifolco said:

Huh wait, with what GPU ?

A 1650 is only PCie3, so it should be the 3050 which is Gen4 x8, so that's normal !!

It is in fact a 4080 SUPER xD

[KapteijnK]

These are pictures of both the GPU and PCIE slot

[KapteijnK]

@podkall @PDifolco @Tetras @Skipple I found out enabling EXPO causes lowering the bandwidth, any ideas?

[Tetras]

Just now, KapteijnK said:

@podkall @PDifolco @Tetras @Skipple I found out enabling EXPO causes lowering the bandwidth, any ideas?

Nope, it makes no sense to me unless your RAM is so fast the CPU goes "AHH SHIT" and slows everything down to stop itself from exploding.

[KapteijnK]

2 minutes ago, Tetras said:

Nope, it makes no sense to me unless your RAM is so fast the CPU goes "AHH SHIT" and slows everything down to stop itself from exploding.

Mhm maybe not, just restarted my PC and it is back to the 1x 4.0

[podkall]

8 minutes ago, KapteijnK said:

@podkall @PDifolco @Tetras @Skipple I found out enabling EXPO causes lowering the bandwidth, any ideas?

EXPO causes lowering bandwidth? that's odd,

 

what's the bios version, check the Board's support drivers page, and see which version you're rocking (I think the only place to check version is in BIOS though)

[podkall]

19 minutes ago, Tetras said:

Nope, it makes no sense to me unless your RAM is so fast the CPU goes "AHH SHIT" and slows everything down to stop itself from exploding.

could it be caused by old BIOS version?

[Tetras]

1 minute ago, podkall said:

could it be caused by old BIOS version?

I would have thought a motherboard that can fit a 7800X3D would know what to do with a 4080, but who knows, bios bugs love surprises.

 

The most common reason in my experience is just that the card isn't seating properly, or the connectors need to be cleaned.

 

Windows pcie power management settings can do some funky stuff sometimes too.

[Skipple]

3 hours ago, KapteijnK said:

Skipple I found out enabling EXPO causes lowering the bandwidth, any ideas?

 

5 hours ago, Skipple said:

update your BIOS

 

[podkall]

10 hours ago, Tetras said:

I would have thought a motherboard that can fit a 7800X3D would know what to do with a 4080, but who knows, bios bugs love surprises.

 

The most common reason in my experience is just that the card isn't seating properly, or the connectors need to be cleaned.

 

Windows pcie power management settings can do some funky stuff sometimes too.

I mentioned it because it supposedly happens only when EXPO is enabled, which could be at core available on RAM but support could be flimsy since it's a new thing and got released after AM5, at least I think it released briefly after DDR5

[KapteijnK]

47 minutes ago, podkall said:

I mentioned it because it supposedly happens only when EXPO is enabled, which could be at core available on RAM but support could be flimsy since it's a new thing and got released after AM5, at least I think it released briefly after DDR5

I have found out it changes whenever I change any BIOS setting. Not just EXPO