RX7900 XTX always show PCIe x16 4.0

kapone32 · Nov 7, 2023

TechPowerUp GPU-Z 2.55.0 2023-11-07 11_39_25 AM.png

Does it matter if the GPU clock is doing nothing what the Bus interface Face.

Assimilator · Nov 7, 2023

Chrispy_ said:
For the record, even with PCIe link state power management enabled in the BIOS, and with the W11 power plan on balanced, my 4060Ti is sat at PCIe 4.0 x8 as expected. It also does not drop down to PCIe 1.1.

What's your monitor config?

kapone32 said:
View attachment 320564
Does it matter if the GPU clock is doing nothing what the Bus interface Face.

Your driver install is borked.

Macro Device · Nov 7, 2023

Chrispy_ said:
They're different GPUs, made 7 years apart.

I was talking RTX 3060 I got for testing purposes, not the OP's old GPU, it's the same generation.

Chrispy_ said:
Expecting them to behave identically is illogical.

Indeed. Yet I didn't state it's something wrong, I only stated they behave differently and I wanted an explanation for this.

Chrispy_ said:
the risks of issues with BIOS/Windows not handling energy management 100% correctly is not something AMD want to be deal with?

Seems legit.

Chrispy_ · Nov 7, 2023

Assimilator said:
What's your monitor config?

Your driver install is borked.

4K120 OLED + Odyssey headset.

I'm not at home any more, so I can't test without the headset connected, but the GPU already sits at about 7-8W when idly web-browsing. Power saving is not a concern I have at that point.

R-T-B · Nov 7, 2023

Beginner Micro Device said:
Doesn't change anything in my case.

Sounds like a bios config issue at that point.

EDIT: just read about the 3060. Dunno then.

AusWolf · Nov 7, 2023

Chrispy_ said:
You'd need an AMD rep to get you a definite answer but it's possible newer GPUs don't do it

They do! I have a 7800 XT that scales down so x1 1.1! I said it like three times already.

The key is in the BIOS power saving settings, and the link state power management setting in Windows.

Todestrieb · Nov 9, 2023

Here's a few screenshots I took before and after I did the GPU swap (3070 -> 7900XTX).
On dual monitors (1080p 144Hz) the 3070 can go Gen1.1. With my 4K monitor attached, both card stayed at Gen3. (My board doesn't support Gen4.)

My guess is either the monitor config, or a 7900XT(X) specific thing.

aiccqtc · Nov 13, 2023

AusWolf said:
They do! I have a 7800 XT that scales down so x1 1.1! I said it like three times already.

The key is in the BIOS power saving settings, and the link state power management setting in Windows.

It's correct answer. According to the setting can down to x1 1.1
Thanks

System Name	Best AMD Computer
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Storage	32GB eMMC and 128GB Sandisk Extreme U3
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Video Card(s)	XFX RX 7900 XTX Speedster Merc 310
Storage	Intel 5800X Optane 800GB boot, +2x Crucial P5 Plus 2TB PCIe 4.0 NVMe SSDs
Display(s)	55" LG 55" B9 OLED 4K Display
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Processor	Various Intel and AMD CPUs
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RX7900 XTX always show PCIe x16 4.0

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