"using BIOS from hancor's post #2 as source"

Ahah, Lost_N_Bios really is a WinRaider...!



I checked the P9X79 manual and there are no drop down menus, in the "Advanced" tab, to manually configure the PCIe speeds; as found more ubiquitously on the later Z87 chipset bioses.

From the discussion page montegonexus cited:

"DisplayPort 1.2 allows for Multi-Stream Transport (MST) support, letting you drive two displays with a single DP cable. But why does that matter if the ASUS is your only monitor? Because to get the full 60Hz refresh rate out of it, DisplayPort needs to see it as a pair of 1920x2160 monitors that each get their own signal."

Of course if you are running two monitors then just get a second dedicated cable, no mess, no fuss.

There are 3 connectors DP, HDMI and DVI. If you're not pumping pixels for gaming, pick the DP and HDMI ports and move on as a practical matter.

Some of the links you cite are from different manufacturers eg GXORE (a chinese knockoff firm) and Visiontek.
While they claim 4K compatibility the problem is that their board implementation may be vastly different.
When you begin crossflashing bios/UEFI from different manufacturers you are in for a very big world of digital hurt. This is likely not where you want to go...
I would submit you will be bricking boards in VOLUME! In short, the black flag above will have new meaning.

Cheers

@hancor - easier to grab the BIOS I knew he was already using, rather than hand him some super unlocked BIOS with too many settings visible
However, no BIOS mod done, I see default was set to x16 for the x16 slots anyway, instead of the Auto I suspected that was maybe causing this. The only time I've seen this issue is randomly on any board, usually driver re-up or clean contacts, or simply pull/re-insert card usually fixes it.

However, since this is showing up during vBIOS update, and wont go back even with stock vBIOS reflash, I'm suspecting something is up with ATIFlash now? What do you think about that, maybe agree that could be possible cause?

Speeds can be adjusted in BIOS at Advanced >> System Agent Configuration
Lane width (and speed copies too) are in hidden System Agent Configuration >> IOH Configuration page
Check BIOS with AMIBCP 4.55, then you can see all this.

Thanks for adding your thoughts and info on the 4K stuff, I have no idea about any of that, and was going to suggest maybe he emails Asus and ask. That may even invoke them to send him an updated vBIOS directly in email.
Stuff you mention, I assume only applies to higher end cards, doesn't seem like something budget/mid-range cards would be capable of, but he showed info that 4K should at least be possible with this model

@hancor:
@Lost_N_BIOS:
Never said to crossflash anything between manufacturers. I just assumed that 4K and 8K is possible with my hardware since some manufacturers did it. I asked if there is a possibility to unlock the 4K capability on my 7750. Anyway I will try this nBIOS and I will post results again.
UPDATE:
I have tried the last Bios but no change at the x8. Thank you both anyway my friends. I guess I will have to live with x8 now.

Try reflashing stock vBIOS with older ATIFlash versions, until you get one that works, then redo the mod version w/ fingers crossed

https://www.techpowerup.com/download/ati-atiflash/
Click "Show More Version" below download on left side, and you can get all versions (Don't go back to versions before the card came out - 2/2012)

Another thing to try, before you do anything else, is reflash main BIOS again, then load optimal settings, and then check in windows and see if still x8

"I just assumed that 4K and 8K is possible with my hardware since some manufacturers did it." Not always a good assumption as manufacturers often make custom PCBs (printed circuit boards) which may or may not have certain capabilities.

Of course if the manufacturer implemented 8K for a FIVE year old card, they wouldn't have a reason to exist and SELL you a shiny NEW graphics card. 8K even at this time would be for a very expensive monitor; in which case you would be buying an upscale graphics card to match. Likely this is not in your stated budget...

see this article: https://www.pcgamer.com/8k-monitors-are-...l-be-expensive/

Cheers

@Lost_N_BIOS:
I re flashed the mobo bios, loaded optimized defaults and then re flashed vBIOS of the card and I am very happy to say that x16 is now enabled permanently except that 3.0 is enabled when the card is under stress only. In normal condition is x16 1.1. So I call it success.
@hancor:
As I said before I bought a 4K monitor. I was referring to the capabilities of the card up to 8K which means that the card's hardware supports it. Never thought of buying an 8K monitor. Anyway everything is smooth now.

Thank you both for your help my friends. Nothing would have been accomplished without your valuable help.

You're welcome, and it's great you finally got this fixed again @montegonexus - the PCIE 3.0 and 1.1 is normal expected operation of the AMD Drivers, it's power saving feature (actual GPU clocks often go down too, but not always, see this in the sensors tab)
See, here is mine, and under load it goes up to x16 3.0 and clock speed go back to regular max speeds too


So, x16 again, and you did get OS installed via secure boot now too, correct?

Zitat von montegonexus im Beitrag #81

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@Lost_N_BIOS:
I re flashed the mobo bios, loaded optimized defaults and then re flashed vBIOS of the card and I am very happy to say that x16 is now enabled permanently except that 3.0 is enabled when the card is under stress only. In normal condition is x16 1.1. So I call it success.
@hancor:
As I said before I bought a 4K monitor. I was referring to the capabilities of the card up to 8K which means that the card's hardware supports it. Never thought of buying an 8K monitor. Anyway everything is smooth now.

Thank you both for your help my friends. Nothing would have been accomplished without your valuable help.

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@Lost_N_BIOS:
Yes I have installed win 10 Pro properly.
@hancor:
Really can't describe how happy I feel now that everything worked well. As for the Ouzo drink it's not my favorite and in general I have been a social drinker since 1996, meaning that I will drink one or two drinks once or twice a year. Sometimes these drinks are consumed in a 5 years time. I used to consume a lot of whiskey on a daily basis back then but I decided to keep a distance since and stay clean.

Thanks again. You are awesome my friends.

@Lost_N_BIOS:
@hancor:
UPDATE!!!
I have decided to buy a new graphics card and I bought the Asrock Radeon RX 560 2GB Phantom Gaming (90-GA0400-00UANF). I have the same problem with the x8.0 bus speed. I have tried BIOS reset and new drivers but it does not go to x16. Any suggestions? Thank you.

Zitat von montegonexus im Beitrag #85

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@Lost_N_BIOS:
@hancor:
UPDATE!!!
I have decided to buy a new graphics card and I bought the Asrock Radeon RX 560 2GB Phantom Gaming (90-GA0400-00UANF). I have the same problem with the x8.0 bus speed. I have tried BIOS reset and new drivers but it does not go to x16. Any suggestions? Thank you.

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@hancor:
Thanks but the price is twice the amount I have paid for.

Asrock makes graphics cards?

Zitat von montego im Beitrag #87

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@hancor:
Thanks but the price is twice the amount I have paid for.

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I can't download this bios file. Can you put it up again ? Asus P9x79 (BIOS modded for NVMe SSD booting)

Thanks