@TheCM - Just search ebay for item 313073675375 - this is not a US Listing, it’s in China 
Anyway, it’s only example to show you, best way to search is this terms (all categories) >> 1.8v adapter SPI
I don’t know if one chip is EC and one in BIOS, as mentioned, it could be split BIOS across two chips, or EC one one and BIOS on another. We can’t tell until you give me dump from each chip.
If you flashed BIOS to wrong chip, nothing you can do except fix it later when you can program both chips. DO NOT write anything to the other chip, or erase it, once you get this adapter, so we can see what is there before you do anything!
What is BIOS ID per # in that image? Only #1 looks like BIOS chip, 2-4 do not look like the other chips you showed me, but hard to tell which are square and which are rectangle for sure.
But I guess that MX25U4033E is much more rectangle than usual BIOS square so I guess it’s one of those others. None of them should be vBIOS, since it is it’s own card, the vBIOS for that if stored on card would be on it’s own PCB usually
And, checking your BIOS dump now, I see Nvidia GP107 vBIOS in BIOS, so I now doubt any chip on the board is vBIOS, since it’s in the BIOS itself!
I assume the following, correct?
#4 = MX25U4033E - 4MB
#1 = MX25L6473F - 8MB
Also, looking at the board now, and images of chips, I think this is is also possible candidate, so maybe vBIOS is on one and not on the card PCB.
25D10BT << This is Gigadevice 25D10BT (128KB) Probably EC FW chip, dump this and send to me so I can see what is on there. Use all of these, and send me dump from each so we can compare, or you can compare, if all same, just send me one
CH341A v1.31(1.4) (CH341AFree) + ASProgrammer 1.41 + CH341 Programmer v1.1.1.32 + Colibri + 1.34 and GD2510 ID
When possible, use correct 128KB size, and GD25D10 ID (may have to use GD25Q10 in some programs)
What chip did you dump above file at uploadfiles.io from, and are you 100% sure? This is complete BIOS 
Whichever chip this came from is the one you need to be programming BIOS back to, and due to you dumped it, and it’s size (8MB), it must be MX25L6473F
Program BIOS.all to this chip and see if it will start the board or not.
So, unless the 4MB chip is messed up, you may not need 1.8v adapter!
I’d go ahead and order though, just so you have, and in case you need, but hopefully we can get it working before having to dig into this chip after some long shipping wait
Sorry, not sure what guide you are talking about, but no programmer or item mentioned here is AMD specific