BIOS Request for 2 R9 280X, One PCB V1.0, another PCB V1.2 (BF4 edition)

Question

Hi there, I have flashed both my cards to the 015.040.000.000.003435 (113-3865000-X77) BIOS that is found on tomshardware.
However, whilst my original card came with an older BIOS than this, my new card came with a newer version. (These will be shown below)
Whilst my cards have both been working fine, I have noticed that my PCB V1.2 card has a strange "voltage lock". Every piece of monitoring software I have tried to use says the voltage is always 1.2, or 0.950 based on load levels. These are the values that are inside the X77 BIOS when inspected with VBE. However, in MSI afterburner, the voltage is displayed as a different value. After having checked allow voltage control and monitoring in MSI AB. My voltage is not shown as a number, but rather a + and - modifier, much like PowerTune is. This modifier does work, after having played around, I have figured out that each integer in this modifier is in fact a single mV (or around that). MSI AB then displays my new card's voltage as a varying number, whereas my old card is shown as a flat line. As shown here
I have no idea where MSI AB is getting this "pseudo-voltage" value from, since both HWiNFO and GPU-Z both report that it is always 1.2v when under any load. However, it worth noting that this value, whilst I do not believe it is the typical VDDC value, does in fact have some impact on the card's voltage, as I have tried running benchmarks with this card, and with a lower voltage according to MSI AB the card does indeed run cooler.
I have also noted that HWiNFO does in fact, show that the new card is missing a whole load of sensors, labelled as "ChiL/IR PMBus" as seen here. I can only assume that this particular sensor module was removed from later PCB's, or that this card is faulty?
Please note. I have only experienced unlocked voltage control on both my old and new card whilst using the X77 BIOS.
If I use the BIOS that comes with the card, which for my old one is:
And for my new one is this:
Then I am unable to modify either the "pseudo-voltage" found on card 1, or the voltage found on card 2, regardless of MSI AB options.
The reason I am still running the X77 BIOS is that I want the ability to modify voltage, as it very important to me.
My S/N's are
PCB V1.0 card: 602-V277-19SB1309097475
PCB V1.2 (BF4) card: 602-V277-28SB1311072756
The PCB revision numbers (1.0 and 1.2) I have gotten from the bottom of the PCB, right next to the PCI Express connector. However I have not inspected the PCB to actually confirm they are different, and this maybe just be an identifier.

Answer 1

Hey there, the 330 BIOS is the exact same as the one my second card came with when I purchased it (same MD5 hash), I have flashed the 302 BIOS to my old card and switched my BIOS on the second card back to stock and now I cannot change voltages in afterburner. Are these cards by any chance voltage locked by design and the X77 BIOS enables voltage changes?
Since I need the ability to change my cards voltage I have since switched back to the X77 BIOS until I can resolve this issue. Thank you.