I've since passed my card on to someone with more time and knowledge,
and I can say that my fuses were not blown,
but I appreciate you adding to the thread and sharing your findings.

Hopefully your card keeps on trucking and this info will be useful to other!

I can't see any circumstances that would make a 10k resistor in that environment read 0ohms other than
a short across it - solder blob, for example,
a wrong value or damaged resistor
a mistake in the schematic.

As it turns out I think it was the last option, at least according to readings taken by another user on another thread.
They described the cited resistors as 1k and jumper, so that's good enough for me.
Shame.

[I]"Sometimes changing the probes when measuring in-circuit can give different results (polarity dependencies).​"[/I]...

I've had a little bit of time to poke around.

I'm looking at the RX580/570/480/470 2.1 boardview - Thank you for letting me know about those.

I've already reported pin8 at bios chip reads constant value when the card doesn't work, but drops 0.1v almost immediately when it does work.
I observed the same pattern at u100 pin 4, PERSTB_BUF.

Output at 5V regulator is 5v under all circumstances.

VOut at U300 reads 1.8v under all cirumstances.

One interesting thing I did find is that around Q2604, providing VDDC_VDDCI_OE_VR,
...

Thank you for the reply, and suggestions.
I've been able to confirm that 5v and 1.8v rails are present, whether it works or not,
but going any further may be difficult without a riser or smaller cooler, as you say.

I'll see what else I can check, and go round the low ohm resistors as you suggest.
Thanks again.

Hello all,
I'm trying to troubleshoot an issue with an old GPU and this seemed to be the place to be! 👋

Hello all,

I have a Sapphire Radeon RX 570 Pulse ITX 4GB (single fan) which has started misbehaving recently.
The card was bought used maybe 5 years ago and has worked without issue until recently.
I have no reason to believe it has been worked on or physically damaged.


For periods of time it will be 100% perfect.
Perfect temperatures, no glitches or artefacts, solid FPS.
I can game, run benchmarks, do whatever without any problem.
I can reboot the machine as many times as I like and nothing changes

however, most times...