RX 480 No Signal on new setup - Motherboard incompatibility? At a loss.

[Madsen03]

Hi all, this is a bit of a ******** for me at this point so please bear with me, I want to try to go through as much of the troubleshooting I've done as possible to avoid wasting anyone's time.

I was using an FX4300, Asrock 760gm-hdv, 8gb ddr3, rx480 8gb (SKU 21260-00) setup but decided to upgrade and picked up:
- Intel i5 10400f
- Gigabyte H410m S2H (later replaced by an ASUS Prime H410M-E; I'll get to that)
- G.skill aegis 2x8gb ddr4 @3000mhz

I slapped my old parts into another pc with a 560ti and installed the new ones with my rx480.
Attempting to boot the new setup with the RX480 gave me no display signal - at that point I tried to slot in an old HD 4550 into the new build and everything worked flawlessly. I then try to boot new build with the 560ti - everything works fine again. So it's not the hdmi cable, it's not the pcie slot on the new mobo.

Worried that my 480 is dead, I plug it into the old setup with the fx4300 and... it works fine. The PSUs are 500 and 600w for the old and new setups respectively and both have run the 480 no questions asked, so neither of them are dead or insufficient. Have tried all possible configurations of the RAM as well, no change, and the RAM does work when I boot with other cards.

I tried updating the bios for the new motherboard to the new version - no dice. Same with fiddling with bios settings - CSM on or off, above 4g encoding, just about every setting that makes any mention of UEFI or Legacy I try either way, etc. - once again, no luck. No signal when I use the RX480 with the new build, but it works fine with both the 560TI and the 4550.

To be clear, the 480s fan does spin up with the new build (and yes lol I'm plugging in the 6pin), I just get no display with it specifically. I booted with the 4550 and used DDU to clear previous drivers, I've reset the CMOS twice now, still no display from the 480 and only the 480 in the new setup. Will also mention that I'm almost certain the system is booting, to Windows, as I've found that in the first couple of seconds when I boot the system with the RX480 I only need to press the power button once to shut it down (as per the BIOS setting), but when I let it go for a minute (ie, when I give it enough time to get to Windows) I need to hold down the power button.

At this stage I return the Gigabyte motherboard and grab an ASUS one - exact same situation. No signal from the 480, works completely fine with the other 2 cards.

What's the chances that my 480 just doesn't play well with the BIOS' on these new motherboards? I'm seriously confounded, as searching up the SKU of the card gave me the knowledge that it's a UEFI card, but it works just fine on the AM3+ socket motherboard, but not on the LGA1200 ones.

I'm approaching wit's end here and an contemplating just shelving the RX 480 and trying to sell it while the GPU situation is as crazy as it is and using the 10400f system with a 560 Ti (ugh...).

Would really really appreciate any advice.
Cheers

 

[five8five]

Have a look BIOS for the PCIe setting, it might be 4.0, or auto. Set it to 3.0.

 

[five8five]

Also there was that thing about the rx480 drawing more power than standard from the PCIe socket? Maybe there's a setting in the BIOS?

Rings a bell about compatibility with the UEFI BIOS, no legacy support? Maybe someone else can chime in.

 

[Madsen03]

Have a look BIOS for the PCIe setting, it might be 4.0, or auto. Set it to 3.0.

It's been on Auto, with the max set to 3.0; I tried switching it to 3.0 manually with the old mobo. I'll try on the new on as well.

Also there was that thing about the rx480 drawing more power than standard from the PCIe socket? Maybe there's a setting in the BIOS?

Yeah this has come up as well, have been scouring the internet about my issue for a week now. I don't believe at this stage that this is the cause, as the RX480's power draw issues shouldn't really come up just in getting to BIOS - all testing that was done seemed to indicate it was an issue when under load.

 

[five8five]

Have had look for an updated vBIOS for the card?

 

[oweneades]

Maybe also try switching the PCI-e to 2.0 if 3.0 doesn't work.

I had this issues on a GB B450I MB with my old Kepler based Titan GPU. Refused to display any picture until I forced PCI-E 2.0 in the MB bios.

I have no idea why this worked for me as the Titan worked fine in a X570 board with the bios PCI-E just set to auto.

Not ideal but worth a shot if you have exhausted all other options.

 

[Madsen03]

Have had look for an updated vBIOS for the card?

I've done some very light googling but didn't go far past seeing there's nothing official on AMD's support page for the card, no.

Maybe also try switching the PCI-e to 2.0 if 3.0 doesn't work.

I had this issues on a GB B450I MB with my old Kepler based Titan GPU. Refused to display any picture until I forced PCI-E 2.0 in the MB bios.

I have no idea why this worked for me as the Titan worked fine in a X570 board with the bios PCI-E just set to auto.

Not ideal but worth a shot if you have exhausted all other options.

Just tried with 2.0 and 3.0 individually, rather than Auto; no luck unfortunately.

 

[Uhtred]

My RX 480 has a dodgy port so I can only use 3 of the 4 available, I doubt that's the case here but I thought I'd mention it.

Do the new m/b have onboard graphics?

 

[HangTime]

It's an F CPU so I assume no graphics.

I'm almost certain the system is booting, to Windows, as I've found that in the first couple of seconds when I boot the system with the RX480 I only need to press the power button once to shut it down (as per the BIOS setting), but when I let it go for a minute (ie, when I give it enough time to get to Windows) I need to hold down the power button.

I think that's kind of irrelevant as if you can't even see the POST screen or enter BIOS then it's not even worth worrying about Windows just yet.

Most of my suggestions you've looked at already like new mobo, different GFX card etc, the only thing I can suggest is try using the other PSU in the new rig (i.e. put the 500W one in). Maybe it's an issue with the 600W PSU not being able to supply sufficient power via the 6pin or whatever (long shot but worth a go especially given you know the RX480 works in the old rig with that PSU). The 600W PSU might actually be weaker than the 500W PSU depending on what it is.

edit: also try unplugging all your drives etc to reduce power usage, and check nothing is getting shorted (maybe remove motherboard from case for testing purposes).

 

[Joxeon]

Which model of 480 is it?

 

[Madsen03]

I'll start by mentioning that I've sold the 480 and bought a 580 (which works perfectly!) - for a profit as well, lol, go figure - but I'll reply to stuff in case some poor sap in a similar predicament stumbles upon this at some stage.

My RX 480 has a dodgy port so I can only use 3 of the 4 available, I doubt that's the case here but I thought I'd mention it.

Do the new m/b have onboard graphics?

Yeah I don't know that the 480 was dodgy as it worked perfectly fine on another setup. No integrated graphics; like HangTime said, F cpu.

It's an F CPU so I assume no graphics.

I think that's kind of irrelevant as if you can't even see the POST screen or enter BIOS then it's not even worth worrying about Windows just yet.

Most of my suggestions you've looked at already like new mobo, different GFX card etc, the only thing I can suggest is try using the other PSU in the new rig (i.e. put the 500W one in). Maybe it's an issue with the 600W PSU not being able to supply sufficient power via the 6pin or whatever (long shot but worth a go especially given you know the RX480 works in the old rig with that PSU). The 600W PSU might actually be weaker than the 500W PSU depending on what it is.

edit: also try unplugging all your drives etc to reduce power usage, and check nothing is getting shorted (maybe remove motherboard from case for testing purposes).

I've tried with both PSUs; neither made a difference in the newer setup, and both worked perfectly in the old one.
I'll add that I'd breadboxed the setup multiple times, minimal unnecessary stuff plugged in - no diff.

Which model of 480 is it?

T'was a reference Radeon 8GB model, manufactured by Sapphire. SKU 21260-00.

 

[Joxeon]

T'was a reference Radeon 8GB model, manufactured by Sapphire. SKU 21260-00.

I was going to suggest flashing the vbios to a 580 but since you've replaced it with a 580 now and it's working fine then there is no need but maybe something to try for anyone else with the same issue.