MP 1,1-5,1 RX5700 Upgrade

[andysa1966]

Upgrading from a RX580, Ive acquired an ASUS RX5700 (looks the same as 2 slot reference card), was looking out for a Sapphire that appears to be the same card. It requires and 8 and 6pin auxiliary power.

From reading other posts I think I've got the power requirements covered?

Ive done a pixla cable mod supplying one 8pin auxilary power plug providing ≤150W

For the 6pin I have modded a spare dual mini 6pin to 8pin cable, replaced the 8pin plug with a 6pin so its six 12v into three and six ground into three, I assume this will be ok (2 x 75W) ≤150W more than the 75W required.

I shouldn't need an EVGA PowerLink?

 

[Matty_TypeR]

when you did the Pixlas mod you should have used a dual 8 pin cable that also can be used as dual 6 pin or single 8 + 6 pin cable. that way if later you were to fit a dual 8 pin card like 6800xt or dual 8 pin plus single 6 pin you could have used the single mini 6 pin on logic board for the extra 6 pin required for 2 x 8 + 1 X 6 gpu.

 

[andysa1966]

thank you for your insight, I would have gone that route if needed, however Ive no plans to upgrade the GPU further, I chose this gpu because of its performance relative to its power requirement, TDP 180W vs 185W of the RX580. It'll do for me.

 

[andysa1966]

Arrived this morning, installed, OC picker shows, Big Sur and W10 booting no issues

 

[andysa1966]

I was surprised that Mojave booted also, I thought that this card was not supported and wouldn't post, it doesn't identify correctly in system report, but still it boots for recovery use?

 

[tsialex]

I was surprised that Mojave booted also, I thought that this card was not supported and wouldn't post, it doesn't identify correctly in system report, but still it boots for recovery use?

There are no drivers for NAVI GPUs before Catalina 10.15.1, so when you boot Mojave the display is unaccelerated and works via OpenCore GOP support and Apple EFI drivers. While you can't work, it's useful for diagnostics.

If you boot Mojave without OpenCore, the display is not going to work.

 

[andysa1966]

There are no drivers for NAVI GPUs before Catalina 10.15.1, so when you boot Mojave the display is unaccelerated and works via OpenCore GOP support and Apple EFI drivers. While you can't work, it's useful for diagnostics.

If you boot Mojave without OpenCore, the display is not going to work.

Thanks for clarifying, I’m keeping the rx580 just for Mojave rescue environment.

One other question I had with you in mind, should the nvram be reset after hardware changes? Gpu, ram modules and processor tray

 

[tsialex]

Thanks for clarifying, I’m keeping the rx580 just for Mojave rescue environment.

One other question I had with you in mind, should the nvram be reset after hardware changes? Gpu, ram modules and processor tray

Yes, after any CPU and RAM related changes, including changing a DIMM from one slot to another.