B450 Tomahawk Max - Upgrading to 5000 series. Don't use the beta bios!

[The Artfull Bodger]

Just wanted to let others know who have B450 tomahawk max boards and are looking to throw in a 5000 series chip. Don't use the most recent beta bios, just spent a couple of hours fault finding as although my 3600 worked fine, my Pc wouldn't even power up (with the exception of usb's) with a 5000 series. It also wouldn't let me flash the bios via usb with the cpu installed. Suffice to say, it's now up and running, but I have exhausted my supply of thermal paste and sanity in the process!

 

[The Artfull Bodger]

I have a B450 Tomahawk Max with the latest Beta BIOS (7C02v3B2), works just fine for me with a 5600x.

Can't explain it, but 7C02v3B2(Beta version) definitely wouldn't boot or power up for my 5900x, worked fine with 3600.

Hasn't that always been the case, that you are supposed to have only the power supply connected, nothing else. For bios flashback method on MSI.

Sorry should have been more clear, the issue was I had to keep removing the cooler and cpu to retry the beta bios/install the previous 7C02v3A version. I have flashed the bios previously with the 3600 installed with this method numerous times ok, so it can be done, its just the beta bios (i'm guessing) didnt recognise the cpu which prevented this.

 

[The Artfull Bodger]

Maybe the issue was from fitting the 5900X rather than the bios

Updated the bios to the beta with 3600 in it originally days before and probably reseated the 5900x at least 3 times on that bios, including a fresh install and CMOS reset. Soon as I popped the 3600 back in on the beta powered up. Installed previous version popped 5900 in and once again powered up. So why not impossible highly unlikely that it was the CPU and not the bios. I also checked all PSU connections, case power switch was working and backed off cooler screws in case overtightened.
Anyways it's working and I'm experiencing no issues, planning on having this setup for a long time so can't be bothered buying more thermal paste, finished off my kryonaut and two tubes of noctua paste already

 

[The Artfull Bodger]

Did you clear CMOS after installing the 5900X

Yeah, took the battery out for a few mins to clear, was the first thing I did.

 

[The Artfull Bodger]

Seems a little bit ridiculous pairing a £740 CPU with a £90 motherboard but I can't see any benefit from upgrading it.

Perfectly agree, they are cracking little boards for the money and I was already using a
Noctua NH-C14S top flow cooler so hopefully should help keep vrms nice and cool.