Question Very odd boot behavior on three identical x399 Taichi/Threadripper 2990WX builds.

[Jawknee530]

This last week I built three identical builds.

• Threadripper 2990WX
• ASRock X399 Taichi sTR4 : 3.30 Bios
• G.SKILL Trident Z RGB (For AMD) 32GB F4-3200C14Q-32GTZRX: 3200 14-14-14-34 XMP
• EVGA SuperNOVA 1300 G2
• SAMSUNG 970 EVO
• Dual Nvidia Quadro P1000s in PCIe slots 1 and 4 (the 2 x16 slots)

The odd issue is that every time I boot any of the three machines after they've lost access to power it takes three tries.
1st: lights come on, fans spin up, then it cuts off after just a few seconds
2nd: everything comes up, Dr Debug starts cycling through it's thing, then everything cuts off after maybe 15 seconds
3rd: boots properly
This only happens after a fully cold boot where the machines has been unplugged or the psu switch has been flipped off. The machines all boot normally after this first little dance. This happens whether the ram is at 2133 stock or under the XMP profile at 3200.
BIOS Settings:

• CPU at stock frequency and voltages
• SMT disabled
• Precision Boos Overdrive disabled
• SVM Mode disabled
• IOMMU disabled
• All other settings default

I get the same behavior regardless of these settings, these are just the current ones.

 

[kanewolf]

If it is happening on three similar motherboards, and is happening consistently, it may be a BIOS bug. Since the two graphics cards aren't required to boot, what happens if you remove one of the graphics cards and try the cold boot?

 

[Jawknee530]

If it is happening on three similar motherboards, and is happening consistently, it may be a BIOS bug. Since the two graphics cards aren't required to boot, what happens if you remove one of the graphics cards and try the cold boot?

Same behavior with a single card.

 

[kanewolf]

There are two newer BIOS versions available for that motherboard. P3.50 is available in the support forum. The Asrock boards are good about being able to update the BIOS directly via ethernet from withing the BIOS displays. I would probably update ONE to see what happens.

 

[Jawknee530]

There are two newer BIOS versions available for that motherboard. P3.50 is available in the support forum. The Asrock boards are good about being able to update the BIOS directly via ethernet from withing the BIOS displays. I would probably update ONE to see what happens.

I hadn't seen the 3.5, only the other minor one. I'll give that a try, do you have a link by chance?

 

[kanewolf]

I hadn't seen the 3.5, only the other minor one. I'll give that a try, do you have a link by chance?

https://www.asrock.com/MB/AMD/X399 Taichi/index.asp#BIOS

I would recommend just jumping into the BIOS with the ethernet connected to a DHCP server with internet access and letting the motherboard find the update.

 

[Jawknee530]

https://www.asrock.com/MB/AMD/X399 Taichi/index.asp#BIOS

I would recommend just jumping into the BIOS with the ethernet connected to a DHCP server with internet access and letting the motherboard find the update.

Thanks, won't be able to try it til tomorrow but will update after.