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Can’t start my ASUS RTX 3090 card with WRX80 MB

Hello, everybody!
My PC don’t wanna even start with ASUS RTX 3090 Gundam series. When I put my friend’s ZOTAC RXT 3090 – all fine.
Where problem can hide? Please, help.

My current config is:
MB: Pro WS WRX80E-SAGE SE WIFI
CPU: Ryzen Threadripper PRO 3995WX
RAM: G.Skill F4-3600C18D-64GTRS (8×32 GB)
PSU: Corsair AX1600i
Video: 4 x ROG-STRIX-RTX3090-O24G-GUNDAM

Errors, that I have:
Reset, no display cables – QC=AA (no image)
Cold boot, DP connected – QC=94
Clear CMOS, DP connected – QC=94
Cold boot, no GPU power connectors, DP connected – QC=02
Cold boot, HDMI connected – QC=62

Note:
Before all test I left only 1 RAM bar, only 1 GPU, no drives, no riser, clear CMOS, latest BIOS, cables and slots reconnected and reseated.
This PSU have 1600W at 12V power channel. MB have extra PCI-ex power. Current GPU have 3 slots of 8-pin.
If I put another 3090 by ZOTAC with 2 slots of 8-pin – all working fine.
All 4 pcs. of ROG-STRIX-RTX3090-O24G-GUNDAM have same effects.
There is no model of my RAM in supported list of MB, but all working fine, just with low frequency and with low power. Current RAM 1.35V, supported RAM 1.2V.

Topic

I’ve read tales like this regarding the threadripper series.

In reply to Can’t start my ASUS RTX 3090 card with WRX80 MB

Back to the motherboard maker AFTER you test the failing 3090 in another PC.

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