Does the ASUS ROG Crosshair X670E Hero support the Sapphire Pulse AMD Radeon RX 7900 XTX GPU?

[SaintBernardFan]

I built a PC with the motherboard specified in the topic subject and when I inserted the graphics card specified in the subject into both PCIe slots, I boot the PC and it does not power on at all.

However, when I unplug the three PCI cables that came with my Corsair RM1200x Shift PSU from my graphics card, my PC boots into UEFI successfully and everything works without the GPU.

My brother suggested I get a better power supply with more wattage, but, I don't know if that would make a difference.

I have a feeling this motherboard does not support my graphics card.

This graphics card is HUGE and takes up a lot of space and the wires that connect to other ports on the motherboard can get in the way, whether I plug it in the first or second PCIe slot.

It is 313 mm, I believe and the case allows for 450 mm.

[gupsterg]

I run a Merc XTX on a EVGA G6 850W, system has PBO OC 9800X3D on X670E Hero, 9x120mm fans, 2x140mm fans, 1x D5 pump, 2x NVMe, 2x SATA SSD.

So I'd say 1200W is more then ample. I'm currently running folding@home on my system and wall power plug meter shows max 700W including screen. Screen is ~30W, so rig is drawing about 670W MAX.

Decent PSU like you have is rated DC side ie components. Lets say efficiency is ~90%, that would mean my 670W MAX figure from wall socket is about ~603W MAX components side power draw.

From the way you state you unplug power cables to Pulse and PC shows display, have you got the monitor cable plugged into rear of motherboard HDMI port? if in the HDMI port on motherboard remove cable and place in GPU port and then power up PC.

If you use motherboard HDMI port that is for CPU iGPU.

[SaintBernardFan]

When I plugged the HDMi cable to the GPU when it was connected to the power supply, it would not power on.

When the graphics card was unplugged and I connected the HDMI to the motherboard, it worked.

So, I am figuring out why my PC will not boot with the graphics card connected.

[gupsterg]

What motherboard BIOS version are you on?

You are using the PCI-E cables which are single plug cables?

When you use Pulse, does Q-LED stick on VGA? what is Q-Code?

Pulse XTX is known good card? ie working?

[Zheega]

It works when you unplug the PCIe power cables, but when you plug them back in there is no power at all?

This leads me to believe you are using the wrong power cables (maybe used for another very similar PSU, even from the same brand!) or that you plugged them wrong. Zero response to the power button means the PSU is protecting itself from a big wiring problem.

[Silent_Scone]

Test with another PSU if possible. 

Ensure the GPU VBIOS is up to date. May obviously require that the GPU is installed into another system.