Question Windows 7 only boots with specific GPU

[AsierMR]

Hi there:

This week I switched my GPU from an RX 6600 to a GTX 1070 and Windows 7 became stuck in a bootloop, where it would play the startup animation to about halfway through, and then inmediately restart.

I tried resetting the CMOS and uninstalling the previous GPU drivers via DDU, but the PC would only boot with the RX 6600 installed. I even tried a RX 580 GPU, but it wouldn't boot either.

I really need to use Windows 7, so upgrading to 10 is not an option. Any help would be greatly appreciated.

My specs:
Motherboard: Asus Prime B450M
CPU: Ryzen 5 5600G
GPU: RX 6600 (RX 580 and GTX 1070 won't boot)
RAM: 2 x 8gb DDR4
PSU: EVGA 850W

 

[punkncat]

The 6600 is the faster card anyway, why downgrade?

I am curious as to what this could be. I would figure a driver issue or something, but sort of doesn't make sense that it would boot on the newer card. Hopefully someone has an idea on that.

 

[AsierMR]

The 6600 is the faster card anyway, why downgrade?

Mainly because I need to use CUDA for specific apps.

My only guess would be that it's a motherboard problem, but I don't currently have another one to test.