Hi,
I have an Maximus VIII Hero that the 2nd pcie slot didn't recognized anything. There's the full system specs:
-Maximus VIII Hero motherboard
-Intel core i7 6700K
-16GB RAM G-Skill 3200mhz
-Corsair RM650 PSU
-Nvidia Geforce GTX 1070 (X16 slot)
-GPU tryied on the 2nd slot: EVGA Geforce GTX 660, Sapphire pulse RX580, Powercolor RX 5700xt
The first pcie slot work fine, without any issues, whit any gpu. The X8 slot didn't recognize anything. Here's what i've tryied:
-First, read the motherboard specs and user manual to be pretty sure that this board can accept 2 GPU, this is the case
-Clear the cmos, didn't touch any bios setting: Not recognized
-Put PCIE to Gen1, activate above 4G decoding, didn't work
-Remove PSU cable from the gpu, power on the pc to confirm that the fan spin, this is the case, so there's power inside the pcie slot.
-Tryied to put 2nd gpu on the X4 Slot (chipset) that work
-GPU isn't recognized in the bios, and on the os (Both linux and windows)
-All of my gpu is working pretty fine on the first slot and the x4 slot, and in other computer
In the bios and manual, they said to use X8 slot for a 2nd gpu, but that didn't work. I'm doing computer troubleshooting and fix since many years but this one, i can't find the issue, so any help would be appreciated. I have an older board (P8Z77-V Deluxe) and this board accept any gpu on the 2nd slot. I didn't understand why a cheaper and older board accept it, but not this one.
Thank you