Question <SOLVED> Dodgy PCie slot - x8 gpu works but not x16 gpu

[Rhubarbz]

<SOLVED>
I've had a motherboard for a while that has had a problem...

The top PCIE x16 slot works with an old GT 710 (pcie 2.0x8 runs @x8) but not a gtx 1650 (pcie3.0x16).

• Both gpus work
• Chipset x16@x4 slot works with both
• GTX 1650 does not have power connectors I doubt it is a psu issue
• BIOS does not even detect GTX1650 but does GT710
• Running gtx 1650 on chipset slot and GT710 on dodgy x16 slot, both are detected, but not vice versa.
• No video at all when 1650 in top slot and VGA error light (no boot)
• If 1650 in top slot but 710 in bottom no errors but 1650 not recognised by bios or windows

I suspect this is a dead lanes issue but the mb is out of warranty so any provisional fixes would be appreciated

Specs are as follows:
- 16gb ddr4 3200 2x8gb
- ryzen 3800x
- GTX 1650 / GT 710
- MSI mb X570 gaming edge wifi




SOLUTION:

• The fact the GT710 that was wired x8 worked led me to believe there was something wrong with the rest of the pins in the x16 slot
• So I used masking tape to tape the extra unused pins on the GT710's pcie connector to see if it would then still work in that slot.
• And so it worked...
• I did the same with the GTX1650 so it would only connect in x8 (leaving 57 pins on each side untapped) to bypass the faulty pins in the slot
• this worked

solved by using masking tape on gpu's pcie connector where the motherboard's faulty pins extended to

Hope this helps someone instead of them having to figure it out by themselves like I had to

 

[rgd1101]

brand and model of the psu?

 

[Rhubarbz]

brand and model of the psu?

Cooler master 850w
psu is not the problem as 1650 was in bottom slot and worked fine