ATX 3.0 power supply problems on EATX motherboards
ATX 3.0 power supply problems on EATX motherboards
First off i want to say this: Yes, I am stupid. What i am doing is dumb, but sometimes dumb is fun. I bought a A750 for $150 on black friday and i am trying to put it into my existing gaming rig. (pc part picker below) I want to run my secondary monitors off this card and just game on my rtx 2080. This is a dumb experiment i know. Ok now for the problem: so I had a nice EVGA SuperNOVA 650 P2 power supply but it would not have the power to drive both cards. I went to microcenter and picked up a 850W Seasonic power supply (listed in PC part picker below). This is a ATX 3.0 power supply though so I had to change basically all of my cables. I got the swap all done with everything plugged in correctly.....no post. no lights NADA. eventually i realized that the pinout on my 24 pin is different on the power supply side. (I had swapped it for the new one anyways) Everything I am reading online says that this should be the same. I was able to plug the old cables into the old power supply and confirm that the components are not dead. What gives? Is the new 24 pin different? PC sepcs: https://pcpartpicker.com/list/Ct6WBL
Using outdated cables and connecting them to a new power supply that wasn't properly secured could damage components. Restore the device to its original setup to check functionality. Note: A secondary 2D monitor typically needs minimal GPU power, so your 2080 should have handled it fine without noticeable performance changes. In fact, most GPUs from the past ten years can display a second 2D monitor smoothly regardless of age or cost.
I consulted Duckduckgo and found the pin configurations vary significantly on the PSU side.