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My friend helped me build my computer in 2014 (by help I mean did pretty much everything) so I don't know very many technical things about this machine. Today I took out my R9 290 to clean a little dust out of the fans and put it back, but when I played some games I realized I could barely handle low settings when I could easily handle high earlier. I went into BIOS and saw on the motherboard there wasn't anything detected in the space where my GPU was connected. Now I see the graphics card I'm using is Intel HD Graphics 4600 which explains the ****** performance.

What I'm not sure about are the PCI-E connectors for the R9. It seems the only thing that works is connecting a 6 pin and another 6 pin, but there's 8+6 spaces in my GPU. When I try to connect 6+8, my monitors won't work for some reason but I hear the windows start up sound. However if I boot up my computer using 6+6, insert 2 more pins while my computer's running, and restart, the monitor will work. As soon as I plug in those last 2 pins though, my PSU (Corsair CX600W) fan starts blowing really loudly.

So my question is: For connecting my CX600W to my R9 290, am I supposed to use 6+8 or 6+6? And if it's not the PCI-E problems, what else can I try?
 

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My friend helped me build my computer in 2014 (by help I mean did pretty much everything) so I don't know very many technical things about this machine. Today I took out my R9 290 to clean a little dust out of the fans and put it back, but when I played some games I realized I could barely handle low settings when I could easily handle high earlier. I went into BIOS and saw on the motherboard there wasn't anything detected in the space where my GPU was connected. Now I see the graphics card I'm using is Intel HD Graphics 4600 which explains the ****** performance.

What I'm not sure about are the PCI-E connectors for the R9. It seems the only thing that works is connecting a 6 pin and another 6 pin, but there's 8+6 spaces in my GPU. When I try to connect 6+8, my monitors won't work for some reason but I hear the windows start up sound. However if I boot up my computer using 6+6, insert 2 more pins while my computer's running, and restart, the monitor will work. As soon as I plug in those last 2 pins though, my PSU (Corsair CX600W) fan starts blowing really loudly.

So my question is: For connecting my CX600W to my R9 290, am I supposed to use 6+8 or 6+6? And if it's not the PCI-E problems, what else can I try?
Word of advice: never, ever connect power to a GPU while the computer is running or plugged in to mains power. The same applies for just about any other component, even if it's said to support hot swapping. You can fry expensive parts if you do this. Always turn off the system and unplug its power supply before opening the case and working with anything in there.

Your GPU requires both the 8-pin and 6-pin PCI-E power connectors for it to work, assuming you haven't fried it already.
 
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