Question Is it ok to only use 2 cables to power all 3 8-pin connections on GPU?

dmavro

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I have a MSI Radeon RX 6800 XT Gaming Z Trio and was wondering if it would be ok if i used 2 connections on 1 cable and then 2nd cable for my 3rd connection? I saw a lot of posts online but most refer to GPU's with only 2 power connections. I also saw a few that said it was ok if your PSU was higher end but those were also referring to dual connection GPU's. Not even sure if my PSU falls into the higher end category. Im using a Corsair HX1200 in the build with an i9-12900k. Im not OC'ing anything in build yet but might down the road.
 

dmavro

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should work see if it does better in single or multiple ouput with the switch on psu .
Thanks for reply. Was going to ask about Single or Multi switch next. If i have issue with whatever setting i set switch to will most likely result be a blank screen? Just dont want to damage a $800 GPU.
 

dmavro

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Thanks for responding guys. I ran it with 2 and it worked fine. I'll run the 3rd one anyway. Better off being safe than sorry. The cables that came with PSU are very stiff and seem thicker than ones ive previously gotten with prior PSU's which was one of the reasons i went with 2 originally. Guess i was being lazy also.

Thanks again.
 
You'll be fine using 2 cables for the 3 connectors on the GPU.
Always use the cables that came with the PSU.
The multi/single switch won't shouldn't make a difference with regards to performance and stability. The only thing it may offer is better over current protection.
 

geofelt

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Since you have three cables, one for each of your three 8 pin gpu ports, use all three. A minor cable management problem.
The HX1200 installation manual does not show any restrictions to using two 8 pin connectors on a single cable.

That said, on my Seasonic psu, the instructions do suggest to not use the second connection for 8 pin, but only for a second 6 pin connection.
 

dmavro

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I am using cables that came with PSU and I plan on running 3rd cable for GPU right after i figure out my DDR5 Ram/mobo issue. Thanks for your input!
 

Karadjgne

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It's a question of power. Each pin on pcie is rated at 5A. That's 60w. So a 6pin is capable of 120w, an 8pin is capable of 180w.

However, that 5A gets shared when using jumper connectors, so single cable with a 6pin and 8pin on it are going to see an issue if needing to pull the entire 225w gpu rated as 2 of those wires will be at the same 60w pin, regardless of wire size being capable of sustained 300w.

Better to use 1 wire per connection, unless gpu TDP is lower than combined connections.
 

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