I'm currently building using the EVGA RTX 2060 Super SC and it has one 8-pin power connector. The only PCIe 8-pin cable that came with my Seasonic PSU modular only shows 6-pin's to be active. Is this the correct cable to use?

Most seasonic will be an 8 pin that plugs into the powers supply and the other end should be the 6, 8, or 6+2 pin PCIe connections. They should be labeled.

Can you tell us the model of that Seasonic PSU
 
cross posted
 
Seasonic Focus GX-550 80 Plus Gold
 
https://seasonic.com/pub/media/pdf/consumer/datasheet/FOCUS-PLUS-Gold-FX.pdf
 
https://seasonic.com/focus-plus-gold
 

According to the specs and photos it shows it has 2 PCIe connection cables included, both are 8 pin for the power supply side and 6+2 pin for the video card end. Are you saying all the wires are individual metal ends instead of being in a single plug?

PSU Mfg .... Custom wire Their power cords.... so that the PSU (which is Not standardized) ... can be Safely Joined to the Device end - (Whis Is Standardized)

007vsMagua

altonadavid
According to the specs and photos it shows it has 2 PCIe connection cables included, both are 8 pin for the power supply side and 6+2 pin for the video card end. Are you saying all the wires are individual metal ends instead of being in a single plug?

If you look into the ends my PCIe power cord, the end that goes into the GPU has two parts and all 8 ports show a metal connection. The end of the 8-pin power cord that gets plugged into the PSU only shows 6 ports with a metal connection. The cord is labeled PCI-E RG33. I guess my question is_ Do all eight power connections on my card need power? Or does it only need six?

The end with 6+2 you just put them together and then all 8 plug into the video card. Then the other end plugs into the powers supply port marked PCIe

I think you're ok.  I was initially confused as well about this when I got my full length custom cables for my Seasonic Prime series.  After looking up the pinouts it made sense.  Only 3 lines are actually power on the connector.  The rest are grounds.  On the GPU end Seasonic is splitting one wire into 2 pins on the grounds in two spots.  Just means for whatever reason they were able to meet the needed spec without connecting up all 8 pins on the PSU end of things.
 
Edit:  So if you look closely at both ends of the cable you should see either on the GPU end that 1-2 wires are split into two pins or on the PSU end that 1-2 pins that are split into 2 wires. 
 
edit 2:  So if I'm remembering the PCIE pinout correctly, 6 pin is actually 2 power 4 ground, and 8 pin adds one extra line of each for 3 & 5.
 
edit 3: Actually those extra +2 pins are just ground.  Weird, but yeah.

flyinion
I think you're ok.  I was initially confused as well about this when I got my full length custom cables for my Seasonic Prime series.  After looking up the pinouts it made sense.  Only 3 lines are actually power on the connector.  The rest are grounds.  On the GPU end Seasonic is splitting one wire into 2 pins on the grounds in two spots.  Just means for whatever reason they were able to meet the needed spec without connecting up all 8 pins on the PSU end of things.
 
Edit:  So if you look closely at both ends of the cable you should see either on the GPU end that 1-2 wires are split into two pins or on the PSU end that 1-2 pins that are split into 2 wires. 
 
edit 2:  So if I'm remembering the PCIE pinout correctly, 6 pin is actually 2 power 4 ground, and 8 pin adds one extra line of each for 3 & 5.
 
edit 3: Actually those extra +2 pins are just ground.  Weird, but yeah.

Yeah, it does seem weird. It does seem the six plug side has 3 hot wires and 3 ground connections. I assume the card only needs 3 hot wires.

flyinion

007vsMagua

flyinion
I think you're ok.  I was initially confused as well about this when I got my full length custom cables for my Seasonic Prime series.  After looking up the pinouts it made sense.  Only 3 lines are actually power on the connector.  The rest are grounds.  On the GPU end Seasonic is splitting one wire into 2 pins on the grounds in two spots.  Just means for whatever reason they were able to meet the needed spec without connecting up all 8 pins on the PSU end of things.
 
Edit:  So if you look closely at both ends of the cable you should see either on the GPU end that 1-2 wires are split into two pins or on the PSU end that 1-2 pins that are split into 2 wires. 
 
edit 2:  So if I'm remembering the PCIE pinout correctly, 6 pin is actually 2 power 4 ground, and 8 pin adds one extra line of each for 3 & 5.
 
edit 3: Actually those extra +2 pins are just ground.  Weird, but yeah.

Yeah, it does seem weird. It does seem the six plug side has 3 hot wires and 3 ground connections. I assume the card only needs 3 hot wires.

I did a bit more looking.  Apparently what really happens is in the 8 pin config the GPU end moves the ground from one of the original locations in the 6 pin to the two extra pin section and then re-purposes that original location in the 6 pin area and the last remaining of the +2 section as "sense" wires so that it can tell whether an 8 or 6 pin connector is installed and change its power mode appropriately.  

Thanks man, happy Thanksgiving

GTXJackBauer
Don't worry too much since the cables have different shapes so you can't input the cable in the wrong way.

He was concerned about that fact that the seasonic cables don't have wires in all the connector pins on the PSU side.  I had noticed the same thing a couple months ago when I swapped out my stock PSU cables for some cablemods custom ones and was initially worried that they hadn't put wires to all the pins and some were Y'd off of one.  That was when I found those pinouts etc. and realized it wasn't an issue.

No, all PSU's are not the same.  Don't mix cables from different manufacturers.

davevt31
No, all PSU's are not the same.  Don't mix cables from different manufacturers.

bdary

davevt31
No, all PSU's are not the same.  Don't mix cables from different manufacturers.

+1.  Even different PSU's from the same Mfg'r can be pinned different.  Never a good idea to swap cables...

OK, Thanks. Both my EVGA and Seasonic PSU's are modular and I would have thought the cables would be universal.

flyinion

007vsMagua
 
OK, Thanks. Both my EVGA and Seasonic PSU's are modular and I would have thought the cables would be universal.

Definitely not.  It's only universal on the component connection side.  That's why when you get full replacement cables you need to select them by what brand and model PSU that you have.

Alrighty Then, I do remember when I ordered my custom cables they were for the 850 G3. I'll let sleeping dogs lay and not use different cables.