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 2021-01-16, 15:28 #1 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 5×727 Posts ATX Power Supply Please forgive my possibly too ignorant state. I am trying to see if I can replace a power supply in any of my systems to include one that can power a GPU. None of my current systems have the extra lines form the supply. For example, a Tesla K80 needs to be supplied with at least a single 8-pin connector (if rated high enough) or two 8-pin connectors via an adapter cable. In my research of power supplies for ATX systems, I'm finding different ones with several 4 pin connectors, but some of those don't appear to include the standard(?) 4-pin 12V for the motherboard. To complicate things, some of my motherboards use the 6(8)-pin connector themselves which leaves none for a GPU. Can the power supplies with multiple 4-pin connectors be used by placing two 4-pin supply connectors into the 8-pin GPU connector? Thanks for any help.
 2021-01-16, 16:39 #2 paulunderwood     Sep 2002 Database er0rr 2·3·599 Posts Buy a new capable modern efficient PSU Last fiddled with by paulunderwood on 2021-01-16 at 16:39
2021-01-16, 16:45   #3
Viliam Furik

"Viliam Furík"
Jul 2018
Martin, Slovakia

5·79 Posts

Quote:
 Originally Posted by EdH Please forgive my possibly too ignorant state. I am trying to see if I can replace a power supply in any of my systems to include one that can power a GPU. None of my current systems have the extra lines form the supply. For example, a Tesla K80 needs to be supplied with at least a single 8-pin connector (if rated high enough) or two 8-pin connectors via an adapter cable. In my research of power supplies for ATX systems, I'm finding different ones with several 4 pin connectors, but some of those don't appear to include the standard(?) 4-pin 12V for the motherboard. To complicate things, some of my motherboards use the 6(8)-pin connector themselves which leaves none for a GPU. Can the power supplies with multiple 4-pin connectors be used by placing two 4-pin supply connectors into the 8-pin GPU connector? Thanks for any help.
There are two types of 8-pin connectors...

The first type of 8-pin is 4+4, used for CPU power, plugged into the motherboard. The second type is 6+2, used for mainly the GPUs, but can be used for other compatible devices. AFAIK, the won't even fit into each other, because the pin casings are different -> different arrangement of square ones and square with two adjacent corners cut down.

If you still need help, please, send some pictures.

2021-01-16, 16:57   #4
tServo

"Marv"
May 2009
near the Tannhäuser Gate

613 Posts

Quote:
 Originally Posted by EdH Please forgive my possibly too ignorant state. I am trying to see if I can replace a power supply in any of my systems to include one that can power a GPU. None of my current systems have the extra lines form the supply. For example, a Tesla K80 needs to be supplied with at least a single 8-pin connector (if rated high enough) or two 8-pin connectors via an adapter cable. In my research of power supplies for ATX systems, I'm finding different ones with several 4 pin connectors, but some of those don't appear to include the standard(?) 4-pin 12V for the motherboard. To complicate things, some of my motherboards use the 6(8)-pin connector themselves which leaves none for a GPU. Can the power supplies with multiple 4-pin connectors be used by placing two 4-pin supply connectors into the 8-pin GPU connector? Thanks for any help.
I looked at the K80 power supply cables available on Ebay at the 8 pin male power end is unique to Tesla. It is NOT the same as a standard PCIE 8 pin.
I think that the cables for the mother board WILL NOT WORK in a GPU and vice versa.
Paul Underwood's post has good advice .William Furtik's is correct.
If you're not careful, you could fry your motherboard and everything on it and/or wreck your GPU.

2021-01-16, 16:59   #5
EdH

"Ed Hall"
Dec 2009

E3316 Posts

Quote:
 Originally Posted by paulunderwood Buy a new capable modern efficient PSU
This is my hope, but the connectors are confusing me.

Quote:
 Originally Posted by Viliam Furik There are two types of 8-pin connectors... The first type of 8-pin is 4+4, used for CPU power, plugged into the motherboard. The second type is 6+2, used for mainly the GPUs, but can be used for other compatible devices. AFAIK, the won't even fit into each other, because the pin casings are different -> different arrangement of square ones and square with two adjacent corners cut down. If you still need help, please, send some pictures.
Thanks! This will help in my studies.

2021-01-16, 17:13   #6
paulunderwood

Sep 2002
Database er0rr

2·3·599 Posts

Quote:
 Originally Posted by EdH This is my hope, but the connectors are confusing me. Thanks! This will help in my studies.
As has been said, they 8 pin CPU plug is not interchangeable with the GPU ones. If your board uses only 4 pins for the CPU feed then make sure to get a 4+4.

2021-01-16, 19:27   #7
EdH

"Ed Hall"
Dec 2009

5×727 Posts

Quote:
 Originally Posted by paulunderwood As has been said, they 8 pin CPU plug is not interchangeable with the GPU ones. If your board uses only 4 pins for the CPU feed then make sure to get a 4+4.
Thanks! That helps me figure this out.

 2021-01-17, 13:48 #8 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 5×727 Posts I believe I have found a supply with connectors to cover all examples. It's 500 watts: Code:  Drive/Power Connectors Modular - - - - - - Non-Modular ATX Connector - - - 20+4-pin ATX 12V Connector - 1 x 4+4-pin Graphics Connector- 2 x 6-pin, 2 x 6+2-pin Molex Connector - - 3 SATA Connector- - - 6 Power Specifications PFC - - - - - - - - Active Rating- - - - - - - 80 PLUS Certified Energy Efficiency - > 80% Typical Are there any things I've missed, or not considered and should? Thanks for all the help!
 2021-01-17, 16:25 #9 chris2be8     Sep 2009 5×401 Posts Looking round http://www.hardwarebook.net/ you should be able to find pictures of every type of connector. And details of what they are used for. Chris
2021-01-17, 16:42   #10
preda

"Mihai Preda"
Apr 2015

101001111112 Posts

I would recommend to get a 850W or at least 750W PSU, Gold 80+, and modular or semi-modular. Maybe read some reviews of the model before buying. The reason is: you have some power headroom (to 850W), and Gold 80+ [semi]modular tend to be higher quality, and generate less heat and noise.

Quote:
 Originally Posted by EdH I believe I have found a supply with connectors to cover all examples. It's 500 watts: Code:  Drive/Power Connectors Modular - - - - - - Non-Modular ATX Connector - - - 20+4-pin ATX 12V Connector - 1 x 4+4-pin Graphics Connector- 2 x 6-pin, 2 x 6+2-pin Molex Connector - - 3 SATA Connector- - - 6 Power Specifications PFC - - - - - - - - Active Rating- - - - - - - 80 PLUS Certified Energy Efficiency - > 80% Typical Are there any things I've missed, or not considered and should? Thanks for all the help!

Last fiddled with by preda on 2021-01-17 at 16:42

2021-01-17, 16:55   #11
EdH

"Ed Hall"
Dec 2009

5·727 Posts

Quote:
 Originally Posted by chris2be8 Looking round http://www.hardwarebook.net/ you should be able to find pictures of every type of connector. And details of what they are used for. Chris
Thanks, but that page does not work for me. Clicking the ATX Power Supply link on the initial page gets a 404 error page and then I can't get back to the original page until I reload my browser.

I did find some images elsewhere and the posts in this thread have really helped.

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