Question My 650w PSU only has a 6-pin for GPU ?

[rx570user]

I have this FSP 650w 80+ Bronze PSU. I use it with an RX 570 which only needs a single 6-pin.
I wanted to upgrade the GPU to maybe a 1080 Ti but that needs a 6-pin and an 8-pin.

Here's a picture of the specs. I have 4 extra molex connectors and an extra CPU 4-pin. Should i use a molex to 6-pin or 8-pin connector if I want to get a 1080 Ti?

 

[Lutfij]

Welcome to the forums, newcomer!

Thumb rule, if your PSU lacks the necessary connectors for your components in your build you either have;
a| the wrong PSU for the job
or
b| the wrong components for your build.

If you look around the www, you'll see that the main cause of fires are adapters. How old is your PSU anyway?

I have this FSP 650w 80+ Bronze PSU.
FYI, that PSU is 600W at most, not 650W.

Looking a the mechanical drawings, you should be having a 6+2pin connector stemming from the PSU, labelled P4 on the harness connector;
https://www.fsp-ps.de/download/pro/FSP600-80PSA(SK)_Datasheet.pdf
which would lead me to suggest looking at GPU's that need a single 8pin connector.

 

[rx570user]

Its like 3 or 4 months old

 

[DSzymborski]

Its like 3 or 4 months old

That's an *old* model, designed for PCs from 20 years ago (you can tell from the group-regulation and the rail configuration). That's cheap office PSU territory if they're actually still making these. I would only use an adapter to power a 1080 Ti if I were unconcerned about the GPU dying or a computer fire.

 

[rx570user]

If thats the case i guess i will change. Any budget recommendations?

 

[Grobe]

Ok - I just tested this myself since I have this exact plug combination myself. There should be no problem plugging a 6 pin plug into a 8 pin socket, because in one corner, the first contact (+12V) are square so that you cannot put it the wrong way, even if you have a 6 pin plug.

The only possible issue indicates that a PSU with 6 pin 12V connector may have lower speccs compared to a PSU having a 8 pin 12V connector - just an indication, it may just work completely good in your case.

 

[--SID--]

You don't want to power a 1080 Ti with a junk group regulated PSU like that. It's a bad unit because the voltage regulation is horrible and it lacks essential protection features.

 

[JayGau]

Ok - I just tested this myself since I have this exact plug combination myself. There should be no problem plugging a 6 pin plug into a 8 pin socket, because in one corner, the first contact (+12V) are square so that you cannot put it the wrong way, even if you have a 6 pin plug.

The only possible issue indicates that a PSU with 6 pin 12V connector may have lower speccs compared to a PSU having a 8 pin 12V connector - just an indication, it may just work completely good in your case.

It may just work, or it may burn down the house. He already has a crappy PSU and you tell him he should connect a 6-pin cable in a 8-pin socket? The only right answer should be "replace this junk PSU asap".

 

[Grobe]

The only right answer should be "replace this junk PSU asap".

Yes, I agree of course - just some bad choice of wording in my latter post ; I just wanted to point out that the connector is backward compatible, but not as an advise to use that specific PSU 😳

 

[Misgar]

There should be no problem plugging a 6 pin plug into a 8 pin socket,

Unfortunately although you might be able to make the connection, the 6-way cable is rated at only 75W whereas the 8-way cable is rated at 150W. It may seem illogical, but that's the official ATX PCIe spec. Some GPUs can detect when two pins are not terminated and may refuse to power up.

For more info, see this document.

https://pcpartsgeek.com/can-you-use-6-pin-into-an-8-pin-gpu/