Dual psu tech tips | Linus Tech Tips | Page 1

gritty rock Jun 15, 2025, 5:10 AM

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I’m trying to install gtg 1660 super in an hp prodesk 600 g1 sff and I’m having some trouble with power supply. I bought a thermaltake smart 700W psu to power the gpu and I plan on using the stock psu to power everything else since the connectors are old and don’t match the ones from the thermaltake. I currently have the power pins shorted using some spare wire I had. They are shorted so that the psu thinks it’s plugged into the motherboard and supplies power to the gpu. Is there anything else I should do before powering the system on?

gritty rock Jun 15, 2025, 6:21 AM

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I got the pc turned on but the graphics card isn’t being recognized

modern terrace Jun 15, 2025, 7:03 AM

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gritty rock I got the pc turned on but the graphics card isn’t being recognized

you plugged the HDMI/DP to the GPU right?

gritty rock Jun 15, 2025, 7:04 AM

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modern terrace you plugged the HDMI/DP to the GPU right?

Yes, but there’s no output

modern terrace Jun 15, 2025, 7:04 AM

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i just realized you want to use 2 psus

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that requires an amount of jankness i never did

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sorry cant help

gritty rock Jun 15, 2025, 7:05 AM

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Darn

barren heath Jun 15, 2025, 7:45 AM

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gritty rock I’m trying to install gtg 1660 super in an hp prodesk 600 g1 sff and I’m having...

O DEAR LORD, bomb bomb and im not talking about this setup even tho its horrible

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the smart rgb IS A KNOWN BOMB

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oof its just the smart

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well that one too is a BIG bomb too

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also you need a cooler

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also mixing 2 PSUs is VERY bad especially when one is 12VO

tidal dew Jun 15, 2025, 7:47 AM

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Do alert your nearest firefighter department

gritty rock Jun 15, 2025, 7:49 AM

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Ok but why isn’t my gpu being seen by my motherboard

barren heath Jun 15, 2025, 7:50 AM

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omfg you are not even shorting the right pins

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also the cpu needs to be cooled

gritty rock Jun 15, 2025, 7:50 AM

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Dw, it’s cooled now

barren heath Jun 15, 2025, 7:51 AM

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its not

gritty rock Jun 15, 2025, 7:51 AM

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barren heath omfg you are not even shorting the right pins

Any of those 2 black ones will work right?

barren heath Jun 15, 2025, 7:51 AM

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huh maybe but i did the one to the right as i got a jump starter like a actual one where you do not need to guess and that is where it is on it

oblique swift Jun 15, 2025, 8:00 AM

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Tbfh using a 700w psu just to power a 120w PSU is a problem in itself

gritty rock Jun 15, 2025, 8:01 AM

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oblique swift Tbfh using a 700w psu just to power a 120w PSU is a problem in itself

It was gonna be for the motherboard too but the pins didn’t match

oblique swift Jun 15, 2025, 8:02 AM

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I don’t know electrics and PSUs, although wouldn’t it simply be easier to find out what powers the pins on your old ass system and swap the connectors?

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Or if you want to be just as janky use a molex to PCIe cable with existing PSU?

barren heath Jun 15, 2025, 8:07 AM

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oblique swift Tbfh using a 700w psu just to power a 120w PSU is a problem in itself

its not a 700w psu

barren heath Jun 15, 2025, 8:07 AM

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gritty rock It was gonna be for the motherboard too but the pins didn’t match

did you really expect a 12VO motherboard to work with a not that

barren heath Jun 15, 2025, 8:07 AM

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oblique swift Or if you want to be just as janky use a molex to PCIe cable with existing PSU?

not good enough

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and i do know electrics and a bit about PSUs

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first of all everything should have grounding

gritty rock Jun 15, 2025, 8:08 AM

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barren heath its not a 700w psu

It is

barren heath Jun 15, 2025, 8:08 AM

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its not

gritty rock Jun 15, 2025, 8:08 AM

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The other one is the stock

barren heath Jun 15, 2025, 8:09 AM

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the motherboard NEEDS to be in the case anyways

gritty rock Jun 15, 2025, 8:09 AM

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Hold on

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Which psu are you talking about?

barren heath Jun 15, 2025, 8:09 AM

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the bomb 700

gritty rock Jun 15, 2025, 8:10 AM

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Yeah

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I got that one today. The box said 700W

barren heath Jun 15, 2025, 8:10 AM

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gritty rock I got that one today. The box said 700W

its not 700w

barren heath Jun 15, 2025, 8:10 AM

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gritty rock I got that one today. The box said 700W

also pleas for the love of god return it

barren heath Jun 15, 2025, 8:11 AM

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barren heath its not 700w

at a minimum its a 650w

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but i would not do over 5w with it

gritty rock Jun 15, 2025, 8:11 AM

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Why?

oblique swift Jun 15, 2025, 8:12 AM

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barren heath not good enough

132w + 75w motherboard power is fine for a 120w gpu

barren heath Jun 15, 2025, 8:12 AM

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gritty rock Why?

ITS SHIT MATE

gritty rock Jun 15, 2025, 8:12 AM

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So?

barren heath Jun 15, 2025, 8:12 AM

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IT CAN BURN YOUR HOUSE DOWN

gritty rock Jun 15, 2025, 8:12 AM

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Will it explode?

barren heath Jun 15, 2025, 8:12 AM

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IT CAN YES

gritty rock Jun 15, 2025, 8:12 AM

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Show proof

oblique swift Jun 15, 2025, 8:13 AM

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Well.. you’re already creating a configuration that’s unsafe

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I don’t think you need any more evidence

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What even possessed you to try this on something so old before even opening up the tower and looking at the proprietary motherboard and PSU connections?

gritty rock Jun 15, 2025, 8:16 AM

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oblique swift What even possessed you to try this on something so old before even opening up t...

Uhh

barren heath Jun 15, 2025, 8:16 AM

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xd the smart 600w did not even manage to do LTT labs testing

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there are no good 80+ white power supplies i know of anyways

oblique swift Jun 15, 2025, 8:18 AM

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Like you had 2 options. Learn how to safely do connector swaps or contact hp or whoever and see if they can sell you a psu that would work

barren heath Jun 15, 2025, 8:18 AM

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they would not

oblique swift Jun 15, 2025, 8:18 AM

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Well 3 options. Don’t do it in the first place and get a new pc when you got more money

barren heath Jun 15, 2025, 8:18 AM

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also i think that is a 4th gen chip or something

oblique swift Jun 15, 2025, 8:18 AM

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Yeah it will be 4th gen

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The king of overclocking gen is that one

barren heath Jun 15, 2025, 8:19 AM

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put the shit back into the case, then sell that pc then buy some used ultra cheap am4 thing

gritty rock Jun 15, 2025, 8:19 AM

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I think the only stock parts are the motherboard and psu

barren heath Jun 15, 2025, 8:19 AM

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cooler

oblique swift Jun 15, 2025, 8:19 AM

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That tiny cooler master cooler is so bad it had to come with the PC

gritty rock Jun 15, 2025, 8:19 AM

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Sure

barren heath Jun 15, 2025, 8:19 AM

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also again you cant use the pc

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the cooler needs something to screw into

oblique swift Jun 15, 2025, 8:20 AM

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My 4th gen cpu would burn my house down before and after the overclock. No idea how any ever ran tiny coolers on them

gritty rock Jun 15, 2025, 8:20 AM

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Anyway I gotta sleep

oblique swift Jun 15, 2025, 8:21 AM

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Turn the pc off and take the plug out the wall first

gritty rock Jun 15, 2025, 8:27 AM

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I’m gonna cut the mounts off of the case and just screw the motherboard into those like nuts

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I plan on making a case out of some cardboard I have laying around, you have a list of parts I could use to make the pc itself better? Links would be super useful

barren heath Jun 15, 2025, 8:51 AM

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gritty rock I plan on making a case out of some cardboard I have laying around, you have a l...

used am4 pc

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DO NOT build out from some proprietary shit box

oblique swift Jun 15, 2025, 9:26 AM

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I don’t often say this. I like DIY, creativity all that jazz. However you sir… should not do this. When you say “screw the motherboard into those nuts” which I hope you are referring to the standoff screws.. it shows the knowledge you have is not yet good enough to achieve what you want. More so, you’re probably going to kill the board or some other component and take more of your own time and expense in the process. Research it first, heavily, before you do for a first time

gritty rock Jun 15, 2025, 10:04 PM

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It works

oblique swift Jun 15, 2025, 10:46 PM

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