Question PC doesn't turn on after GPU upgrade

[mag339]

First, let me list all of my components:

CPU: Ryzen 5 3600
Motherboard: Gigabyte B350M Gaming 3 (F51 latest firmware)
2x Corsair Vengeance 8GB 2400 Mhz DDR4 RAM
PSU: Cooler Master Masterwatt 650 80+ Bronze Semi-Modular
Case: Aerocool Aero 500
1x M.2 SSD, 2x 2.5" SSD, 1x 3,5" HDD.

My old GPU: Asus Expedition GTX 1050TI
My new GPU: PNY GeForce RTX 4070 XLR8 Gaming Verto Epic-x

So, i removed my old GPU and put in the new one. My old 1050TI didn't need any power cables to work so i had to get 8x pin PCI-E power cable. My PSU is semi-modular and i've lost the pci-e cables so i bought replacement ones for an NZXT PSU (you should note that, i've did my research before buying and made some measurements with multimeter but still i'm not sure if this causes the problem).

I put the GPU in and plugged the power cables. I plugged the AC power cable and turned the PSU switch on. When i press the power key, nothing. Not even triggering. But if keep the GPU on the PCI-E slot and remove the GPU power cables, it turns on, GPU lights on but no display. Works pefectly fine with the old GPU back on. Now i'm planning to return the GPU but i'm still wondering if i did something wrong. Was it me or was it a faulty GPU. Can you give me and advice? My plans for new year's eve ruined 🙁

 

[punkncat]

Are you 110% positive the cables you purchased for use on your Masterwatt from NZXT are the same? Was there a recommend from Cooler Master to do so?

Generally speaking that is not going to work and can cause damage which it seems you have been lucky enough to avoid so far. Contact Cooler Master and get the proper cabling and try again. Let us know how that goes.

 

[kira-faye]

Why would you ever buy cables for a different PSU? There's been an influx of bizarre threads lately, maybe because of the holidays.

 

[punkncat]

Of note, Nvidia recommends a 750W PSU for that card. Rather than purchasing the proper cables it is probably a better option to upgrade to a more powerful unit.

 

[mag339]

Are you 110% positive the cables you purchased for use on your Masterwatt from NZXT are the same? Was there a recommend from Cooler Master to do so?

Generally speaking that is not going to work and can cause damage which it seems you have been lucky enough to avoid so far. Contact Cooler Master and get the proper cabling and try again. Let us know how that goes.

Well, turns out i made a mistake by buying NZXT cables. I was thinking very straight forward, i thought i needed PCI-E male to male cable. But here's the situation:

This is the Coolermaster Masterwatt 650's PSU side pin out (yellows are 12v and blacks are ground):

And this is a normal GPU side PCI-E power socket pin out:

What Coolermaster does with their pci-e power cable is reverse the cables to the GPU end power socket from the PSU end. But when i examine the NZXT cables i realized when a cable comes from PSU end, let's say it's bottom right pin, it goes to bottom right pin on the GPU end. That explains why my GPU didn't work with that cable. That's totally my mistake.I should have known better.

Now there is a bigger question, did i damage the GPU by connecting it with this cable? There must be some sort of protecction system in the PSU because it didn't even trigger the computer when i was using this cable. I really hope that my new GPU is okay. But i won't be able to find out until the right cables arrive. Still, thank you for informing me about the situation.

Why would you ever buy cables for a different PSU? There's been an influx of bizarre threads lately, maybe because of the holidays.

Like i explained above, i was thinking very straight forward and i was terribly wrong. Of course, an original Coolermaster power cable would be my firs choice but i was trying to get it work before the holiday. So i didn't want to wait for shipping and looked for the ones selled in my local area. This NZXT cable was my only choice. Now i wish i was patient.

Of note, Nvidia recommends a 750W PSU for that card. Rather than purchasing the proper cables it is probably a better option to upgrade to a more powerful unit.

This is from the webpage of my GPU. I trusted this:

 

[kira-faye]

If you've feeling brave you can probably re-pin the cable you bought, but I wouldn't recommend it.

 

[ohio_buckeye]

Before spending for adapter cables you might consider a better psu and hope and pray you didn’t damage the gpu.

 

[DSzymborski]

You might've done serious damage. You'll only know for certain with a proper PSU with its proper cables. Unfortunately, there have been some missteps here. Even if it were the correct cable, I'm not sure why one would pay to get a cable for a PSU that's not particularly good quality in the first place to run an RTX 4070.

 

[steveb1976]

i would suggest 3 options

1)ask a friend/family if they have a spare psu you could borrow to test the card on your computer (and hope nothing is damaged (other pc parts)

2) ask friend/ family to stick your card in their cpmputer and test it(if they have pci-e cables on there psu).

3) look on facebook market place and hope someone is selling a cheap psu locally that you can pick up. .

or if you live near a computer store and its open today.. rush there and get a psu (still on christmas sale) or wait until tuesday when "most places has "january sales" (uk).

i hope all goes well...

 

[ohio_buckeye]

Don’t get a psu used from anywhere. You don’t know how it was used and under what conditions. Better off to go to a store if possible and pick up a high quality unit.

After all we are talking about a close to 600 dollar card. Even if the card is damaged you want to be sure that you have clean power for whatever card you get.

 

[mag339]

If you've feeling brave you can probably re-pin the cable you bought, but I wouldn't recommend it.

I don't have the proper tools to do it so i didn't want to mess the good cables up. The person who selled me these NZXT cables didn't want to buy them back so i'm selling them.

Before spending for adapter cables you might consider a better psu and hope and pray you didn’t damage the gpu.

Is my PSU really that bad? A lot of people on the internet say that "a good 650w psu" should be OK. Does it worth to invest in a better PSU? Or if i need a new PSU for sure, how soon it should be? I mean i just bought a new GPU it's gonna be a while until i will be able to buy a new part. Also it's a great pleasure to inform you that GPU is still working. Had the chance to test it on another case.

You might've done serious damage. You'll only know for certain with a proper PSU with its proper cables. Unfortunately, there have been some missteps here. Even if it were the correct cable, I'm not sure why one would pay to get a cable for a PSU that's not particularly good quality in the first place to run an RTX 4070.

Is my PSU really that bad? A lot of people on the internet say that "a good 650w psu" should be OK. Does it worth to invest in a better PSU? Or if i need a new PSU for sure, how soon it should be? I mean i just bought a new GPU it's gonna be a while until i will be able to buy a new part. Also the original cables are on their way. My family found them in my old room and they are shipping it from my hometown.

i would suggest 3 options

1)ask a friend/family if they have a spare psu you could borrow to test the card on your computer (and hope nothing is damaged (other pc parts)

2) ask friend/ family to stick your card in their cpmputer and test it(if they have pci-e cables on there psu).

3) look on facebook market place and hope someone is selling a cheap psu locally that you can pick up. .

or if you live near a computer store and its open today.. rush there and get a psu (still on christmas sale) or wait until tuesday when "most places has "january sales" (uk).

i hope all goes well...

I followed your suggestions and i had the chance to test my GPU on another case. It still works thankfully. Thank you for your suggestions and your best wishes. I hope 2024 goes well for you.

Don’t get a psu used from anywhere. You don’t know how it was used and under what conditions. Better off to go to a store if possible and pick up a high quality unit.

After all we are talking about a close to 600 dollar card. Even if the card is damaged you want to be sure that you have clean power for whatever card you get.

Do you think Coolermaster MasterWatt 650 is enough for the jub? Or is it worth investing in a new PSU? Can it handle the job for1-2 months until i get a new PSU? I'm thinking 750w with 80+ Gold at least, but it's gonna take some time for me.

 

[DSzymborski]

The PSU is mediocre quality and inappropriate for an expensive GPU. And you don't even have the right cables for it.

You could find out more information by testing the 1050 Ti, but it would still require you to have a proper cable with the old PSU, which isn't worth buying. And the 4070 may very well be busted now (and it's not a warranty issue). But we don't know more about what's going on until things can be tested.

 

[mag339]

Original cables have arrived and GPU is working just fine. Thanks to everyone.

 

[ohio_buckeye]

Sounds like you dodged a bullet but you should still consider upgrading the psu.

 

[DSzymborski]

Original cables have arrived and GPU is working just fine. Thanks to everyone.

I think you were better without, because now you're *using* the PSU.