Is my 400w PSU enough for my RX 580?

[E-Bear]

Too much people suggest higher wattage but not enough look at amperage on rails. For exemple I have a 350 watts with higher amps on 12v than my Thermaltake 430w.

 

[Bill_Bright]

While that is not a top tier EVGA, I would not call it a "low quality" PSU.

 

[64K]

I wouldn't use a 6 pin to 8 pin adapter. iirc the 6 pin has 4 power wires and 2 grounds and the 8 pin has 4 power wires and 4 grounds so technically the 6 pin can deliver the power of a 8 pin and that's why the adapters exist but the 6 pin would be out of spec using it as an adapter for a 8 pin.

 

[xtreemchaos]

many moons ago I had one of those molex to 8pin on a r9 card think it was a msi 390X and the adapter melted and caught fire, the psu was old but 750watt , every thing still worked when i got another psu with the proper gpu power leads but it was enough to put me off using the adapters again.

 

[RealNeil]

I just bought an 2x molex to 8pin to use it with the 500w unit my teacher gave me (http://us.coolermaster.com/product/Detail/powersupply/legacy-psu/extreme-power-plus-500w.html)

I hope that it works out well for you.

 

[spectatorx]

many moons ago I had one of those molex to 8pin on a r9 card think it was a msi 390X and the adapter melted and caught fire, the psu was old but 750watt , every thing still worked when i got another psu with the proper gpu power leads but it was enough to put me off using the adapters again.

That's a horror story. I on the other hand have opposite experiences. Personally i was using such adapters with multiple cards (hd3850, hd6850, hd7790) on various quality of PSUs (nonames, ocz 80+ bronze), same goes for my friends and customers, nobody never had any issues with it, adapters were working fine.

 

[xtreemchaos]

I know people who has used them with no problems too but as the saying gos "once bitten twice shy" at my age the one thing ive learned is not to tempt fate because what could happen can happen bro. the thing was I didn't buy the adapter it was the one what come with the card in the box.

 

[SlayerJC]

I use the adapter on my r9 280x for years and never had a problem.

 

[bonehead123]

Go big or go home and play with yourself, while watching your 'puter go pooof & turn into a smoldering black pile of poo goo... hehehehe

But seriously, a 550-650w mid-teir model should give you plently of juice, and allow for some mild overclocking OR slight upgrades here & there (but not both together).... I'd recommend a Seasonic or similar unit...

 

[Ware]

Looks like two rails, 18 amps each.
I just hope your not putting everything on to one rail.
18amp x 12volt = 216 watt
I think a 580 goes like about 170-200ish watts?
Might be pushing your luck...

 

[dirtyferret]

Looks like two rails, 18 amps each.
I just hope your not putting everything on to one rail.
18amp x 12volt = 216 watt
I think a 580 goes like about 170-200ish watts?
Might be pushing your luck...

typically on these old ATX12V spec units the first rail (it's actually just a split of one rail) is for the CPU and the second handles everything else including the 6/8 pin pcie power connector to the video card.

 

[damric]

IF you stay within stock settings of the RX 580 and i7 it might work.

My RX 570 breaks my 550W Super Flower Golden Green if I push maximum overclocks on everything. My 650W LEADEXII has no problem though.

 

[elpapimejor]

I doubt I’ll overclock it since it was already used for mining

so I just switched the EVGA psu for the cooler master I got from my teacher and now the pc won’t start up.

I switched it back to the EVGA one and it wouldn’t turn on either.

Then I switched the EVGA one to the original dell one and it wouldn’t turn on either, but if I held the diagnostics button on the dell psu, the fans would start spinning but no signal.

now I’m scared that something just got shorted and fkd

 

[moproblems99]

now I’m scared that something just got shorted and fkd

Did the teacher like you?

On a serious note, without knowing if that PSU was any good, it is possible. However, you would likely smell that electronic ghost that was just given.

 

[elpapimejor]

We tested it before he gave it to me (multimeter, all outputs including molexes, cpu, and every single pin in the 20+4pin connector)

The prebuilt is an optiplex 990 and i've had similar problems before but was easily fixed with a memory reseat or just unplugging the 20+4pin connector, waiting 5 mins and plugging it back in

 

[thebluebumblebee]

That "500" watt CM PSU can only provide 360 watts of 12V, but on 2 18A rails. The EGVA that you have provides 360 watts on a single 12V rail. The EVGA is a better PSU. That CM unit is a design from the Pentium III days!

 

[Zach_01]

So, if I run the card on the 400w PSU for lets say about 3-6 months (While i get money for a new one) I should be okay

As other said, no one really knows what will happen. To give you a perspective, my system with a 580 when gaming was drawing 300~320Watt avg and had some peaks up to 350~360W. The gaming draw of my CPU is around 45-50W.
Typically RX580 draws 150~190W depending the game.

Your next new PSU should be at least a nice 550W.

 

[elpapimejor]

I guess the cm unit killed my pc? I already tried everything and all i get is a single flash of an orange light and then it powercycles

 

[INSTG8R]

I guess the cm unit killed my pc? I already tried everything and all i get is a single flash of an orange light and then it powercycles

So now you‘ve learned the lesson that a quality PSU is important.

 

[Deleted member 193706]

I guess the cm unit killed my pc? I already tried everything and all i get is a single flash of an orange light and then it powercycles

unplug everything (24pin ATX/ 4/8PIN CPU, front panel wiring, and reseat CU/RAM/GPU and try again, sometimes these things happen

 

[thebluebumblebee]

unplug everything (24pin ATX/ 4/8PIN CPU, front panel wiring, and reseat CU/RAM/GPU and try again, sometimes these things happen

I'd even pull the GPU, but there shouldn't be a reason to reseat the CPU.

 

[Ruru]

If it's a quality unit, then it's enough. I've ran R9 290 with 430W without problems.

Would absolutely undervolt it though.

 

[eidairaman1]

Pull everything out of case, inspect the back of board for damage, inspect cpu for damage, ram, gpu, atx connectors, put on non conductive table, elevate motherboard with non metallic/foil box. Clean all pcie and ram slots with a co2 duster or electronic grade contact cleaner, spray gently the lga socket or zif pga socket.

Hook up only motherboard with cpu, ram, gpu, keyboard, mouse, monitor and verify it reaches post screen, if it does then hook up the hdd/ssd, then other drives.

When hooking up components the psu must be switched off.

The SuperFlower Should be able to handle the GPU...

 

[elpapimejor]

Just finished doing what eidaraman just said but still, power light flashes and fans rotate for about a second or two and then it restarts/power cycles

 

[eidairaman1]

Your board is screwed. Even with the good EVGA?

Have you tried a old gpu?

What about a clear cmos?

Tried with 1 ram stick only?

Hook monitor straight to motherboard and do a clear cmos before booting