Possible PSU Overload?

[Sargent Mustard]

Hi guys. I just upgraded my rig with another 280x in the last few days.

Here are my complete specs:

CPU:Intel i5 2500k @ 3.3Ghz 

Cooling: CoolerMaster Hyper 212 EVO 

MB: MSI Z77A-G45 

GPU: Sapphire R9 280X TOXIC + Sapphire 280X Vapor-X OC 

RAM: 8Gb G.Skill Ripjaw @ 1600mhz

Storage 1: Samsung 840 120gb SSD 

Storage 2: Seagate Barracuda 2Tb HDD 

PSU: Corsair CX 750M  

Case: Corsair Carbide 400R.

 

Ran a couple of benchmarks in Heaven 4.0, everything seemed fine, scores of around 2200 at the Extreme preset. Temps were good, CPU at 50C and GPU1 at 75. Was playing around in Sleeping Dogs with all the settings cranked up to max. Then my PC suddenly shut off, like somebody had pulled the plug. It then booted up like normal. This is the second time this has happened although I suspect the first time was due to high CPU temps.

 

Because I have 2 high-consuming cards (not just any ol' 280X) , could it mean that my PSU can't handle them? 

[JeffreyEagan]

Maaaybe. It seems like an overload.

[dragoon20005]

750 watts should be enough for dual 280X

 

 

did you OC your GPUs?

[Sargent Mustard]

750 watts should be enough for dual 280X

 

 

did you OC your GPUs?

Nope. Toxic is OC'd out of the box @ 1150/6400, so is the Vapor-X @ 1070/6200

[Aniallation]

Ran a couple of benchmarks in Heaven 4.0, everything seemed fine, scores of around 2200 at the Extreme preset. Temps were good, CPU at 50C and GPU1 at 75. Was playing around in Sleeping Dogs with all the settings cranked up to max. Then my PC suddenly shut off, like somebody had pulled the plug. It then booted up like normal. This is the second time this has happened although I suspect the first time was due to high CPU temps.

 

Because I have 2 high-consuming cards (not just any ol' 280X) , could it mean that my PSU can't handle them? 

 

750 watts should be enough for dual 280X

 

Watts is not everything. It's 750, but it is a CX750. It is not recommended to use a CX PSU for two high-end GPUs.

 

 

Two 280X (7970) easily pull over 600W under load. I would not want to pull any more then 600W from a CX750.

[Juan Remes]

Yeah, sounds like an overload, i have the exact same PSU and can handle 2 R9 270X in crossfire pretty damn good, didnt know 2 280x would be this PSUs limit

 

But yeah that sounds like an overload, the same thing happened to me when i had a cheaper and less reliable PSU (and it was FREAKING hot at that point)

[Aniallation]

Yeah, sounds like an overload, i have the exact same PSU and can handle 2 R9 270X in crossfire pretty damn good, didnt know 2 280x would be this PSUs limit

270X (7870) Crossfire uses about 100W less under load then 280X (7970) Crossfire. At this high of load levels it can easily be the discerning factor for a CX750.

[Sargent Mustard]

Watts is not everything. It's 750, but it is a CX750. It is not recommended to use a CX PSU for two high-end GPUs.

 

 

Two 280X (7970) easily pull over 600W under load. I would not want to pull any more then 600W from a CX750.

 

 

Yeah, sounds like an overload, i have the exact same PSU and can handle 2 R9 270X in crossfire pretty damn good, didnt know 2 280x would be this PSUs limit

 

But yeah that sounds like an overload, the same thing happened to me when i had a cheaper and less reliable PSU (and it was FREAKING hot at that point)

 

 

You guys are legends. I thought I did the maths but turns out I just need to reach into my pocket a little deeper. I didn't realise the CX series was the budget series. 

Now that that's settled, any recommendations for a 800-850w PSU?

[Aniallation]

You guys are legends. I thought I did the maths but turns out I just need to reach into my pocket a little deeper. I didn't realise the CX series was the budget series. 

Now that that's settled, any recommendations for a 800-850w PSU?

Where are you located and what's your budget?

 

(inb4 evga g2)

[Sargent Mustard]

Where are you located and what's your budget?

 

(inb4 evga g2)

 

Aus. Budget is something within reason, not blowing AU$300+ on a AX860i

[Aniallation]

Aus. Budget is something within reason, not blowing AU$300+ on a AX860i

Cooler Master V-Series has really competitive pricing compared to other PSUs in Australia. I would definitely recommend the V750. Although it's still "750W", the Cooler Master V-Series are very high-quality units, and are happy to deliver their full rated output all day long.

 

https://au.pcpartpicker.com/part/cooler-master-power-supply-rs750amaag1s1

[Juan Remes]

You guys are legends. I thought I did the maths but turns out I just need to reach into my pocket a little deeper. I didn't realise the CX series was the budget series. 

Now that that's settled, any recommendations for a 800-850w PSU?

You are going to have a pretty 700-800 watts when under load, if i were you i would buy (or save up and then buy) a AX1200 or EVGA G2 1000/1300. Ill tell you why

 

of those 2 270x i was speaking about 1 is mine and the other one is from my girlfriend´s brother, i borrow him the card and tested it out (and DRAMATICALLY FAILED with the first PSU)  Months later i bought a new case (obsidian 450D) and realized my PSU cables were not long enough to get to the connectors so i bought a PSU too, but which one should i buy?  Well i read that as more headroom you have in your PSU for power consumption, you would be "future-proofing" your system a little more, checked out wattages and what not and decided to go with a CX750m for my SINGLE GPU system i DO NOT own that other card.

Best desition ive ever made because not only my PSU i always freshly cold even "under load" the wattage it draws off the wall is "super well balanced" my system maxes around 450-500 watts so the efficiency is UBER good.

 

i strongly recommend you to invest a little more and go for a bigger PSU, not because of the overkill or the "future-proof" but for the amazing efficiency your PSU will be giving and the longer life you will give to it by stressing it a little less.

 

Sorry for my (bad?) english, not a native speaker hehe,i hope my experience serves you at least a little.