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Should I wait for PSU to die ?

post #1 of 6
Thread Starter 
At the moment I have LC8750 V2.2 Prophecy 750W(with OVP, OCP, OPP, UVP, SCP) and is about 2 and a half years old. I am about to buy new gpu and I wish to OC my cpu from 2,6 stock to 3,8-4ghz. Should I buy a new psu like ax850 to be save or should I run my system on this one ? Also what are the dangers of psu failing, does all my components get fried ?
    
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post #2 of 6
When the PSU dies it doesn't necessarily fry all your components but there is always a chance it'll fry something.

What GPU are you thinking of getting? If you're only getting 1 there's no point in an AX850, get something like the HX/TX 650 and save some money.
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by MMJA View Post
When the PSU dies it doesn't necessarily fry all your components but there is always a chance it'll fry something.

What GPU are you thinking of getting? If you're only getting 1 there's no point in an AX850, get something like the HX/TX 650 and save some money.
I'm getting single msi GTX 570 power edition but will most likely add another later
I'm just wondering should I change my psu just to be save or should I risk it on this old one
    
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post #4 of 6
Don't risk it, that's some pretty decent hardware you're planning and it would be a shame if it went because of your PSU. Your specs will be quite similar to mine, I did a little experiment awhile back working out power consumption of my rig, here are the results:

Stock:

Idle: 174W
CPU load: 258W
GPU load: 338W
CPU + GPU load: 424W

CPU OC:

Idle: 196W
CPU load: 309W
GPU load: 359W
CPU + GPU load: 480W

GPU OC:

Idle: 174W
CPU load: 259W
GPU load: 357W
CPU + GPU load: 447W

CPU + GPU OC

Idle: 198W
CPU load: 311W
GPU load: 378W
CPU + GPU load: 496W

CPU + SLI GPU OC

Idle: 215W
CPU load: 333W
GPU load: 592W
CPU + GPU load: 715W

Stock is stock frequency with all power saving features enabled (C1E, speedstep)
CPU OC is 3.6GHz @ 1.32500 vcore
GPU OC is 800/1600/1950 @ 1.025v
For Idle I let it sit on the desktop with no active windows for a minute and watched for the peak.
For CPU load I ran Prime95 small FFT for a minute or so and watched for the peak.
For GPU load I ran 3DMark11 GPU test 1 and watched for the peak.
For CPU + GPU load I ran both Prime95 and 3DMark 11 at the same time.

The PSU I'm using is the Enermax Revolution85+ 1050W which is rated 80+ Silver, I'm in New Zealand so AC input is 240VAC, which gives my power supply an efficiency of 85%-89%-85% at 20%-50%-100% load.
The figures in the results are the AC watts measured with a power meter, so actual system consumption is about 85-89% of that.

As you can see my setup with two GTX 570's OC and OC'd i7 920 just touched 715W AC (~622W DC) when under full load. So the Corsair AX750 will be plenty beefy enough for your requirements, you could probably even get away with a 650W since loading up the GPU + CPU fully is a pretty unrealistic scenario.

Hope this helps in your power supply purchase decision.
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CPUMotherboardGraphicsRAM
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Samsung 840 pro Seagate Barracuda XT Seagate Barracuda Green Samsung 840 pro 
Optical DriveCoolingOSMonitor
BenQ DVD writer ThermalRight Venomous X w/ 2x Gelid Wing 12 PL ... Windows 7 Ultimate x64 Samsung S27A950D 
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Corsair Vengeance K90 Enermax Revolution85+ 1050W ERV1050EWT-01 NZXT Switch 810 Corsair Vengeance M60 
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post #5 of 6
Thread Starter 
Thanks you, that really helped me
    
CPUMotherboardGraphicsRAM
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Corsair AX850 Full tower HAF-X CM Storm Inferno Razer Goliathus Speed Edition 
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CPUMotherboardGraphicsRAM
i7 920 @ 3.60ghz gigabyte ex58-ud4p msi gtx 580 lightning 12gb DDR3 kingstone 1600 
Hard DriveOptical DriveOSMonitor
1tb raid 0 (WD 512gb x2) + WD 640GB Super Write Master Windows 7 Professional 64-bit LG Flatron W2452TX 24' 
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Corsair AX850 Full tower HAF-X CM Storm Inferno Razer Goliathus Speed Edition 
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post #6 of 6
That LC Power is made by Huntkey and they mostly do overrated units. They may say 750W, but actually not deliver. So I'd be wary. But if it's powered your HD4870x2 and i7 fine, maybe it's one of those extremely rare Huntkey exceptions that actually do well.
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