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Does PSU affect CPU overclockability?

post #1 of 15
Thread Starter 
I was just wondering if the PSU can affect overclocking. A specific example is the AX line of corsair PSU which are gold rated with >90% efficiency as opposed to 80plus certified TX units.

If the above proposed units will be affected in overclockability, what would you consider to be the best psu money can buy that ranges from 750w~ 1200w
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post #2 of 15
The PSU in your sig rig is more than enough power - biggest affecting factor would be your motherboard, memory, cpu, and cooler
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post #3 of 15
The only thing that can affect OCing that is related to a PSU is the voltage regulation and ripple. They can both cause instability while overclocking, but your PSU is good. Efficiency only reduces the amount of power pulled from the wall and the temperature of the PSU. The higher the efficiency, the cooler and less power pulled from the wall. I honestly dont think you need to replace your PSU because of its efficiency. You wont ever ever ever need a 1200 Watt PSU, or anything higher than 600 watts on your current setup.
    
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post #4 of 15
my silverstone never drops a beat. highlt recomend. but they aint cheap.
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post #5 of 15
Thread Starter 
Quote:
Originally Posted by appleg33k85;12273236 
The PSU in your sig rig is more than enough power - biggest affecting factor would be your motherboard, memory, cpu, and cooler
Quote:
Originally Posted by Sathirian;12273320 
The only thing that can affect OCing that is related to a PSU is the voltage regulation and ripple. They can both cause instability while overclocking, but your PSU is good. Efficiency only reduces the amount of power pulled from the wall and the temperature of the PSU. The higher the efficiency, the cooler and less power pulled from the wall. I honestly dont think you need to replace your PSU because of its efficiency. You wont ever ever ever need a 1200 Watt PSU, or anything higher than 600 watts on your current setup.

I have my D0 950 running at 4.3 HTTon at 1.392 on cpu-z and 1.4 core voltage from bios. But for some odd reason when i wanna jump from 4.3 to 4.4 it requires a crap load of core voltage and 4.5 is ridiculous, im talking it needs more than 1.55 juice. What might be the problem of this phenomenon? I realize that as you go up after a certain overclock the need for power exceeds exponentially but i just cant keep it stable until i turn httoff. at which the highest i have reached was 4.55ghz at 1.55vcore. Its really bothering me. Right now im just keeping it at 4.3 a moderate overclock which im not very ecstatic about considering my system is watercooled
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post #6 of 15
4.0-4.5 is around the point that voltage required increases exponentially for Nehalems. Just a fact. Using a top tier PSU (like SeaSonic X series) might reduce the voltage required by 0.01V maybe, but that's all.
post #7 of 15
Thread Starter 
Quote:
Originally Posted by nicko42004200;12273357 
my silverstone never drops a beat. highlt recomend. but they aint cheap.

I would pay maximum price for a solid powersupply. as long as i know that the PSU is not my bottleneck in overclocking i have one less thing to worry about. Second i have come to realize a solid cpu case and a solid kilowatt PSU goes a held of a long way and there is no need for upgrade which means i will save money on the long run. This said i dont mind spending money on these two components.
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ocz zx series 850w gold corsair 700D w/ window panel logitech g9x 
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My System
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CPUMotherboardGraphicsRAM
i5-3570k Asrock extreme4 Gen3 radeon 5870 corsair dominator gt 9-10-9-27 
Hard DriveOptical DriveOSMonitor
Raptor Raid 0 Sony Optiarc dvd and blu ray win 7 x64 Hanns G 28" 
PowerCaseMouse
ocz zx series 850w gold corsair 700D w/ window panel logitech g9x 
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post #8 of 15
Thread Starter 
I guess the biggest way to find out was to buy a gold certified psu that is top notched and see the comparison with my tx750w as far as overclocking is concerned. i cant lie about my hopes of it having a significant difference on the stability of my overclocking.
My System
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CPUMotherboardGraphicsRAM
i5-3570k Asrock extreme4 Gen3 radeon 5870 corsair dominator gt 9-10-9-27 
Hard DriveOptical DriveOSMonitor
Raptor Raid 0 Sony Optiarc dvd and blu ray win 7 x64 Hanns G 28" 
PowerCaseMouse
ocz zx series 850w gold corsair 700D w/ window panel logitech g9x 
  hide details  
Reply
My System
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CPUMotherboardGraphicsRAM
i5-3570k Asrock extreme4 Gen3 radeon 5870 corsair dominator gt 9-10-9-27 
Hard DriveOptical DriveOSMonitor
Raptor Raid 0 Sony Optiarc dvd and blu ray win 7 x64 Hanns G 28" 
PowerCaseMouse
ocz zx series 850w gold corsair 700D w/ window panel logitech g9x 
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post #9 of 15
An 850W power supply will run any dual GPU setup and most tri-GPU setups. 750W would run anything but overclocked SLI 480s. A 650W will run any reasonable dual-GPU gaming system. A 550W will run any single GPU gaming system (including an OC'd i7 and a GTX480/580) and many dual GPU setups. A quality 400-450W will run 99% of single GPU setups including your sig rig.
post #10 of 15
Quote:
Originally Posted by akajoshx1;12273514 
I guess the biggest way to find out was to buy a gold certified psu that is top notched and see the comparison with my tx750w as far as overclocking is concerned. i cant lie about my hopes of it having a significant difference on the stability of my overclocking.

"Gold" certification has little to do with a power supply's quality and suitability for overclocking. 80PLUS just certifies a power supply's efficiency, which was already explained earlier.

And there comes a point where even getting a higher quality power supply won't make a difference with overclocking because it's your motherboard or the CPU itself that is the bottleneck, not the PSU. The TX750 is below that point, but close to it.
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