Psu Watts Needed To Power An Overclocked Cpu

[sacha35]

I have used the PSU calculator to work out some information on wattage used when overclcoking a CPU, I have taken my Opteron 165 at 1.8GHZ and this shows that it will use 263 Watts of power, I have then taken the FX60 running at 2.6GHZ and this uses 263 Watts of power, so both the same at standard clock speeds, but the FX is running at 800MHZ faster, I have then taken the wattage used when overclocking the Opteron 165 to 2.6GHZ keeping the same volts of 1.35 and the wattage jumps up to massive 361 Watts of power needed to run this chip at the same speed as the FX60.

Then I have taken a comparison of the FX60 and opteron both being overclocked to 3100 MHZ with the same amount of volts being 1.6 Volts, and the results of this is that the FX60 only needs 411 Watts of power to run this chip and the Opteron 165 needs a massive 609 Watts of power to run at the same speed.

This is quiet some difference of power needed to run both these chips at the same speed when you think they come from the same family, so I think it is worth thinking about this when buying a CPU and overclcoking as the power requirements just might not be up to what is needed like in my case I only have a 600 watt PSU so trying to just run the Opteron at 3.1GHz would be more than my PSU puts out that’s without the power the M/B, video cards, ram, drives and anything else required .

So having a powerful PSU is just as important as buying the best hardware.

 

[K404]

Your sums are off. Well..the PSU calculator sums are. Think about what you`re saying. NO CPU will pull 650W at any clock speed. The heat output would probably cook your dinner. from across the room. The stock power draw of the 165 will be...maybe 94W max?

And..for your last statement....

often the most overlooked component and we here can't drill that home enough 8)

 

[boardy]

rofl @ Kenny

 

[sacha35]

I take what you are saying but I am not to sure mate, i have done this test with outher AMD64 chips and FX chips and they seem to need about the same amount of watts, but when it comes to the X2 opterons they seem to need loads more Watts when overclcoking.

This i have confirmed as you know that my sata drives where crashing when trying to push my CPU, but since i have connected them upto anouther power supply there is know problem with them crashing anymore when overclcoking,

 

[K404]

Whats your PSU again? If its split 12V rail, the distribution might be not-ideal, but thats another story

 

[sacha35]

Yes its the Enermax EG701AX-VE (W) SFMA (600 WATT) with split rails, having a max current on these rails, [FONT=Verdana, Arial, Helvetica, sans-serif]+3.3V-34A, [FONT=Verdana, Arial, Helvetica, sans-serif]+5V-34A, [FONT=Verdana, Arial, Helvetica, sans-serif]+12V 1-18A, [FONT=Verdana, Arial, Helvetica, sans-serif]+12V 2-18A, [FONT=Verdana, Arial, Helvetica, sans-serif]-12V-2.5A, [FONT=Verdana, Arial, Helvetica, sans-serif]+5Vsb-2.5A, [FONT=Verdana, Arial, Helvetica, sans-serif]+3.3V & +5V-[FONT=Verdana, Arial, Helvetica, sans-serif]320W, [FONT=Verdana, Arial, Helvetica, sans-serif]Total Power-[FONT=Verdana, Arial, Helvetica, sans-serif]600W[/FONT]

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[maverik-sg1]

biad: Interesting biad:

 

[sacha35]

OK guys my mistake i have just received an Email from PSU calculator and it reads as follows,

I found a problem why you were getting so big numbers.

Opteron 165 and FX-60 are Dual Core processors which means it's a single

physical CPU that has 2 cores.

You have selected Dual Processor in System Type field which means 2

physical CPUs. You need to select a Single Processor for a System Type.

I have now done this calculation and have found though that both the FX 60 and opteron both need 153 Watts of power to run at stock speeds, but when an overclcok of 3100MHZ is used and an overvolt of 1.6v, then the Opteron needs 367 watts of power to run at these speeds and the fx60 just needs 227 Watts of power, so over double the amount of watts needed to power the Opteron 165 to the same speed of an FX running at the same speed.

So this clears that up so don't fret everyone my mistake