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Did I make a mistake of buying a Corsair AX850 for my 3930K? - Page 2

post #11 of 18
Quote:
Originally Posted by Sprkd1 View Post

Thanks. If I use the AX850 which is 92% efficient (on 230V), 647.1 / .92 = 703.4 watts. Isn't this cutting it close for the AX850 or is a 83% continuous load on a power supply in the "safe region?"

If your psu is 92% efficient it can draw 923 watts from the wall and then it will output 850 watts into your PC.

Your psu is fine like everyone has said. There is no point to get a 1200 or 1500 watt psu and only use 700 watts......unless you like to waste money.

It does have a 7 year warranty, yes? Don't be worried about what percentage of max load your psu is running at. You won't be cutting it close unless you are trying to run tri-sli 580s on that....so in your case you have more than enough power.

I wish I knew the source that was getting everyone scared about their psu's and if they have enough power.
Edited by icehotshot - 12/23/11 at 2:37pm
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post #12 of 18
YOUR FINE DUDE even if you system does indeed draw 700watt it does not draw it while your idle or just surfing the web. it will probably draw that much watt if your Priming and running Gpu stress test at the same time
post #13 of 18
Quote:
Originally Posted by Sprkd1 View Post

Thanks. If I use the AX850 which is 92% efficient (on 230V), 647.1 / .92 = 703.4 watts. Isn't this cutting it close for the AX850 or is a 83% continuous load on a power supply in the "safe region?"

I'm not seeing why you're using the 647.1 watts in your math. The AX850 is rated at 850 watts right? You would take power rating and multiply it by the efficiency to find out what it will be able to deliver. So 850 * .92 = 782 watts. That is cutting it close for two 580's alone, not to mention a 3930k on top of it..
post #14 of 18
plus the AX series ussually can supply the rated watts just on the 12v rail. Real how many Amps the 12v rail on that PSU can provide, and multiply it by 12.

That graph is of a 3960X, but the CPus have the same TDP and power characteristics.

I made that graph, i have a power meter that can measure DC amps and watts, not the AC that is pulledfrom the wall, my meter measures the 12v input of the 8-pin connector(s). The CPU pulls power from the 12v exclusivly for the most part.
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post #15 of 18
Quote:
Originally Posted by Sprkd1 View Post

I never understood the "at the wall" statement for power supplies so I did some reading. I think I understand it now. smile.gif
The link states that the a 1200 watt power supply was used. Lets assume it is the AX1200 which is 90% efficient. So 719 watts * .9 = 647.1 watts. So that computer needs 647.1 watts at load?

Yes. that. 850W is plenty for your setup.
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post #16 of 18
Quote:
Originally Posted by computerparts View Post

I'm not seeing why you're using the 647.1 watts in your math. The AX850 is rated at 850 watts right? You would take power rating and multiply it by the efficiency to find out what it will be able to deliver. So 850 * .92 = 782 watts. That is cutting it close for two 580's alone, not to mention a 3930k on top of it..

This is FALSE......the power supply WILL DELIVER 850watts if your system needs it. Power from wall multiplied by the efficiency is the power draw of the system.

In any case this PSU is MORE than enough. Do not listen to people that have no clue what they are talking about.
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post #17 of 18
i THINK AX850 peaks at 1000 watts plus i bought one, don't give me a heart attack.
post #18 of 18
Quote:
Originally Posted by computerparts View Post

I'm not seeing why you're using the 647.1 watts in your math. The AX850 is rated at 850 watts right? You would take power rating and multiply it by the efficiency to find out what it will be able to deliver. So 850 * .92 = 782 watts. That is cutting it close for two 580's alone, not to mention a 3930k on top of it..

AX850 will provide 850W of DC power. Power at the wall is AC. The efficiency of a PSU is how well it converts electricity from AC to DC.
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