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So, do I need 750 or do I need 850? - Page 2

post #11 of 19
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But he's not measuring the output usage but the socket on the wall. So, it should be higher than 22.
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post #12 of 19
Quote:
Originally Posted by fateswarm View Post

But he's not measuring the output usage but the socket on the wall. So, it should be higher than 22.

DC output (what the PSU is supplying to the components) is LOWER than the value shown at AC input.

Let's say it's 70% efficient. 23wAC will be 16.1wDC.
post #13 of 19
sory never mind
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post #14 of 19
My rig pulls 494w at the wall so a 750 is more than sufficient.
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post #15 of 19
Thread Starter 
Quote:
Originally Posted by qwan456 View Post

DC output (what the PSU is supplying to the components) is LOWER than the value shown at AC input.

Let's say it's 70% efficient. 23wAC will be 16.1wDC.
Exactly. He is reading from the wall and he claims it's only 22. That's hard to believe. If it's 22 there, then the whole desktop only does 12 or something. Please.

Unless I miss something and he's not reading from the wall and the PSU is massively inefficient.
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post #16 of 19
Quote:
Originally Posted by fateswarm View Post

Exactly. He is reading from the wall and he claims it's only 22. That's hard to believe. If it's 22 there, then the whole desktop only does 12 or something. Please.

Unless I miss something and he's not reading from the wall and the PSU is massively inefficient.

It really does use that little power and its not something most belive but it is true
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post #17 of 19
Quote:
Originally Posted by fateswarm View Post

Exactly. He is reading from the wall and he claims it's only 22. That's hard to believe. If it's 22 there, then the whole desktop only does 12 or something. Please.

Unless I miss something and he's not reading from the wall and the PSU is massively inefficient.

Claiming that he missing a zero, and that it should have been 220w is much harder to believe, unless the PSU is really <20% efficient as that load... That value he got isn't a sign that he misread it, as we too can see the value of the power meter as well as the entire setup. Basically, you are questioning accuracy of his meter.

It it isn't unreasonable for a system power draw to be around 12wDC, considering how this review shown a 2100T to draw <10wDC at idle (the regular 2100 will have a marginal difference in power draw at idle). http://www.xbitlabs.com/articles/cpu/display/core-i3-2100t_11.html
"The graphs below show the full power draw of the computer (without the monitor) measured after the power supply. It is the total of the power consumption of all the system components. The PSU's efficiency is not taken into account."

Since you are set on getting a 850w for two unknown big GPUs, enjoy your hardware.
Edited by qwan456 - 6/25/13 at 7:36am
post #18 of 19
Quote:
Originally Posted by fateswarm View Post

I suspect he missed a 0 on that video. Inefficient PSUs + idle desktop 22Watts? Laptops often need PSUs with higher output (not even input). It's probably 220 and he misread his meter.

My 39390K with two GTX 680, 1 HDD, 1 SSD, 4 DIMMS, and 7 120mm fans idles at 97 watts with power management enabled at Windows 8 desktop. That's at the wall.

I bet with a 3570/4670K, two DIMMS, 0 HDD, 2 fans, and a lower powered, single video card, 22 watts at idle might be "possible". 220 watts would be way too high.

Greg
post #19 of 19
850 watts is just a waste of money spend on quality not quantity

The Cooler Master V 700 watts would be almost perfect for your need its priced very fairly and it performs very well and its fully modular
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