DO I really need 720Watt PSU on my PC, help needed

  erkmatrix 22:22 16 Sep 2007

Getting slightly concerned now about how much electricity my new PC is going to cost as only I ordered my new PC with a Atrix 720Watt Silent Dual Fan and also want to get a 110W Benq FP241W 24"

thats a massive 830w, woh my current machine has a 500w psu and a 50w monitor.

Do I really need 720W to power my spec PC

Gamers Intel Core 2 Duo 8800 (Intel Core 2 Duo E6850 3.0 GHz 4Mb Cache, 4Gb Corsair Memory DDR 800, 500GB SATA Hard Drive, , 8025-C43 Midi, Atrix 720Watt Silent Dual Fan , 768Mb Nvidia 8800GTX graphics card DX10, QC - Gigabyte N680iSLI-DQ6-1333fsb-DDR1066x4 SLI (Dual graphics), DVD+/- RW - 18X Samsung Lightscribe, Floppy Drive - SILVER, Integrated Sound Card, Intergrated Monitor Speakers, , Microsoft Windows XP Home Edition Inc SP2

I only sort of realized when I saw how much watts the monitor will be. Should I maybe consider an alternative psu and maybe monitor, one that does less.


  brundle 22:26 16 Sep 2007

It will only use as much as it needs.

  erkmatrix 22:39 16 Sep 2007

oh will it, thats OK then yeah I did a calculation using this click here
and found it came to around 350w, so that is about all it will use.

I did read somewhere that google is trying to get psu makers to not make psu to consume so much electricity as computers don't really need half of what they use.
Can't find the article now

  woodchip 22:48 16 Sep 2007

You are going way over the top about your concerns, When you talk of the watts you are not talking 240 volts at the same time. Volts are only low. The main user of you electric will be the Monitor, So when you are not using it for a while switch the monitor off. Do not use Screen savers, they was created for a by gone era Crt Monitors of old not the later type of Crt monitors and LCD monitors are more affected if the have still pictures that are mostly Black and white also adverts. Anything that makes light uses more electric, like a monitor

  project 90 22:51 16 Sep 2007

doesnt the 8800gtx require 500W psu for best performance?

  erkmatrix 22:56 16 Sep 2007

Just found it
click here

  erkmatrix 23:01 16 Sep 2007

Cheers woodchip, put my mind at rest, yeah I as you can guess know nothing about electricty and am always finding problems with things, force of habit.

So the monitor been a 24" and 110W one is going to use quite a lot, I have seen a LG L245WP 24 inch which it says only uses 80W so may opt for that one although the reviews aren't as good and lacks the image quality of the benq

  woodchip 23:05 16 Sep 2007

As above turn it of when you are not using it, you can leave the comp running, But I turn my Comp off at night and also if I leave it for some time

  martin wilson 23:05 16 Sep 2007

im confused doesnt the power consumption of the monitor refer to how much it uses from its own power supply ,i presume its either mains driven either direct or its own psu?
so it wont be taking power from the graphics card anyway

i use a 800 watt on my gts and 1000 watt on my gtx. you need 26 amps on the 12v rails for gts and 29 amps for gtx the 700 watt has a meter it never goes above 320 watt, the reason i use big psus is a 530 watt hiper had problems with a 8800 320mb gts and the large dual fan psu's dont seem to speed up too much nut get rid of loads of hot air so keep the system quiet. as has been said they will only draw what is needed.

  citadel 23:37 16 Sep 2007

I have not heard of atrix. Quality psu's have the 80% + logo, this means they are efficient and save on your electicity bill.

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