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Help buying a new PSU

Posted on 2013-12-03
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Last Modified: 2013-12-05
Hi All,


I recently bought this graphics card, which I think needs two 6 PIN PCI-e power connectors.

My current power supply has none, so needs replacing.

I have this case and CPU, whcih has a 150mm PSU limitation.

The current power supply powers four SATA hard drives and a four PIN is plugged into the mother board.

Can anyone help me pick out a new PSU from one of these sites?

amazon, scan, aria


many thanks
D
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Question by:detox1978
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16 Comments
 
LVL 35

Accepted Solution

by:
Dan Craciun earned 1600 total points
ID: 39692328
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LVL 2

Author Comment

by:detox1978
ID: 39692370
I know very little about power supplies and why they differ in price so much.

Are there any around to £30 - £50 mark?
0
 
LVL 35

Expert Comment

by:Dan Craciun
ID: 39692400
You should be fine with this: http://www.amazon.co.uk/Seasonic-M12II-520Semi-Module-ATX12V-Power-Supply/dp/B0038T0V8Q/ref=sr_1_10?s=computers&ie=UTF8&qid=1386077149&sr=1-10&keywords=Seasonic

Yes, there are much cheaper PSU's, but once you buy high-end components you need high quality PSU, or you risk crashes or abnormal behavior.

On your system, the processor is rated at 125W, video card at 225W, 4 drives are around 35W for a total of 385W, or 75% of the rated power for a 520W PSU.
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Author Comment

by:detox1978
ID: 39692887
Is this the same as the second one you posted?
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Expert Comment

by:Dan Craciun
ID: 39692913
Nope. The second one was a 620W PSU at £72, the third one is a 520W PSU, at  £55.
0
 
LVL 2

Author Comment

by:detox1978
ID: 39693839
Yeah the second one at 620W for £72 looks similar to this one for £55...
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Author Comment

by:detox1978
ID: 39694216
Ah, one is semi-moduler the other isnt.
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LVL 93

Assisted Solution

by:nobus
nobus earned 400 total points
ID: 39694844
calculate the power you need here : http://images10.newegg.com/BizIntell/tool/psucalc/index.html
and allow for a 50 W margin
0
 
LVL 35

Expert Comment

by:Dan Craciun
ID: 39694861
@nobus: don't you find Newegg's tool a little too overestimating?

Last year I tried their estimate on a gaming system I assembled for a friend.
The PSU calculator estimated a 720W need for the system, but on real-life usage (FPSs, mainly, some prime95 for a few hours, to test stability) the power sucked from the outlet never surpassed 520W. Don't remember the exact specs, but the PSU on the system was a Seasonic Bronze 850W.
0
 
LVL 2

Author Comment

by:detox1978
ID: 39694932
Thanks for the tips.  My setup seems to come in at 585 W.

I bought the non moduler PSU.
0
 
LVL 93

Expert Comment

by:nobus
ID: 39695142
Dan -  i always had the opposite -  it suggested a lower power wattage than i expected
you can compare it with this one - to be sure :
http://extreme.outervision.com/psucalculatorlite.jsp
0
 
LVL 35

Expert Comment

by:Dan Craciun
ID: 39695496
If I put the components correctly, the Outervision calculator has a recommended PSU Wattage of 469W, compared to 585W on Newegg.
This includes a 90% usage and 20% capacitor aging.
0
 
LVL 93

Expert Comment

by:nobus
ID: 39695688
interesting Dan; can you post what items you filled in; so i can check also?
if you're correct (and i assume so), newegg is trying to sell a bit too much
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LVL 35

Expert Comment

by:Dan Craciun
ID: 39695713
I probably forgot something the second time, but I'm in a hurry. Screenshot attached:
PSU on outervision
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LVL 35

Expert Comment

by:Dan Craciun
ID: 39697650
Yeah, on the first try I added a 120mm fan. Add it and you'll have 469W.

Not shown is the System load at 90% and capacitor aging at 20%.
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LVL 93

Expert Comment

by:nobus
ID: 39698320
yep i'll use this  outervicion one from ,ow
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