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What size PSU

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  • Power Supplies
  • Components
Last response: in Components
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January 23, 2012 2:54:54 AM

Hey guys. Getting very close to having enough money to pull the trigger a new build, but I am not sure which size PSU I need. I've got a couple of options as to what my build will look like. As it stands now, it is:

Option 1
Case: Corsair Carbide 400R
Motherboard: ASRock Z68 Extreme 7 Gen3
CPU: Core i5 2500k
GPU: HD7970 reference
HDD (OS): OCZ Agility 3 60GB
HDD (Storage): Seagate Barracuda 1TB
CPU Cooler: Noctua NH-D14
RAM: Corsair Vengeance low profile 16GB (4x4GB)
DVD: LG LG GH24NS70
Monitor: Asus VE247H 23.6in Widescreen
OS: Windows 7 Professional 64 Bit
Mouse: Logitech G400
Keyboard: Enermax Aurora Lite

What size PSU will I need for the above system?
What would I need if I added say, a second 7970, another hard drive and second monitor?


Option 2:
My second question goes as follows. I will have pretty much the same system except:
CPU: Core i5 3570k/Core i7 3770k when IB arrives.
GPU: Kepler's equivalent of the GTX580 (GTX 680? 690?)


What size PSU will I need here? It's obviously a bit of a guess, but the Tom's forumites have been around the block a few times so....
What would I need if I added say, a second GTX <insert number here>, another hard drive and a second monitor?


General details:
I'm quite happy to spend on a PSU. I don't want to be short of power, but I don't want the PSU barely getting out of first gear. The system will be used for both video editing (hence the RAM) and gaming. I will also look to do some overclocking. For example, I wouldn't mind getting the 2500k to the 4-4.2ghz mark.


Thanks heaps guys.

More about : size psu

a c 111 ) Power supply
January 23, 2012 2:57:14 AM

Corsair tx850w
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a b ) Power supply
January 23, 2012 5:40:38 AM

Hi :) 

You said "What would I need if I added say, a second 7970, another hard drive and second monitor? "

Answer...1000w PSU and a HUGE amount of money.... :) 

All the best Brett :) 
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a b ) Power supply
January 23, 2012 6:32:18 AM

its not always the size of the psu that matters.
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January 23, 2012 6:48:34 AM

Brett928S2 said:
Hi :) 

You said "What would I need if I added say, a second 7970, another hard drive and second monitor? "

Answer...1000w PSU and a HUGE amount of money.... :) 

All the best Brett :) 

:D 

I've been waiting for years to buy a new computer. I'm okay with splurging a little. I'm going from a AMD Turion dual core @ 2.2ghz with 3gb of RAM and a Radeon 4650...
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a b ) Power supply
January 23, 2012 9:12:49 AM

1000w is going to be enough for almost if every dual card build upto and including GTX 580 while also leaving headroom for over-clocking ect ect.

However if your looking to do crossfire 7970's, as 'amuffin' said, 850w is going to be enough :) 
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