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Can't decide which PSU for new build

post #1 of 5
Thread Starter 
Hi guys,
I'm gonna be building a new system soon, nearly from the ground up (I'l be keeping the 1090T from the PC I use now). Now, I'm gonna be spending close on to £800 for my new parts which i'll list below but i'm a bit stuck as to which PSU to buy! I've found 1 I wouldn't mind but it does seem a bit pricey and to be honest i'm not sure if 750w will be enough or too much! I will be overclocking the system once I get round to it but will be aiming for around 4.0-4.2Ghz. The PSU I have in mind is an Enermax NAXN 750 80+ Bronze which is priced at £82 here - . I would prefer something a little cheaper though to offset the price a little and will only buy from Ebay as I've never had a problem with them apart from a couple of times and have been very pleased with the outcome of any problems that have risen.
The system I will be putting together will be consisting of -

Zalman Z11 PC case
Antex kuhler H20 620 water cooling
8-16Gb Corsair Vengeance 1600Mhz DDR3
2Tb Sata 6Gbps hard drive
Asus sabertooth AM3+ motherboard
7950HD graphics card
Also the 1090T and whichever PSU I finally decide on getting. I will also be adding a couple of cathcode lights and a few other extras that shouldn't affect power consumption much if atall!

I have done a bit of searching but I seem to be getting lost with all the PSU's that are around and I don't want to go so cheap that it may blow up on me considering that i'm spending out close to £800. I also want to leave enough room for overclocking purposes as I mentioned before and also wouldn't mind trying to keep it a modular supply althoughif the PSU is good enough for my purposes I wouldn't mind too much as the Z11 case will have cable routing available so space shouldn't be a problem.
Much thanks to all that reply.
P.S I'm from the U.K just incase anyone asks!
post #2 of 5
Hey I was just reading over the power usage reports for your components. your graphics card can use up to 300 watts by itself.
That is just about half your total. add another 95 for you cpu and a few other things. better yet here is a link for a psu caclulator should put you pretty close.

I got about 619 off your specs so 750 would be fine just dont plan on adding another graphics card or a higher end processor

http://extreme.outervision.com/psucalculatorlite.jsp
Stryker-PC
(17 items)
 
Homemade NAS
(13 items)
 
 
CPUMotherboardGraphicsRAM
amd apu a6-5400k msi onboard corsair 
Hard DriveHard DriveHard DriveHard Drive
western digital 2tb western digital 2tb hgst deskstar 3tb hgst deskstar 3tb 
Optical DriveOSMonitorPower
none nas4free hp logisys 480 
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Stryker-PC
(17 items)
 
Homemade NAS
(13 items)
 
 
CPUMotherboardGraphicsRAM
amd apu a6-5400k msi onboard corsair 
Hard DriveHard DriveHard DriveHard Drive
western digital 2tb western digital 2tb hgst deskstar 3tb hgst deskstar 3tb 
Optical DriveOSMonitorPower
none nas4free hp logisys 480 
Case
logisys 
  hide details  
Reply
post #3 of 5
Quote:
Originally Posted by Blade 117 View Post

Hey I was just reading over the power usage reports for your components. your graphics card can use up to 300 watts by itself.
That is just about half your total. add another 95 for you cpu and a few other things. better yet here is a link for a psu caclulator should put you pretty close.
I got about 619 off your specs so 750 would be fine just dont plan on adding another graphics card or a higher end processor
http://extreme.outervision.com/psucalculatorlite.jsp

Pretty sure that's for total system power consumption, not a single card. A 500-550 watt PSU would be perfectly fine for the specified build.
Edited by bR0ken_pr0Jector - 3/12/12 at 7:41pm
post #4 of 5
Thread Starter 
The HD7950 3Gb according to quite a few sites uses approx 330W MAX so I know that that's gonna be the main power hog of the system by miles! the 1090T is a 125W rated CPU not 95w and will use more once overclocked which is why i'm asking which would be the best PSU I should use considering that I want to spend max £80 on it! I wouldn't mind going for a 1000W PSU cos I do want to either upgrade or go crossfire at some point but that won't be for some time yet cos I think the system I'll be building in the end will be fine for any game etc that's thrown at it for a long time to come yet (I hope anyway lol!)
As I said, I want to keep modular if atall possible but I would like to try and get the best PSU in my price range as possible and from Ebay! I've already got a coolermaster 500w PSU with dual rails which have 20A on each rail but I feel that this will not be enough for the new build as it's already powering a 1090T & HD4890 1Gb with 2gb ram which is running along just nicely. I just want to try and get the best value for my money and if possible to try and future proof it too!
Thanks for your replies so far though, it's appreciated!
post #5 of 5
Quote:
Originally Posted by h4x0rm1k3 View Post

The HD7950 3Gb according to quite a few sites uses approx 330W MAX so I know that that's gonna be the main power hog of the system by miles! the 1090T is a 125W rated CPU not 95w and will use more once overclocked which is why i'm asking which would be the best PSU I should use considering that I want to spend max £80 on it! I wouldn't mind going for a 1000W PSU cos I do want to either upgrade or go crossfire at some point but that won't be for some time yet cos I think the system I'll be building in the end will be fine for any game etc that's thrown at it for a long time to come yet (I hope anyway lol!)
As I said, I want to keep modular if atall possible but I would like to try and get the best PSU in my price range as possible and from Ebay! I've already got a coolermaster 500w PSU with dual rails which have 20A on each rail but I feel that this will not be enough for the new build as it's already powering a 1090T & HD4890 1Gb with 2gb ram which is running along just nicely. I just want to try and get the best value for my money and if possible to try and future proof it too!
Thanks for your replies so far though, it's appreciated!

Again, that's for total system power consumption, not the card alone, here have some charts:

347
700

Look near the bottom of this one
700

Even the crossfire chart shows that a system with two 7950's can be ran quite comfortably on a 650 watt PSU under gaming conditions.
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