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PSU decision, whats the best value?

post #1 of 11
Thread Starter 
Ok i'm getting close to the end of my computer build and I need to start saving money.

Basically my set up will be a single AMD Radeon 6950 (flashed to 6970), Gigabyte P67-A UD4 motherboard, i5 2500K core which will be getting overclocked, 8GB 1.5V RAM, a single HDD, single SSD and a CD Drive.

There will also be around 5 or 6 case fans plus a Corsair H70 cooler on core.

I had been looking at the XFX black edition 850W which is around £100, I'm just wondering if this is really needed or is this wattage over the top for this set up.

I'm unsure if I will eventually put in another GPU, if I do though it may be some years away so I may put in a different more powerful PSU at that stage.

Any suggestions?
Teh Powerhouse
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Teh Powerhouse
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post #2 of 11
go for the XFX pro series. this 650w cost me 70 quid and I am really please with it. its a seasonic inside it, the casing is really nice looking and the cables are ready sleaved. I wouldnt give it a miss

also. a 650w watt will be fine for your setup, Im going into crossfire with this one. plus the fact im working with a 135w CPU (OC)
Edited by JY - 3/22/11 at 1:37pm
:3
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:3
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2x 250GB HyperX Windows 7 SP1 x64 Benq G2420HD XFX 650W 
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lian li pc-q08b On-board 
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phenom II X4 955 C3 @ 4.2ghz 1.4v ASUS M4A79T Deluxe Radeon HD 5870 crossfire 940/1300 8GB corsair ddr3 1600mhz 7-8-7-20@1.75v 
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120GB Kingston HyperX SSD, 250gb HDD x3 +660Gb 5870 Accelero Xtreme Corsair H100  win 7 ultimate 64bit (stipped to bone) 
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post #3 of 11
650Watts should be fine for your setup with a calculated about 450W recommended.
post #4 of 11
Thread Starter 
Ah thank you, I was thinking that 850W seemed a bit over the top, it was the PSU recommended to me elsewhere on the web but I thought it seemed a little drastic. It seems to be a nice PSU looking at it on amazon, although weirdly the 750W version of this very PSU is a pound cheaper :S I think I will need to read into it more...
Teh Powerhouse
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Teh Powerhouse
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post #5 of 11
Quote:
Originally Posted by NitroNarcosis View Post
650Watts should be fine for your setup with a calculated about 450W recommended.
Agreed. 650W will be fine for your build. Refer to this: http://www.legitreviews.com/article/1488/18/

6970's (which may use more power than unlocked 6950's) don't even use 600W total power if you plan to Crossfire in the future. At the most you would maybe look at a 750 so you can add a couple extra components or beefier cards down the road, but 850 would probably be pretty overkill. Better too much than not enough though
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Uncle Blazer
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post #6 of 11
650w is plenty.
post #7 of 11
Thread Starter 
Ah ok so I should defiently stick to a lower 650W-750W depending on whatever is cheapest if it only needs 450W, thank you!
One small question, does the efficiency of the PSU change anything other than your electric bill? Can it effect say stability of your processor when overclocked and using more energy or something? Or if its over 80% eff does it not matter?
Teh Powerhouse
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1TB Samsung F3 Spinpoint LG CD/DVD 22x Windows 7 Home Premium 64bit Corsair TX850 
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CoolerMaster HAF X 
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Teh Powerhouse
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i5 2500K @ 4.0GHz GigaByte P67-A UD4-B3 MSI NVidia GTX 570 'Superclocked' 8GB Corsair Vengeance @ 1866MHz, 9:10:9:27 2T 
Hard DriveOptical DriveOSPower
1TB Samsung F3 Spinpoint LG CD/DVD 22x Windows 7 Home Premium 64bit Corsair TX850 
Case
CoolerMaster HAF X 
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post #8 of 11
A less efficient PSU will generate more heat and increase your power bill, but other than that, it has no effect on your computer.
post #9 of 11
Thread Starter 
Ah ok, well the number of 200mm fans in the case should keep it plenty cool, thats no worry then, thanks!
Teh Powerhouse
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i5 2500K @ 4.0GHz GigaByte P67-A UD4-B3 MSI NVidia GTX 570 'Superclocked' 8GB Corsair Vengeance @ 1866MHz, 9:10:9:27 2T 
Hard DriveOptical DriveOSPower
1TB Samsung F3 Spinpoint LG CD/DVD 22x Windows 7 Home Premium 64bit Corsair TX850 
Case
CoolerMaster HAF X 
  hide details  
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Teh Powerhouse
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CPUMotherboardGraphicsRAM
i5 2500K @ 4.0GHz GigaByte P67-A UD4-B3 MSI NVidia GTX 570 'Superclocked' 8GB Corsair Vengeance @ 1866MHz, 9:10:9:27 2T 
Hard DriveOptical DriveOSPower
1TB Samsung F3 Spinpoint LG CD/DVD 22x Windows 7 Home Premium 64bit Corsair TX850 
Case
CoolerMaster HAF X 
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post #10 of 11
850 is overkill! Go get something like a "kill-a-watt" at thinkgeek or your favorite retailer. My system doesn't use more than 215w on idle, and less than 750 watts benchmarking prime95 and furmark. I think you'll find you will be just fine with a 650 or so.

(not to mention a lot of the PSUs will go higher than they are rated!)
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Vertex 3 MaxIOPS Western Digital Caviar Black Lite-On DVD/CD R/W Corsair H100 
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Windows 7 Ultimate 64-bit HP ZR24w x3 Filco Majestouch 2 Tenkeyless (MX Red) Corsair AX850 
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CoolerMaster HAF-X Steelseries Sensei Razer Destructor Klipsch ProMedia 2.1 
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Astro A40 (wired) + Mixamp AP-15 x 6 
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AMD E-350 APU (Fusion) ASUS E35M1-I DELUXE Fusion APU G Skill Ripjaw 2x4gb 1066 c9 
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