Help choose psu for gaming pc

[pleeman]

this is my build currently,

Intel Core i5 2500K 3.3Ghz Cache 6MB [Box] Socket LGA 1155 - Unlocked

ASRock Z68 EXTREME3 GEN3 Lucid Virtu supported (LGA1155, Intel Z68. USB3, SATA3)

WDC 1TB SATA3 64MB - Caviar Black - WD1002FAEX (ill get samsung spinpoint F3 if its available in my country but i doubt it)

G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBXL

MSI GTX 570 Fermi Rwin Frozr III/OC

AZZA Toledo 301 (CSAZ-301) Black Computer Case

LG 22\" E2241T LED

Lite On DVD RW 24X SATA [OEM]

Thermaltake Frio


i have trouble choosing the proper PSU, how much watts would i need? these are what I am currently thinking..

FSP Group AURUM GOLD 700W (AU-700) ATX12V/EPS 12V SLI Certified CrossFire ready 80PLUS GOLD Certified Compatible with Core i7 Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817104099

or

SeaSonic X Series X650 Gold ((SS-650KM Active PFC F3)) 650W ATX12V V2.3/EPS 12V V2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151088

or

High Current Pro HCP-750 750W TX12V v2.3 / EPS12V v2.92 SLI Certified CrossFire Certified 80 PLUS GOLD Certified Modular Active PFC Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371052

i will get the model based on the power i need.. thanks..

 

[Rizlla]

Are you considering SLi? If you are I would suggest at least a 850W PSU to be safe. I am not familiar with the FSP Group AURUM GOLD brand. I prefer to buy a PSU from Antec, Seasonic or Corsair. They are definite good brands.

I would say go for the ACP 750W, but if you would consider SLi go fro 850W.

 

[davcon]

A 600W unit is the minimum requirement .
All 3 of the units are good.
Personally i wouldn't go out of my way or spend extra money cuz it's an 80+ Gold unit.
But that's your perogative.

 

[beenthere]

If you want to objectively, accurately and scientifically determine what PSU power is required for your Vid card and PC in both watts and 12v rail amps., the forum Utility link below will show you how easy it is to calculate this information and objectively determine which PSUs are quality built, reliable PSUs that can meet your needs. Be advised that the available 12v rail amps. is just as important as the total PSU wattage. You need both to be correct.

http://www.tomshardware.com/forum/314712-28-please-read-determine-power-required

 

[pleeman]

then lets say a gpu needs 240 watts which is 20 amps.. does that mean the PSU needs to provide the output of +12V@20A at least?

the FSP aurum gives 4 x +12V@16A whereas antec gives +12V@40A.. can i say that fsp aurum gives total of +12V@64A?? and i am not quite clear on how the connection will work.. what do u guys think?

 

[Raiddinn]

From the way you have described it, it sounds like the 4x is number of that type of cable.

That is different than one cable that can push 64 amps down it. Different like black and white.

Look at how much power your video card uses and divide that by 20 and get one that says at least that number plus about 5 between the @ and the A.

Whatever you do, you probably don't want to pick a 16 A. The ANTEC 40 A is probably too much unless you want to SLI the top end cards as well.

 

[beenthere]

then lets say a gpu needs 240 watts which is 20 amps.. does that mean the PSU needs to provide the output of +12V@20A at least?

the FSP aurum gives 4 x +12V@16A whereas antec gives +12V@40A.. can i say that fsp aurum gives total of +12V@64A?? and i am not quite clear on how the connection will work.. what do u guys think?

Yes the PSU must have 20 amps. or more available on the 12v rail(s) JUST to power the Vid card if the Vid card requires 240W. That does not include the rest of the components in your PC that also use 12v power.

The FSP Aurum shows that is has (4) 12v rails that are rated at 18 amps. each. The details Tab on the Newegg website however does not show what the COMBINED output is from the 12v rails, which for some instances with high power demands may be important.

In your case you can use (2) of the 18 amp. rails to power your Vid card with power to spare and use the remaining (2) 12v rails to power anything else in your PC that requires 12v power.

 

[pleeman]

Yes the PSU must have 20 amps. or more available on the 12v rail(s) JUST to power the Vid card if the Vid card requires 240W. That does not include the rest of the components in your PC that also use 12v power.

The FSP Aurum shows that is has (4) 12v rails that are rated at 18 amps. each. The details Tab on the Newegg website however does not show what the COMBINED output is from the 12v rails, which for some instances with high power demands may be important.

In your case you can use (2) of the 18 amp. rails to power your Vid card with power to spare and use the remaining (2) 12v rails to power anything else in your PC that requires 12v power.

ah i see... this make sense now.. then basically both will do the job.. but from my point of view as a newbie the fsp does sound better with 4 output connector.. somehow its neater and more efficient..