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How much overhead should I plan for on a PSU?

sonicscreamer
Level 7
I've gone through several online PSU calculators and my total wattage comes to about 815W. I am debating whether I should go for a 860W PSU or a 1000W PSU.

I am hoping someone here can advise me on which one I should get? I understand that PSUs have different efficiency ratings under load but at the same time I don't want to get a bigger PSU for no apparent reason.

Any advice?
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8 REPLIES 8

kkn
Level 14
seasonic 1050W full modulare.

the more load you have on a PSU thats small, the quicker it will degrade.
the larger you have the more headroom and longer it will last.

ChiefZeke
Level 10
Get the 1000w
Lian-Li PC-A77F Full Tower case
PC Power & Cooling Turbo-Cool 1200 ATX12V & EPS12V PSU
ASUS Rampage IV Extreme LGA 2011 X79
Intel Core i7-3960X 3.31 LGA 2011 CPU
Intel RTS2011LC Liquid Cooling Solution
Kingston KHX24C11T3K4/32X (quad 32Gb memory kit) 2 each
ASUS Radeon HD7970 DirectCUII 3Gb GDDR5 PCIe 3.0 x16 Video Card (two in CrossfireX Mode)
Western Digital Cavier Black 2Tb SATA III 6.0GB/S
OCZ Technologies Vertex 4 SATAIII 6Gb/s 512Gb SSD

Chino
Level 15
sonicscreamer wrote:
I've gone through several online PSU calculators and my total wattage comes to about 815W. I am debating whether I should go for a 860W PSU or a 1000W PSU.

I am hoping someone here can advise me on which one I should get? I understand that PSUs have different efficiency ratings under load but at the same time I don't want to get a bigger PSU for no apparent reason.

Any advice?


List the complete system specifications with a much detail as possible.

Chino wrote:
List the complete system specifications with a much detail as possible.


http://rog.asus.com/forum/showthread.php?74333-Build-advice-please-RVE-Strix-SLI-Intel-750-PCIe-SSD

01_Wolverine
Level 12
I always add at least 200 watts as a rule of thumb, and round up to the next size

815+200=1015 then 1050 is the best one.Like kkn said 1050 Seasonic gold

sonicscreamer
Level 7
Great! thanks for the suggestions. Much appreciated.

sonicscreamer wrote:
Great! thanks for the suggestions. Much appreciated.


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