What size PSU do I need?

[takeawaydave]

I was hoping to get some advice on a PSU to run a new machine I am building which comprises

2 x Xeon X5660
Supermicro X8DTL-6F
AMD FirePRO v4900
ASUS PCE-AC68
IBM M1015
OCZ Vertex 3 120GB
4 x SATA Drives

Whats the least I can get away with ?

 

[EquaLiZr]

I was just about to post the same thing so i'll semi-hijack this one

I7920 @ 3.8ghz
6gig ram
x58 mobo
7970 x2 (soon to be 2x 780ti)
6x 120mm fans
dvd burner
H60 water pump

 

[Deleted member 88227]

I was hoping to get some advice on a PSU to run a new machine I am building which comprises

2 x Xeon X5660
Supermicro X8DTL-6F
AMD FirePRO v4900
ASUS PCE-AC68
IBM M1015
OCZ Vertex 3 120GB
4 x SATA Drives

Whats the least I can get away with ?

Well I can't find any good benchmarks for Xeon X5660's, so I don't know what kind of power usage they take. What I did do was look at users in the DC sub forum who run SR-2 systems with that processor or the one below it. I seen one run a 1250W PSU, but he also powered two 400 series GPUs in SLI. They are power hungry, while another used a single 850W with a very low end GPU. With that being said, I think you'll be fine with an 850W PSU since the FirePRO v4900 isn't all that high end. Though if you want to be a little safer then go with a 900 - 950W PSU.