PSU beefy enough?

[JohnSmith89]

Current build:
OCZ ModXStream Pro OCZ500MXSP 500W

ECS X58B-A2
i7 920 - TDP 130W
Powercolor HD4850 1GB - TDP 110W
G.Skill 3x2GB 10666 7-7-7-18 kit x 2
SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM 32MB Cache
Seagate Barracuda 7200.12 500GB 16MB Cache
Asus Xonar DX

I was considering adding another 4850 in crossfire in the near future. I only know the TDPs of the CPU and GPU, so adding 130 + 2x110 gives 350W. 385 with a 10% margin. How much do the other components contribute to the power draw? I know OCZ is a pretty well-known brand, but just how far should I trust the rating on the PSU? Is it worth buying another 4850 to put into CrossFire?

 

[Silvune]

Well I know that harddrives would use about 10W when under load. So at most it would 20W from the two harddrives, altho that is probably an overestimation.
Here's a review of that PSU: http://www.hardwaresecrets.com/article/798
For $10 more If I was you I would get this for a crossfiring system: http://www.newegg.com/Product/Product.aspx?Item=N82E16817341010 and review: http://www.hardwaresecrets.com/article/451

 

[grossemesser]

Well most likely it will not have enough power... maybe just a little increase like 650 or 700 Watt PSU would be better if you want to 'unleash the true power' lol. Does that 500Watt PSU that you are talking about has even enough 6-pin connectors??

 

[JohnSmith89]

Well most likely it will not have enough power... maybe just a little increase like 650 or 700 Watt PSU would be better if you want to 'unleash the true power' lol. Does that 500Watt PSU that you are talking about has even enough 6-pin connectors??

1 x Main connector (20+4Pin)
1 x 12V(P4)
1 x 12V(8Pin)
4 x Peripheral
6 x SATA
2 x Floppy
2 x PCI-E
Is my PCIe x1 sound card going to need a power connector?

 

[grossemesser]

nope, your sound card will not be needing one

 

[JohnSmith89]

So those connectors will be sufficient for my purposes? What sort of power consumption am I looking at with my current build without two 4850s?

 

[Silvune]

I would have thought around 250W under load.

 

[thuan]

The Xonar DX needs an external power connector, a floppy power connector that is.

 

[JohnSmith89]

Best answer selected by JohnSmith89.