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PSU enough to handle my rig for a while?

post #1 of 12
Thread Starter 
Is my current Corsair HX850 enough to handle:

Intel i5 2500k @4.5
ASUS P8P67 PRO
G.Skill Ripjaw 4GB DDR3 1600mhz
Sapphire 5870 Crossfire
2 x OCZ Vertex2E SSD RAID0 + WDC640 Black x2
6 fans + 2 x NZXT sleeved LED 100cm kits

I was thinking about selling my non-reference Vapor-X (I have 1 reference and 1 non-ref) and picking up another reference 5870 but will the PSU handle it all even if I overclock the GPU's?
post #2 of 12
850W should be ok but as you reach the PSU's rated wattage its efficiency goes down. Check some PSU calculators for a good estimate for your parts.
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post #3 of 12
Quote:
Originally Posted by djk11 View Post
850W should be ok but as you reach the PSU's rated wattage its efficiency goes down. Check some PSU calculators for a good estimate for your parts.
A calculator will not give him a good estimate. More like an unnecessarily bloated one.

Yes, an HX850 is way more than enough for that computer. It'd run fine on a good 450-500W unit really. And if/when you add a 2nd 5870, you'll still have lots of room.
post #4 of 12
HX850 is more than plenty. That thing can run two 6870s
    
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post #5 of 12
Quote:
Originally Posted by tryagainplss View Post
HX850 is more than plenty. That thing can run two 6870s
You mean two 6970s and a PhysX card.
post #6 of 12
Thread Starter 
Quote:
Originally Posted by Shub View Post
A calculator will not give him a good estimate. More like an unnecessarily bloated one.

Yes, an HX850 is way more than enough for that computer. It'd run fine on a good 450-500W unit really. And if/when you add a 2nd 5870, you'll still have lots of room.
I've already added the 2nd 5870 but one is a reference and one is non-reference. I meant I was going to swap the non-ref for a ref so I could get a better OC out of both of them

Thanks for the answers guys, just wanted to be sure it was enough
post #7 of 12
Will do it fine.
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post #8 of 12
Quote:
Originally Posted by djk11 View Post
850W should be ok but as you reach the PSU's rated wattage its efficiency goes down. Check some PSU calculators for a good estimate for your parts.
Not necessarily. If the psu has a bronze, silver or gold rating, they'll be rated to carry their advertised load to 100% at the advertised efficiency

i.e. if the psu is a 750w bronze (certified) rated psu, it's supposed to be rated for 750w at 100% with the bronze rating of 82% efficiency. I guess you're at the mercy of the manufacturer as to whether the rating is true but they usually are correct when they claim "certified". The ratings are measured at the 20% 50% and 100% load level
Edited by hollywood406 - 2/3/11 at 10:14am
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post #9 of 12
Quote:
Originally Posted by hollywood406 View Post
Not necessarily. If the psu has a bronze, silver or gold rating, they'll be rated to carry their advertised load to 100% at the advertised efficiency

i.e. if the psu is a 750w bronze (certified) rated psu, it's supposed to be rated for 750w at 100% with the bronze rating of 82% efficency. I guess you're at the mercy of the manufacturer as to whether the rating is true but they usually are correct of they claim "certified" The ratings are measured at the 20% 50% and 100% load level
Yes, but they are tested @23c which is unrealistic

Some psus can handle 100% load @23c but fail or lose efficiency when the temperature rises to 'real world levels'
Edited by Kasp1js - 2/3/11 at 7:39am
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post #10 of 12
Quote:
Originally Posted by Kasp1js View Post
Yes, but they are tested @23c which is unrealistic

Some psus can handle 100% load @23c but fail or lose efficiency when the temperature rises to 'real world levels'
Interesting. I've read multiple reviews from the jonnyguru.com website, specifically the high efficiency psu's. If you're not aware, as one of his tests, he installs them in what he calls his "Hot Box" a special case that is modded to make it hotter inside to see if the psu continues to function and maintain it's regulation and efficiency as well as the cold testing (room temperature).

In all the models that I read, in research for a new 80+ Gold rated psu for my HTPC, none of them budged from their specs at room temperature. Maybe that's a testament to the quality of Seasonic and Corsair supplies (as well as others) but I haven't read where one failed if it managed the cold test OK, and that includes the 80+ bronze psu's too.

I suppose it's possible to lose efficiency at higher loads but realistically, how many OCN'ers actually run their psu at it's rated load? I think most of us run psu's that are overkill and err on the side of caution when choosing, for future upgrades. Says the guy that runs a 1200w supply for a realistic 320w load on his overclocked i7 and SLI of GTX480's
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