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HX850W enough to handle 580 SLI 3GB Classified? - Page 3

post #21 of 40
Quote:
Originally Posted by Cryptedvick View Post
However, this was under extreme circumstances. If you're that kind of person that goes to these extremes, then yes, a 1000W PSU would suit you better, however, the OP is not even interested in overclocking these cards so it would be pointless to get a 1KW PSU because he would still have plenty of headroom even with both cards at full load.
This I do agree with.

The classifieds (On the EVGA forums) have maintained 1ghz 24/7 so, that's why I said, personally, I'd go for a higher roof but, like I said, I'm captain overkill.

You could do a reasonable overclock 24/7 and bench and not necessarily "roof it" on an 850...
post #22 of 40
In my opinion, it's kind of a waste to buy the Classified cards if they are going to stay stock. These cards were meant for overclocking to hell and back. Keeping them at stock is like buying a Ferrari to only drive local speed limits.

I think you'd be just as happy with a regular pair of reference GTX 580's 1.5GB or 3GB. Not only would you save some cash, which can be put towards other upgrades, but you would get the same performance for the most part - not mention you would need only 4 PCIe power cables versus 6, giving you less cable clutter.

But in the end, it's your call. At stock you'd be good with any pair of GTX 580's.
     
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post #23 of 40
Thread Starter 
Quote:
Originally Posted by Cryptedvick View Post
Yes its enough. Even if you plan on overclocking.
It seems that everybody still is on the overestimating power draw bandwagon.

edit: check this thread: http://www.overclock.net/power-suppl...alculator.html
The Wattage Calculator gave me 825W.

Quote:
Originally Posted by juano View Post
OP you really ought to take this question to the PSU section, the people here are having way too much trouble with this question. Those saying a kilowatt might do well to hear what the PSU experts in there have to say to you as well.
Yea I'm going to post it there then. I'm even more confused now
post #24 of 40
Quote:
Originally Posted by Eagle1911 View Post
Yea I'm going to post it there then. I'm even more confused now
Why be confused?

Everyone that posted here agrees that you're fine with that psu with stock clocks on two GTX 580s.

And you said you wouldn't OC your cards.
    
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post #25 of 40
Thread Starter 
Quote:
Originally Posted by covertash View Post
In my opinion, it's kind of a waste to buy the Classified cards if they are going to stay stock. These cards were meant for overclocking to hell and back. Keeping them at stock is like buying a Ferrari to only drive local speed limits.

I think you'd be just as happy with a regular pair of reference GTX 580's 1.5GB or 3GB. Not only would you save some cash, which can be put towards other upgrades, but you would get the same performance for the most part - not mention you would need only 4 PCIe power cables versus 6, giving you less cable clutter.

But in the end, it's your call. At stock you'd be good with any pair of GTX 580's.
The EVGA US Shop says 10$ difference between the regular EVGA GTX 580 3GB and the Classified one. And EVGA EU Shop says 50 euro difference. LOL

Anyway I really like the look of this card so thats why I want it. It also has higher clocks at stock, better cooling, and is a special OC card.
post #26 of 40
Thread Starter 
Quote:
Originally Posted by MrTOOSHORT View Post
Why be confused?

Everyone that posted here agrees that you're fine with that psu with stock clocks on two GTX 580s.

And you said you wouldn't OC your cards.
Yea thats right. But I want to be 100% sure of this, so I'll link this topic to the PSU section.
post #27 of 40
For whatever it's worth, two 470s @ 850 core, running furmark, with an i5-2500k @ 5GHz doing Prime 95 for about 25 minutes...



I have a pump, 5 3k rpm fans, 2 1500rpm fans, 1 hdd, 1 ssd, 5-6 usb devices, and a partridge in a pear tree running off it as well. I've also folded at 5GHz, 900 core on both cards, with a 9800GT volt modded running 820 core 1842 shader without issue for several days.

I can't see you having any problems whatsoever running stock 580s, but as others have said you should take your question to the PSU section
    
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post #28 of 40
If you will not run Furmark and Prime at the same time, then the 850W will suffice.

If however, you overclock the classifieds far, they will pull quiet a bit more wattage especially with more vcore. You need to be careful. Take a look at the link in my signature. It will give you an idea of what some systems pull.

If you look at one of the posts, overclocking the CPU from 3.6 and overclocking the GPU's an extra 50Mhz, the power draw went up 70W's. It all adds up.
Edited by AMC - 10/4/11 at 10:08pm
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post #29 of 40
Thread Starter 
Oke guys thanks.

Even if my PSU wouldn't handle SLI 580 Classified's I probably need to underclock my CPU.

BTW the TDP of a single Classified is 286W vs. 244W compared to regular 580's. The cards come actually overclocked so thats another thing to keep in mind. So I have to try and see and hope to take no damage on my components.

Power Consumption info: http://www.guru3d.com/article/evga-g...ified-review/6
post #30 of 40
You really, and I mean really!!!! do not need to underclock the CPU. The HX850 can handle the 920 + 2 OC'd 580s.
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