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PSU for 580 SLi? - Page 2

post #11 of 25
Some notes again. 719 Watts is at the wall draw, so assuming an 85% efficiency (being generous) that is a system draw of 611Watts, meaning a good 650Watt PSU could supply your system. A 750 Watt will do it handily, an 850 will give you super OC headroom and a 950 will be overkill. Just something to think about.
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post #12 of 25
Quote:
Originally Posted by ocpokey View Post
Some notes again. 719 Watts is at the wall draw, so assuming an 85% efficiency (being generous) that is a system draw of 611Watts, meaning a good 650Watt PSU could supply your system. A 750 Watt will do it handily, an 850 will give you super OC headroom and a 950 will be overkill. Just something to think about.
Don't quote me on this, but isn't the efficiency/wattage calculated at the description of sale?

Meaning a 90% efficiency PSU at 900W would actually be 990W at 100%?
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post #13 of 25
Quote:
Originally Posted by GameBoy View Post
The TX850 is more than enough for two GTX 580's. The HX1000 is pretty average/outdated.
That power supply must be popular though because most people (including myself) that have looked at 1000W PSUs want to buy one intially and then are told that there are better options. I personally didn't like the aesthetics of most of the other 1000W PSUs, hence why I chose the HX.
post #14 of 25
Quote:
Originally Posted by Buska103 View Post
Don't quote me on this, but isn't the efficiency/wattage calculated at the description of sale?

Meaning a 90% efficiency PSU at 900W would actually be 990W at 100%?
A 90% efficient 900w PSU would supply 900w of DC power. It would draw 990W at the wall (AC Power) at 100% load... the extra power is wasted as heat during the DC conversion.

99% of review sites publish the power consumption figures using a Kill-a-watt or something similar, and this doesn't count in efficiency as it reports AC power.

Quote:
Originally Posted by TheSchlaf View Post
That power supply must be popular though because most people (including myself) that have looked at 1000W PSUs want to buy one intially and then are told that there are better options. I personally didn't like the aesthetics of most of the other 1000W PSUs, hence why I chose the HX.
It's popular because it has a Corsair label on it.
Edited by GameBoy - 3/19/11 at 9:24pm
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post #15 of 25
1000w corsair is plenty. and they make awsome psu i have the 850 and it pushes my sig rig great with no problems. The price is also not too bad considering i spent $140 on my 850 like a year and a half ago.
post #16 of 25
i had a tx750 powering 2 480s sli and i7 overclocked. i shut off pc and the fan was going for 5 mins after. So..... withthe sb cpu you got thats 200watts lower so with power you got u should be fine. Mite want higher amps in psu but i think your fine. the 480 draws 50 more watts then 580, so thare is another 100 watts lowered. you should be fine
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post #17 of 25
Quote:
Originally Posted by GameBoy View Post
A 90% efficient 900w PSU would supply 900w of DC power. It would draw 990W at the wall (AC Power) at 100% load... the extra power is wasted as heat during the DC conversion.

99% of review sites publish the power consumption figures using a Kill-a-watt or something similar, and this doesn't count in efficiency as it reports AC power.



It's popular because it has a Corsair label on it.
So it's like a "Klipsch and Bose both suck because they're name brands and you can get a better value with (insert some other smaller up and coming company here)" kind of debate.
post #18 of 25
Quote:
Originally Posted by TheSchlaf View Post
So it's like a "Klipsch and Bose both suck because they're name brands and you can get a better value with (insert some other smaller up and coming company here)" kind of debate.
Bingo. The HX1000 isn't "bad" though.... it's just very so-so and stupidly overpriced for what it is.
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post #19 of 25
Quote:
Originally Posted by GameBoy View Post
Bingo. The HX1000 isn't "bad" though.... it's just very so-so and stupidly overpriced for what it is.
I think he was actually deriding your opinion. And being an arse toward the audiophiles (who do deserve it sometimes, but what he said was factually incorrect).

The HX1000 is an outdated unit. Its only highlight is good voltage regulation. Efficiency is only 80PLUS standard (when 80PLUS Gold units can be had for a similar price), has +12V ripple around 70mV (competitors around 30-50mV), and is massive due to the extreme redundancy involved--duplication of the entire secondary side circuit. It's about twice as long and half again as heavy as most PSUs in that price range, and is inferior in performance to everything else in its price range. And because of the redundancy of its design there's a very high materials, parts, and manufacturing cost so it couldn't be made much cheaper even if Corsair wanted that (which they don't).

In short, the HX1000 is coasting on brand recognition and needs to go away.

An HX1050 has appeared on CWT's UL cert page. There's hope that it's a CWT PUC Silver unit, which is the updated version of the PUC platform used in the HX1000 with higher efficiency and better +12V ripple suppression. But it's still not 80PLUS Gold and is still massive and will still likely cost the same or more than the HX1000. At least it wouldn't be completely out of date though.
post #20 of 25
using the HX850 on mine
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