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PSU for Dual 4870x2 - Page 4

post #31 of 109
Quote:
Originally Posted by obsidian86 View Post
800 from the wall or 800 from the psu?
wall and i have a 90% efficient PSU so thats 720W and it would be even higher now because that number was when my cards were at stock voltage 940mhz, they are both at 1020mhz 1.265v now
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post #32 of 109
Quote:
Originally Posted by thealex132 View Post
Just ugh wut.
1kw is not needed at all.
Recommended PSU from ATI was 650W at 70% efficiency.
and the 1000w is also 70% efficiency, AMD/Nvidia always idiot-proof those requirements so that practically any PSU at that rated wattage will run it ok.
it takes no genious to figure out 70% of 1000w = 700w. So I would reccomend a good quality 850w such as the Corsair AX850, XFX 850w or the Seasonic X850. All of these units are very high quality and made by Seasonic, so each will pull up and beyond 850w with gold/silver (87-89%) rated efficiency. They also can pull up to 840w on the 12v IIRC
Did you skip past the part were I said 850w at minimum?
post #33 of 109
Quote:
Originally Posted by Blindsay View Post
wall and i have a 90% efficient PSU so thats 720W and it would be even higher now because that number was when my cards were at stock voltage 940mhz, they are both at 1020mhz 1.265v now
so 800 watts from the psu while running linx and furmark? do you run them 24/7 or do you use you pc for normal things like gaming or such?

Quote:
Originally Posted by thealex132 View Post
Just ugh wut.
1kw is not needed at all.
Recommended PSU from ATI was 650W at 70% efficiency.
and the 1000w is also 70% efficiency, AMD/Nvidia always idiot-proof those requirements so that practically any PSU at that rated wattage will run it ok.
it takes no genious to figure out 70% of 1000w = 700w. So I would reccomend a good quality 850w such as the Corsair AX850, XFX 850w or the Seasonic X850. All of these units are very high quality and made by Seasonic, so each will pull up and beyond 850w with gold/silver (87-89%) rated efficiency. They also can pull up to 840w on the 12v IIRC
you got efficiency backwards a good psu will do its rated power, efficiency is to do with the conversion of power and the loss during conversion
Edited by obsidian86 - 4/18/11 at 10:00am
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post #34 of 109
Has anyone noticed that people running single/Crossfire 4870x2's have all said 850w+

And people who have never run these cards are all saying 750w or less?
post #35 of 109
I'm no PSU expert but check this review out, it provides a power consumption chart for a 4870x2 CrossFireX - system peaks at 755w.

Quote from review:

Quote:
It should be noted that the Radeon HD 4870 X2 was run on the Coolermaster 1000W power supply when running in CrossFireX mode as the Corsair HX 620W power supply was unable to handle the load.
Not making recommendations, just more info to chew on...
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post #36 of 109
Quote:
Originally Posted by Blindsay View Post
Why risk it, no point in running your psu that damn near its max all the time. if i can pull 800w+ with a pair of 6970s i think you will need something bigger for a pair of 4870X2s they were not exactly power friendly
That's either BS or you have TONS of peripherals.

Legit Reviews pulled 596W with a Radeon HD 6970 CrossFire AND a Core i7 970. And that's at the wall. Accounting for 80% efficiency, the PSU only has to deliver 477W.
    
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post #37 of 109
Quote:
Originally Posted by Skylock View Post
I'm no PSU expert but check this review out, it provides a power consumption chart for a 4870x2 CrossFireX - system peaks at 755w.

Quote from review:



Not making recommendations, just more info to chew on...
I see. Well, given the fact this is at the wall, the PSU has to deliver 604W if it's 80% efficient.
    
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post #38 of 109
Quote:
Originally Posted by philhalo66 View Post
neither one of you know what your talking about, just leave while you're behind.


@OP It's your choice, really. Either listen to people with some actual credibility, or listen to idiots that don't know jack about Powersupplies.
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post #39 of 109
Quote:
Originally Posted by scatteh316 View Post
Did you skip past the part were I said 850w at minimum?
Minimum =/= reccomended

Quote:
Originally Posted by LOL_Wut_Axel View Post
That's either BS or you have TONS of peripherals.

Legit Reviews pulled 596W with a Radeon HD 6970 CrossFire AND a Core i7 970. And that's at the wall. Accounting for 80% efficiency, the PSU only has to deliver 477W.
6970 pulls a little more than a 5870, my 5870's in crossfire needed up and beyond a 650w unit. So I'm guessing they were pulling 600-ish at least
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post #40 of 109
Quote:
Originally Posted by GameBoy View Post


@OP It's your choice, really. Either listen to people with some actual credibility, or listen to idiots that don't know jack about Powersupplies.
I run 4870x2 Quad-Fire

My ACTUAL experience >>>>>> Your OPINION
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