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Which powersupply to get to power 2 X 4870X2 - Page 3

post #21 of 31
Quote:
Originally Posted by elko View Post
Has to be, ! thank you very much.

next day delivery 105£ ill at leased have a psu that i dont have to worry about!
Amen to that!


Quote:
Originally Posted by kcuestag View Post
I don't know why you're surprised?
It's hard to explain, but when I saw that on AMD's site, I kept wondering why they recommended a 650W PSU for a system with a single 4870x2 and then a 1000W PSU for two 4870x2s. I mean, I kept doing a double-take and I ended up over-thinking it. Within a matter of seconds, I was convinced that I needed to knock off the usual 50-100W from the recommendation which is how I settled on the TX950.

However, I kept doubting it because of that 650W recommendation for a system with one 4870x2 in it because every single time AMD has a recommendation for a single card, they always add 100-150W when talking about Crossfire. So they should be recommending a 750W instead of a 1000W, however I imagine that the reason why they're recommending a 1000W is to guarantee that their customers have enough PCI-E connectors.


Quote:
Originally Posted by kcuestag View Post
I never believe anything of what AMD states about requirements of their GPU's, neither Nvidia.

For example, on my Sapphire HD6970's, each of them says minimum of 600W, while with x2 HD6970's, and i7 2600k @ 4.8Ghz, using prime 95 + furmark on both cards, I could never get to see above 500W.
That's because they're trying to cover the possible (and likely) usage of peak-rated PSUs.

So check it out: AMD recommends a 550W power supply to power a system with a single 6970 in it (source), so that tells me that a quality 450-500W would totally be enough since they're referring to 550W peak-rated PSUs.
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post #22 of 31
The most simple answer is that you will run it fine with much less than you are anticipating needing.

If you want solid evidence, buy yourself a Kill-A-Watt and check the draw of your system from the wall.

you will find that on idle you need next to nothing. If you are overclocking your cards/CPU/ram/etc, you will need a 'bit' more. I would suggest a solid 850 for overclocking headroom. The Seasonic models (sold under corsair, too, such as the AX-850) would more than meet your needs.

Don't cheap out on your power supply - you will regret it in the long run when it dies/fries something, and you have to either replace it and/or replace the parts that it fried. Your PSU should always be a good, reliable brand.

If you can't afford a good PSU, you should really hold off on your other purchases.
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post #23 of 31
aesthetics1, you may want to remove that line in your sig where you are asking for Rep. We aren't allowed to ask each other for Rep in any way; they call it "rep abuse". We aren't even allowed to hint at it.
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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post #24 of 31
A good 750W would be fine.
Check http://www.overclock.net/power-suppl...al-4870x2.html for a lengthy discussion about that. Feel free to skip to the end where the OP confirmed everything was working great on his Corsair TX750. Get a better unit than the old Corsair TX750 though, such as the TX750 V2.
post #25 of 31
Thread Starter 
This
http://www.ebuyer.com/product/257234

or this

http://www.ebuyer.com/product/200490


I really dont fancy the 100 mark for a PSU.
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post #26 of 31
Quote:
Originally Posted by elko View Post
This
http://www.ebuyer.com/product/257234

or this

http://www.ebuyer.com/product/200490


I really dont fancy the 100 mark for a PSU.
I'm going to sound like a Corsair fanboy for this, but the Corsair in this comparison is much better. So for the love of your system, I recommend it.
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #27 of 31
The Cooler Master GX 750 is a 450W PSU at best. It'll blow up if you connect two 4870X2 to it. Don't even think about it.
http://www.ebuyer.com/product/257233 is cheap and will do the trick. It's the cheapest yet high quality unit on ebuyer that I can see in the 750W range.
post #28 of 31
Quote:
Originally Posted by philhalo66 View Post
your going to need alot more power than 750 watts to run 2 of those. amd recommends a 1200 watt minimum.
No.

Quote:
Originally Posted by TwoCables View Post
I still have my doubts because as I said, AMD recommends a 1000W power supply to power a system with two 4870x2s in it.

So why take a chance? Get something with more power such as the TX950 (great PSU, great price).
AMD/Nvidia's pwoer recommendations are always inflated. 750/850w is ample for two 4870 X2's.
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post #29 of 31
Quote:
Originally Posted by GameBoy View Post
No.



AMD/Nvidia's pwoer recommendations are always inflated. 750/850w is ample for two 4870 X2's.
I know.

Read through the thread and you'll see what I said after I posted that.

Besides: you know I know this. Haven't you seen me say things like, "AMD and NVIDIA's power supply recommendations are talking about peak-rated power supplies"?
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #30 of 31
Quote:
Originally Posted by TwoCables View Post
I know.

Read through the thread and you'll see what I said after I posted that.
My bad, sorry.

@Elko This XFX unit is much better and only slightly more expensive: http://www.scan.co.uk/products/750w-...-12v-135mm-fan

Edit: Or get this: http://www.scan.co.uk/products/750w-...-12v-135mm-fan Same internals as the TX V2 but the price is a little cheaper. The XFX Black Edition 750 is still better though.
Edited by GameBoy - 5/6/11 at 12:14pm
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