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PSU required for 2x5850

post #1 of 11
Thread Starter 
They will be bitmining, as with the cheap-as-bread electricity costs in my country, I earn minimum wage(here in Venezuela) with my 5770.

I need to know how many Amps. in +12V do this gpus require(they will be at max load), with an 65W CPU mostly idling.
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Good Enough Rig
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post #2 of 11
A good quality 650w will be fine, 5850's are some of the most energy efficient cards.
post #3 of 11
Antec EA750W will be more than fine for you.
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X79-GCN
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post #4 of 11
If the PSU in your sig is an Ultra LSP-650, it's a good thing you're getting rid of it anyway.
A good 550W unit would be fine for a pair of 5850s, no need for more wattage.
post #5 of 11
Quote:
Originally Posted by Shub View Post
If the PSU in your sig is an Ultra LSP-650, it's a good thing you're getting rid of it anyway.
A good 550W unit would be fine for a pair of 5850s, no need for more wattage.
Agreed. A quality 550W is absolutely plenty.
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Intellect v2
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post #6 of 11
Guys, I'm considering buying a second sapphire 5850 extreme, a quad crossfire and sli Z58 motherboard whenever they're out which is meant to be soon, and an i5 2500 (or AMD bulldozer 8 core if it's as good, better or cheaper) to replace my 3.8ghz overclocked x2 550BE. My PSU is the 650w XFX Pro Core Edition. I've also got an OCZ 700w modxstream which is sli certified but it's broken and I haven't RMA'd it yet. Will the XFX be sufficient to run these in crossfire as well as everything else? It's not crossfire certified to my knowledge. If it's suitable, I've got a couple of 6 pin to molex adapters that came with my 5850, so they could be used to connect the second 5850?

Oh, my XFX comes with 2 x 6+2pin and 2 x 6pin so it must be good for crossfire?
Edited by Roman5 - 5/9/11 at 7:29pm
    
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Phenom II 550BE O/C @ stock 3.1 Ghz Gigabyte GA-MA770-UD3 rev 2.0 Sapphire HD 5850 Extreme 1GB Patriot Viper 2x2GB DDR2 6400 
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Phenom II 550BE O/C @ stock 3.1 Ghz Gigabyte GA-MA770-UD3 rev 2.0 Sapphire HD 5850 Extreme 1GB Patriot Viper 2x2GB DDR2 6400 
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post #7 of 11
Quote:
Originally Posted by Roman5 View Post
Guys, I'm considering buying a second sapphire 5850 extreme, a quad crossfire and sli Z58 motherboard whenever they're out which is meant to be soon, and an i5 2500 (or AMD bulldozer 8 core if it's as good, better or cheaper) to replace my 3.8ghz overclocked x2 550BE. My PSU is the 650w XFX Pro Core Edition. I've also got an OCZ 700w modxstream which is sli certified but it's broken and I haven't RMA'd it yet. Will the XFX be sufficient to run these in crossfire as well as everything else? It's not crossfire certified to my knowledge. If it's suitable, I've got a couple of 6 pin to molex adapters that came with my 5850, so they could be used to connect the second 5850?
Easily. You have a good amount of power left to overclock all that stuff too (edit: that's with the i5-2500k. The 8-core Bulldozer might use something like 60W more at stock, with the difference widening when overclocked. You'd have room with the 8-core Bulldozer, just not huge amounts.) It's the same internally as the TX650 V2, and Crossfire/SLI certification doesn't really mean that much anyway. For a unit like this, it just means that they didn't pay to have it tested for certification, not that it's lower quality or couldn't handle it. Anyway, XFX's version should have 4 PCI-E connectors natively (the Corsair TX650 V2 only has 2, probably in an attempt to get people to buy the higher-wattage units, even though the TX650 V2 is capable of much more).

As can be seen by reviewers who properly tested the unit, it's very solid:
http://www.jonnyguru.com/modules.php...Story&reid=216
http://hardocp.com/article/2011/01/3...supply_review/
http://www.hardwaresecrets.com/artic...ly-Review/1165
Edited by mikeaj - 5/9/11 at 7:31pm
post #8 of 11
Thanks mikeaj, good to hear.
Yes, I've since found out that it has all the 4 pci-e connectors I need for 2 cards, and scan.co.uk has it down as SLI/CrossFire. Excellent. I just thought I'd be looking at 800w or more, but obviously not really needed.

Oh btw, I already have the XFX, bought it a few months back, in case you thought I meant I was considering buying it. Very happy with it so far. I just forgot or didn't realise how many connectors it came with that I've stuffed through the back of my case
Edited by Roman5 - 5/9/11 at 7:43pm
    
CPUMotherboardGraphicsRAM
Phenom II 550BE O/C @ stock 3.1 Ghz Gigabyte GA-MA770-UD3 rev 2.0 Sapphire HD 5850 Extreme 1GB Patriot Viper 2x2GB DDR2 6400 
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Samsung SSD 830 128GB / WD Caviar Black 1TB sat... Sony Optiarc AD 7243S W7 x64 23" Samsung S23A700D 3D+120Hz 
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Razer Lycosa XFX Pro 650w Core Edition CM 690. 5x120mm fans: AC Ryan, Xigmatek, Enermax Logitech MX518 1800dpi 
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Steelseries qck mini. Puretrak Stealth. 
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CPUMotherboardGraphicsRAM
Phenom II 550BE O/C @ stock 3.1 Ghz Gigabyte GA-MA770-UD3 rev 2.0 Sapphire HD 5850 Extreme 1GB Patriot Viper 2x2GB DDR2 6400 
Hard DriveOptical DriveOSMonitor
Samsung SSD 830 128GB / WD Caviar Black 1TB sat... Sony Optiarc AD 7243S W7 x64 23" Samsung S23A700D 3D+120Hz 
KeyboardPowerCaseMouse
Razer Lycosa XFX Pro 650w Core Edition CM 690. 5x120mm fans: AC Ryan, Xigmatek, Enermax Logitech MX518 1800dpi 
Mouse Pad
Steelseries qck mini. Puretrak Stealth. 
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post #9 of 11
Quote:
Originally Posted by fabrizziop View Post
They will be bitmining, as with the cheap-as-bread electricity costs in my country, I earn minimum wage(here in Venezuela) with my 5770.

I need to know how many Amps. in +12V do this gpus require(they will be at max load), with an 65W CPU mostly idling.
Dont you DARE steal my BTC, im currently using a single HD5850 at 5870 speeds and can pull 3 to 5 BTC a day >

On topic, a nice 650w will do fine.
Oppress This!
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Oppress This!
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post #10 of 11
A single HD5850 will draw a max of 100W on its own. (8'ish amps)
My System
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My System
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