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Multirail or Single Rail?

post #1 of 22
Thread Starter 
Hi,

I made the mistake of assuming a Corsair CX400 was suitable for my Asus EAH6850 DirectCU. Now, it seems I need to upgrade.

I have found two PSU's within my budget, that should be suitable.
http://www.cclonline.com/product-inf...=ocz600sxs2-uk

http://www.cclonline.com/product-inf...021&tid=frooct

The OCZ one has 4 12V rails @ 18A....is this okay? The corsair has 1 12V rail @ 40A.

The Asus EAH6850 DirectCU is thought to use at least 40A on the 12V rail.

So, which is the better choice?

Thanks for your help,
5867dude
The Budget Build
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CPUMotherboardGraphicsRAM
AMD Athlon II X4 620 @ Stock Gigabyte M720-US3 Asus EAH6850 DirectCU @ 920/1150 Stock Volts. 4GB DDR2 800Mhz 
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1TB Samsung Spinpoint F3 Acer V223w (1680x1050) Microsoft Wired Keyboard 600 Corsair CX400 
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The Budget Build
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CPUMotherboardGraphicsRAM
AMD Athlon II X4 620 @ Stock Gigabyte M720-US3 Asus EAH6850 DirectCU @ 920/1150 Stock Volts. 4GB DDR2 800Mhz 
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1TB Samsung Spinpoint F3 Acer V223w (1680x1050) Microsoft Wired Keyboard 600 Corsair CX400 
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Logitech G400 
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post #2 of 22
The corsair is the better choice, not because it's corsair, or single rail, but because that OCZ isn't great.
Wait... that's the CX600... also not the best of choices..

If it were me, I'd find another 20 quid or so and go get an Antec TPN650 or the XFX Pro 650
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post #3 of 22
the corsair is miles better, but don't get a CX moddel, go with a TX or HX
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post #4 of 22
Thread Starter 
The Budget Build
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CPUMotherboardGraphicsRAM
AMD Athlon II X4 620 @ Stock Gigabyte M720-US3 Asus EAH6850 DirectCU @ 920/1150 Stock Volts. 4GB DDR2 800Mhz 
Hard DriveMonitorKeyboardPower
1TB Samsung Spinpoint F3 Acer V223w (1680x1050) Microsoft Wired Keyboard 600 Corsair CX400 
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Logitech G400 
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The Budget Build
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CPUMotherboardGraphicsRAM
AMD Athlon II X4 620 @ Stock Gigabyte M720-US3 Asus EAH6850 DirectCU @ 920/1150 Stock Volts. 4GB DDR2 800Mhz 
Hard DriveMonitorKeyboardPower
1TB Samsung Spinpoint F3 Acer V223w (1680x1050) Microsoft Wired Keyboard 600 Corsair CX400 
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Logitech G400 
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post #5 of 22
Most are multi rails split from a single rail. For all recent psus, don't worry about multi or single rail, just focus on the quality and adequate power you need. Depending on the budget, I would look at the Corsair 550vx or 650tx over the two in your link.
post #6 of 22
Single Rail. then you don't have to worried about which cables do where.
    
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post #7 of 22
The StealthXStream 2 600W actually is a pretty good budget unit. The newer Corsair CX series are overrated, stripped down CWT DSA units.

But more importantly, where did you get the idea that a HD 6850 uses 40A on +12V? 10-11A on +12V is more like actual power consumption of a HD 6850 while stress testing on stock clocks; 40A on +12V is 480W lol. Good luck pulling 480W from a PCI-E slot and a 6-pin connector. Your CX400 is a good budget unit that's way more than enough to run a HD 6850, especially considering the CPU is only a Athlon II X4.
post #8 of 22
Thread Starter 
Quote:
Originally Posted by mikeaj View Post
The StealthXStream 2 600W actually is a pretty good budget unit. The newer Corsair CX series are overrated, stripped down CWT DSA units.

But more importantly, where did you get the idea that a HD 6850 uses 40A on +12V? 10-11A on +12V is more like actual power consumption of a HD 6850 while stress testing on stock clocks; 40A on +12V is 480W lol. Good luck pulling 480W from a PCI-E slot and a 6-pin connector. Your CX400 is a good budget unit that's way more than enough to run a HD 6850, especially considering the CPU is only a Athlon II X4.
That is what I thought, but it seems many people are struggling to run the Asus EAH6850 DirectCU on a 30A 12V Rail. In GPU-Z mine frequently goes to 37A, then drops again.
The Budget Build
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CPUMotherboardGraphicsRAM
AMD Athlon II X4 620 @ Stock Gigabyte M720-US3 Asus EAH6850 DirectCU @ 920/1150 Stock Volts. 4GB DDR2 800Mhz 
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1TB Samsung Spinpoint F3 Acer V223w (1680x1050) Microsoft Wired Keyboard 600 Corsair CX400 
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The Budget Build
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CPUMotherboardGraphicsRAM
AMD Athlon II X4 620 @ Stock Gigabyte M720-US3 Asus EAH6850 DirectCU @ 920/1150 Stock Volts. 4GB DDR2 800Mhz 
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1TB Samsung Spinpoint F3 Acer V223w (1680x1050) Microsoft Wired Keyboard 600 Corsair CX400 
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post #9 of 22
Quote:
Originally Posted by 5867dude View Post
That is what I thought, but it seems many people are struggling to run the Asus EAH6850 DirectCU on a 30A 12V Rail. In GPU-Z mine frequently goes to 37A, then drops again.
That's 37A at your VCore. So something like 50W. Plus VRAM and VRMs.



Single rail, multiple rails; it's garbage. Follow the link in my signature and read the myth buster page on it, it will explain what you need to know. And what you need to know is that it absolutely does not matter, at least not when it comes to my recommendations.

A quality 400W would probably handle your needs. Or a 450W. Whatever, maybe the SeaSonic S12II 520W if you're really paranoid.
post #10 of 22
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
That's 37A at your VCore. So something like 50W. Plus VRAM and VRMs.



Single rail, multiple rails; it's garbage. Follow the link in my signature and read the myth buster page on it, it will explain what you need to know. And what you need to know is that it absolutely does not matter, at least not when it comes to my recommendations.

A quality 400W would probably handle your needs. Or a 450W. Whatever, maybe the SeaSonic S12II 520W if you're really paranoid.
That's the problem. It seems odd that a low energy using card needs a high end power supply, but other people on this forum also have a problem with this card on 30A, 12V rails. Linky. He seems to have had his problem sorted since switching to a Corsair TX650W. I'm going to do the same, probably.
The Budget Build
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CPUMotherboardGraphicsRAM
AMD Athlon II X4 620 @ Stock Gigabyte M720-US3 Asus EAH6850 DirectCU @ 920/1150 Stock Volts. 4GB DDR2 800Mhz 
Hard DriveMonitorKeyboardPower
1TB Samsung Spinpoint F3 Acer V223w (1680x1050) Microsoft Wired Keyboard 600 Corsair CX400 
Mouse
Logitech G400 
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The Budget Build
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CPUMotherboardGraphicsRAM
AMD Athlon II X4 620 @ Stock Gigabyte M720-US3 Asus EAH6850 DirectCU @ 920/1150 Stock Volts. 4GB DDR2 800Mhz 
Hard DriveMonitorKeyboardPower
1TB Samsung Spinpoint F3 Acer V223w (1680x1050) Microsoft Wired Keyboard 600 Corsair CX400 
Mouse
Logitech G400 
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