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Why do PSUs have a 3x6+2 1x6 PCI-e connector setup?

post #1 of 10
Thread Starter 
As an example, this XFX 650w has:

PCI-Express Connector 1 x 6-Pin, 3 x 6+2-Pin

This isn't uncommon, other supplies have this sort of configuration. But what is it good for? If you have two identical cards, they're going to need an equal number of pins. You couldn't do 2 cards with 8+8 this way, you'd end up 2 pins short. So why not just make 4x6+2?

Anyway, I'm gonna CF my 5850s which use 6+6, so I'd be ok with this psu. But for future upgrades... are there cards that use 8+8 pin configurations that this PSU couldn't serve? Are there adapters to turn 6 pins into 8 pins if needed?
    
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post #2 of 10
yes. Graphics cards usually ship with them. they are either 4 pin molex to 6pin or dual 6pin to single 8pin PCI.

My XFX Black Edition 750W has 4 6+2 pin cables

EDIT:: Look here is what a EVGA GTX580 will come with.

a 2 molex to 6pin and a dual 6pin to 8pin adapter


Edited by tx-jose - 6/8/11 at 2:45pm
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post #3 of 10
There are very few cards with 8+8, most of the big ones are 8+6. There are only a very few ultra-high-end cards with more than that.
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post #4 of 10
I mean what cards needs 2 x 6+2?
A 650w won't power them so what's the use putting them on there?
post #5 of 10
Quote:
Originally Posted by Spooony View Post
I mean what cards needs 2 x 6+2?
A 650w won't power them so what's the use putting them on there?
Asus has a couple of cards with 2x8 pin and 1x6 pin in the mars range, the dual 6970 and dual 580 both take a lot of power.
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post #6 of 10
Now way your going to power to two 6990 with a 650w
post #7 of 10
Quote:
Originally Posted by allikat View Post
Asus has a couple of cards with 2x8 pin and 1x6 pin in the mars range, the dual 6970 and dual 580 both take a lot of power.
Asus GTX580 DCII have 8+8.
post #8 of 10
They do that so you can have two 1x6+2/1x6 pin cards. You won't need the other 6+2, so they cheap out and don't make it.
    
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post #9 of 10
You can always use adapters.
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post #10 of 10
I thought it was bad ideal to use adapters?
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