Which power connector 6+2?

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gepisar

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Jun 9, 2014
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I have a Coolermaster B700. It has 4 x 6+2pin PCI-E Power leads. Essentially, this is two bundles from the PSU each with 2x(6+2pin) Im attaching a R9 280. It requires 8pin + 6pin. Should I use one bundle (i.e 6+2 and 6 from one lead) or can/should I mix i.e. use 6+2 from one lead, and 6 from the other lead? The specs on the PSU say its not SLI compatible, but then why two bundles of 2x(6+2)? Many thanks
 
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It makes absolutely zero difference if it is single or multi rail, they all connect to the same 12V source. The only time you MIGHT want to split it is if it WERE a multi rail with low current limits, so the above makes no sense.

As its a modular supply you of course want to use two from the same "bundle". Otherwise you're running extra cable for no reason.

All SLI compatible means is someone paid Nvidia off and did some extra testing to get SLI printed on the box. Its meaningless. If it can cleanly provide the power and has the connectors its SLI/crossfire compatible.

That being said it is a budget model from coolermaster and they have a reputation for selling junk, especially in their budget lines. Id have never recommended...
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ingtar33

ingtar33

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Dec 17, 2012
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good question... well that card needs around 24amps or so on the 12V rail, and that psu can kick out like 50 amps... so in theory it should be alright, i'd use the plugs from the same bundle though... if that's a dual rail psu, those could be from seperate rails... and you don't want 1 card on 2 rails of power.
 
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unksol

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Sep 12, 2011
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It makes absolutely zero difference if it is single or multi rail, they all connect to the same 12V source. The only time you MIGHT want to split it is if it WERE a multi rail with low current limits, so the above makes no sense.

As its a modular supply you of course want to use two from the same "bundle". Otherwise you're running extra cable for no reason.

All SLI compatible means is someone paid Nvidia off and did some extra testing to get SLI printed on the box. Its meaningless. If it can cleanly provide the power and has the connectors its SLI/crossfire compatible.

That being said it is a budget model from coolermaster and they have a reputation for selling junk, especially in their budget lines. Id have never recommended buying it but I can't find any reviews for it either. Since the R9 280 card only needs 200W/16.6A at stock and 240W/20A on some custom boards you have plenty of room but I would plan to keep the whole system around under 500W as its only rated for 660W on the 12V and coolermaster quality is iffy.
 
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gepisar

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Jun 9, 2014
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I actually found the manual on the R9 280 (which is what i was looking for and why i posted the question)- and the answer according to the installation guide is that one bundle is to be used in 6+2pin and then then other bundle is to be used as a 6pin. (I tried using one bundle for both 6+2 and 6, and it didnt work) So, thats answers that, as to whether the remaining 6+2 and 6 can be used to power SLI, well, when i upgrade, Ill find out... thanks for the answers! Good point made by ingtar33 : thats what i was wondering, but the PSU in question only has one rail - unksol, yeah, i didnt catch the rating at 660w on the 12v until i checked after it arrived. I thought 700 would give me enough overhead for 2x R9's, but i think I might be pushing the outerlimits there! Many thanks all.
 
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