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GTX 670 SLI?

Last response: in Graphics & Displays
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a b U Graphics card
January 22, 2013 3:22:25 PM

The only problem is that it does not have enough 6-pin connectors. Your only choice is to use molex to 6-pin adapter I guess.
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a c 160 U Graphics card
January 22, 2013 3:24:40 PM

What is the exact PSU model? They differ a lot even though they are rated for 620w, it can deliver less or more.

Seasonic usually makes great PSUs, but you would be cutting it VERY close with a 620w...

EDIT : OK i see you added the link, sorry.

You shoudl be fine, close though. Just do not OC on that little pwoer.

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January 22, 2013 6:40:11 PM

Is there a risk using the molex connectors?
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a b U Graphics card
January 22, 2013 6:51:33 PM

Correct me if i'm wrong but this is how I understand it... So that PSU has 2 12v rails... each with 24amps on it... meaning each one can supply 288w (12x24). I thought the CPU and GPU's used 12v rails... Meaning he would have 1 GPU on 1 12v rail and then his CPU + GPU on the second... Meaning he would only have 288w for 1 GPU + CPU. That seems like he is going to be cutting it pretty close, if it indeed works the way i thought it did. He might be able to get by but it would be with very little to no overclocking and would push one rail pretty close to its limit (not a good idea).
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a c 271 U Graphics card
January 22, 2013 7:02:18 PM

Nvidia lists the GTX670 as 170w cards which is the same requirement as my 560Ti's and I've been running two of them on a six, nearly seven year old 620w PSU since March 2011 and I'm having to use molex connectors for the extra 6 pin PCIe connectors.
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a b U Graphics card
January 22, 2013 7:09:59 PM

Mousemonkey said:
Nvidia lists the GTX670 as 170w cards which is the same requirement as my 560Ti's and I've been running two of them on a six, nearly seven year old 620w PSU since March 2011 and I'm having to use molex connectors for the extra 6 pin PCIe connectors.


Does your PSU have one or two 12v rails? That is the main issue here. His 620w PSU is basically split in half on 2 rails, so one GPU and his CPU have to share half the PSU: 288w (12v x 24amps = 288w). Not knowing your PSU but i would assume it is something like one 12v rail with 48-52 amps. Making it so your PSU can be fully used (all 600ish watts) by both GPUs and CPU.

In his situation about 118w (288w - 170w(1gpu max power usage))is not going to be used.. Meaning he is really only able to use ~500w of his PSU. If it indeed works the way I understand it to work.

Hmm after more thinking... It might be using one rail just for CPU... leaving the other rail (288w) for both GPU's... I am unsure about this so would like some feedback if i am misleading him in anyway.
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a c 160 U Graphics card
January 22, 2013 7:19:35 PM

Mousemonkey said:
Nvidia lists the GTX670 as 170w cards which is the same requirement as my 560Ti's and I've been running two of them on a six, nearly seven year old 620w PSU since March 2011 and I'm having to use molex connectors for the extra 6 pin PCIe connectors.


To be fair, I hear very bad things about the "extreme" series. And both I have owned have given me issues as well.
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a c 271 U Graphics card
January 22, 2013 7:20:22 PM

The OP's PSU looks to have very similar connectors to mine and although mine is a Corsair it was made for them by Seasonic.
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a b U Graphics card
January 22, 2013 7:22:47 PM

Mousemonkey said:
The OP's PSU looks to have very similar connectors to mine and although mine is a Corsair it was made for them by Seasonic.


Do you know how many 12v rails your PSU has? and how many AMPS per rail? or maybe a model number? Just want to know because if yours is truly setup like his (two 12v rails with 24 amps each) then he might be alright...
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a c 160 U Graphics card
January 22, 2013 7:23:45 PM

Mousemonkey said:
The OP's PSU looks to have very similar connectors to mine and although mine is a Corsair it was made for them by Seasonic.


Seasonic = VERY good PSU's. LOL
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a c 271 U Graphics card
January 22, 2013 7:26:02 PM

Derza10 said:
Do you know how many 12v rails your PSU has? and how many AMPS per rail? or maybe a model number? Just want to know because if yours is truly setup like his (two 12v rails with 24 amps each) then he might be alright...

Corsair HX620's are the PSU's that I'm using.
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a b U Graphics card
January 22, 2013 7:27:54 PM

Grab an HX 750 for $30 more
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a b U Graphics card
January 22, 2013 7:32:04 PM

Mousemonkey said:
Corsair HX620's are the PSU's that I'm using.

Ah see yours has Three 12v rails with 18 amps (216w) on each rail, Meaning you will have 216w for your CPU, and 216w for each GPU, That is why you don't have any power issues... His on the other hand will be close to if not overloading one of the 12v rails. I would suggest getting a new PSU OP. It is better to be safe than sorry, and you would be really pushing it with that PSU.
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a c 160 U Graphics card
January 22, 2013 7:32:28 PM

Mousemonkey said:
Corsair HX620's are the PSU's that I'm using.


MUST... CONTROL... GRAMMARNAZI... IN... ME... :D 

Those are VERY good, have always been, although its that old.
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a c 271 U Graphics card
January 22, 2013 7:35:14 PM

Novuake said:
MUST... CONTROL... GRAMMARNAZI... IN... ME... :D 

Those are VERY good, have always been, although its that old.

What was wrong with my grammar? :??: 
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a b U Graphics card
January 22, 2013 7:40:48 PM

Your use of 's.
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a c 271 U Graphics card
January 22, 2013 7:45:15 PM

Derza10 said:
Your use of 's.

Both of my rigs are powered by HX620's. :whistle: 
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a c 160 U Graphics card
January 22, 2013 7:46:05 PM

Mousemonkey said:
What was wrong with my grammar? :??: 


haha at first i thought it was the use of "are", then I realized you are referring to your PSU in multiple.

Not really grammar related, but still confused the hell out of me...
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a b U Graphics card
January 22, 2013 7:47:08 PM

Mousemonkey said:
Both of my rigs are powered by HX620's. :whistle: 


You would use 's if you said something like "My HX620's cables are long" it would just be HX620s otherwise... but really who cares this isn't an english paper.
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a c 160 U Graphics card
January 22, 2013 7:48:59 PM

Mousemonkey said:
Both of my rigs are powered by HX620's. :whistle: 


My apologies then!!! :o  :D 
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a c 271 U Graphics card
January 22, 2013 7:49:35 PM

Novuake said:
haha at first i thought it was the use of "are", then I realized you are referring to your PSU in multiple.

Not really grammar related, but still confused the hell out of me...

Hey, I liked the first one so much I bought another one and then built a rig to put it in! :lol: 
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a c 160 U Graphics card
January 22, 2013 7:55:16 PM

Mousemonkey said:
Hey, I liked the first one so much I bought another one and then built a rig to put it in! :lol: 


Hahaha I have had that thought with some chassis before. Haha end up suggesting it to friends just so that I can build it again!

EDIT : Just realized how much of a geek I am... :heink: 
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January 22, 2013 7:59:46 PM

Since cable mangement was pain in the ass..

If I were to get a new PSU,(Made by seasonic), can I just unplug all the wires, remove the PSU, Install the new PSU and just reconnect the wires? or do I have to unwire EVERYTHING and then start again?
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a b U Graphics card
January 22, 2013 8:03:42 PM

From the pictures of your PSU it looks like most of your wires can not be removed from the PSU... So most likely yes you will need do your cable management all over again. :( 
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a c 271 U Graphics card
January 22, 2013 8:04:33 PM

rockmoon26 said:
Since cable mangement was pain in the ass..

If I were to get a new PSU,(Made by seasonic), can I just unplug all the wires, remove the PSU, Install the new PSU and just reconnect the wires? or do I have to unwire EVERYTHING and then start again?

If the connectors to the PSU are the same then I would assume that it would just be a case of unplugging the old one and plugging in the new one.
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a c 271 U Graphics card
January 22, 2013 8:07:58 PM

Derza10 said:
From the pictures of your PSU it looks like most of your wires can not be removed from the PSU... So most likely yes you will need do your cable management all over again. :( 

It's only the motherboard connectors that would have to be re done.
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a c 160 U Graphics card
January 22, 2013 8:08:34 PM

rockmoon26 said:
Since cable mangement was pain in the ass..

If I were to get a new PSU,(Made by seasonic), can I just unplug all the wires, remove the PSU, Install the new PSU and just reconnect the wires? or do I have to unwire EVERYTHING and then start again?


Mostly unplugging everything is better, this avoid damage to ports and stuff. But yeah it depends on your specific cable layout.
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a b U Graphics card
January 22, 2013 8:09:24 PM

Mousemonkey said:
It's only the motherboard connectors that would have to be re done.


True, I guess it depends on if he used ties to bundle all of his wires together...
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a b U Graphics card
January 22, 2013 8:32:38 PM

This PSU is labeled a dual 12v rail PSU but in fact it is single rail design see bottom of overview page for specifics:

http://www.hardocp.com/article/2010/05/18/seasonic_m12i...

Other than the connectors(molex to PCIE adapter) you will have no issue.

The GTX 670 is a 170 watt card, 170w / 12v = 14.1 amps. We are talking 28.2 amps for the two cards which this PSU can deliver with plenty to spare for CPU etc.

My vote is your golden.
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a b U Graphics card
January 22, 2013 8:42:08 PM

JamesSneed said:
This PSU is labeled a dual 12v rail PSU but in fact it is single rail design see bottom of overview page for specifics:

http://www.hardocp.com/article/2010/05/18/seasonic_m12i...

Other than the connectors(molex to PCIE adapter) you will have no issue.

The GTX 670 is a 170 watt card, 170w / 12v = 14.1 amps. We are talking 28.2 amps for the two cards which this PSU can deliver with plenty to spare for CPU etc.

My vote is your golden.


If that is true then you should be fine with your current PSU... I find it weird that they would label it with Two 12v - 24amp rails if it really only has one 48 amp one...

Edit: Yup looks like you will be fine :)  get your second GTX 670 and go at it!
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January 22, 2013 9:59:09 PM

Best answer selected by rockmoon26.
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January 22, 2013 9:59:31 PM

Okay! Thanks guys!
Now I just need more money and monitors lol!
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!