GTX 670 SLI - different clock speeds

ShadowProject · Jan 19, 2015

Hi Everyone

I currently have an asus gtx670 dc2t card which is running 1170 clock with 1270 boost. I am looking at getting a secondhand gtx670 dc2 which is not OC - 980 clock with 1070 boost. My understanding is that the higher clocked card drops to match the lower? Can anyone confirm?

Also I have a seasonic 650 psu, will that be sufficient for two gtx670 in SLI?

Thanks in advance

tawhiri · Jan 19, 2015

I have 2 670s in my current computer. Until recently I had a 750w PSU. It lasted about a year with the SLI setup, and I replaced it with an 850w PSU about 6 weeks ago. 750 is the recommended minimum for 2 670s. If you're powering a lot of other components or overclocking, I would recommend going higher. I do not believe you will get good results with a 650w.

It is my understanding that the faster GPU will downclock to match the speed of the slower.

17seconds · Jan 19, 2015

You are correct that the OC card will downclock to match the speed of the slower card. In terms of your power supply, you are really a little underpowered. It may work, but that depends on your other system components.

Here is Guru3D's power supply recommendation:

GeForce GTX 670 - On your average system the card requires you to have a 500~550 Watt power supply unit.
GeForce GTX 670 2x SLI - On your average system the cards require you to have a 700 Watt power supply unit as minimum.
http://www.guru3d.com/articles_pages/geforce_gtx_670_2_and_3way_sli_review,4.html

ShadowProject · Jan 20, 2015

17seconds :

I thought I might be pushing on the PSU side of things. Easy decision!

RobCrezz · Jan 20, 2015

You can use MSI afterburner to match the clocks speeds of both.

ShadowProject · Jan 21, 2015

RobCrezz :

Yeah, I have precision X OC'ing my current card (which was already factory OC'd). The card I was going to get was stock, not OC'd so I dont think i would get anywhere near my existing card.

RobCrezz · Jan 21, 2015

ShadowProject :

You would be surprised. In my experience the factory overclocked cards rarely have any more potential to overclock more. In some cases reference cards get the best overclocks.

ShadowProject · Jan 21, 2015

RobCrezz :

I understand your angle here. But there is no guarantee whether I get 5% or 25% extra out of it. In your opinion, would you buy a stock or OC version of the same card if you planned to OC it yourself? My understanding was generally factory overclocked cards are the boards with higher quality scores - less likely to fail under extra load?

RobCrezz · Jan 21, 2015

ShadowProject :

Just a regular version with whatever cooler you want. Its only really the mega high end cards that truely get "binned" as higher clocking chips, like MSI Lightning, Asus Matrix Plat, EVGA Classified/Kingpin. The regular OC/SC version are simply too high in volume to be "binned", the factory OCs are so small that pretty much every card will do them speeds.

Its entirely possible that the regular 670 DC2 card will clock just as high as the DC2T card.

ShadowProject · Jan 21, 2015

RobCrezz :

ShadowProject :

Just a regular version with whatever cooler you want. Its only really the mega high end cards that truely get "binned" as higher clocking chips, like MSI Lightning, Asus Matrix Plat, EVGA Classified/Kingpin. The regular OC/SC version are simply too high in volume to be "binned", the factory OCs are so small that pretty much every card will do them speeds.

Its entirely possible that the regular 670 DC2 card will clock just as high as the DC2T card.

Good to know for next time I buy a GPU. Might save me $100 on an OC version

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