• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

Overclocking - SLI GTX670

Dirk Diggler

Dirk Diggler

Dirk Diggler

Soldato
Joined
6 Jan 2013
Posts
22,449
Location
Rollergirl
I had one GTX670 and have found it's sweet spot for OC purposes. I added another recently, but have kept it stock as I bought it second hand and wanted to make sure it was working OK.

I've had my SLI setup running for a couple of weeks without issue, and I'm now ready to OC the 2nd card. Do I OC them together with the same settings (synch) or do I OC them individually?
 
As you already know what the first card is capable of. Run the new one by itself to see what it can do. Might be worse might be better. If its worse keep your best one in the primary slot, where in sync mode you have to run a compromise oc that suits the weaker card by dropping clocks on the better one. Or you can indeed run both independently at their known clocks, or slightly lower as they may not just hit those speeds when paired up.

For example, my 780s in sig are capable of individually.

+100/300, 1189/3305. Stock boost of 1097, my original card
+80/+500, 1202/3505. Stock boost of 1124, my newest card

Ive so far only ran them in sync where i use +80/300 as i know both are capable of this.
 
Last edited:
OK, in order to OC the 2nd card individually I assume I just disable SLI in Nvidia control panel, and then plug the HDMI cable into the card I'm going to OC? Essentially, the 1st card won't be getting utilised?
 
Tbh im not sure if that works or not. I just tested each card individually with only one in the system at a time. Much easier for me though as im on stock cooling as opposed to your wc setup.
 
setter said:
Tbh im not sure if that works or not. I just tested each card individually with only one in the system at a time. Much easier for me though as im on stock cooling as opposed to your wc setup.
Click to expand...

Yea, water cooling isn't going to allow that easily. Well, I know the 1st card's sweet spot so I can start to OC the 2nd with SLI enabled I suppose.
 
Any chance that the original owner may have some known settings? It is nice to oc them for benches, however as a previous owner of 670 sli theyll cope great in games at stock.
 
I could just run them stock as they are performing great as you say, the real limiter is vram not core or memory clock.

It seems a bit of a shame to put them under water with no OC, but then again the silence is great.
 
Id try both at that to see how things fair, most that can go wrong is a driver fail, if memory is too high youll get artifacting. Heaven or 3d mark firestrike/11 are good quick tests followed by games.
 
Will do.

I just noticed that Afterburner is showing VID useage as 0% for card 2 after a benchmark run. Is that normal?

lQjieA9.png
 
No idea what the vid usage is but mine shows similair. If the bench runs are completing ok and no errors this is a pretty good sign. Any scores you get post them up in the relevant benchmark threads here so you can compare with similair systems.
 
both of my cards overclocked to 1202/7008 luckily. though separate +mhz on both to achieve that. Using MSI after burner, just swap to the other card via settings and OC that its easy no need to disable SLI to do it.
 
have 3 670FTW 4GB's in triSli and have them set at +50MHz for the core and +800MHz on the memory.

Two of them will do 1250 but the other only 1215 so I have them all at 1215. I'm at stock volts as I found increasing the voltage gave no benefit on my cards.
 
Strange thing (well, to me anyway:D )

I had the 1st GPU on it's best OC (+101 core, +525 mem) and the 2nd GPU on stock settings. I was getting a score of 1200 on Heaven benchmark.

After some messing around and various driver crashes, I decided to set a minimal OC on both and work up from there. So, I went for +25 core and +100 mem on both cards. I'm now scoring 1524 on Heaven benchmark.

:confused:
 
Might get more out of both on heaven. Below are a few scores i hit when i had sli 670's.

Score 1957, GPU 670 @1267/1228/1876, CPU 4770k @4.5, setter

Score 1850, GPU 670 @1267/1228/1753, CPU 3770k @4.5, setter

Score 1646, GPU 670 @1189/1150/1502, CPU 3570k @3.8, setter

My top card was a corking oc'er, 1320mhz core, 7500 mem iirc. Third run was with stock speed cards and cpu. Other two were synced compromise oc's on the cards to suit the weaker one.
 
You must log in or register to reply here.
Back
Top Bottom