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NVIDIA GTX 970 OWNERS THREAD

Is anyone here running SLI (2 cards) and monitored the voltages of the two cards?

Seems the voltage bug is present on mine after watching them in GPUZ, followed the advice from another forum and worked out an offset between the two core clocks that syncs the two voltages and everything is running much smoother now. How it works I have no idea as it still ends up with the cards at the same clock in game, but the voltages are definately similar.

I had one at 1.225 and one at 1.108 before sorting it, surprised it didn't crash at stock!

It's a known bug and has been around since the cards were released, god knows why they haven't fixed it yet.

Flashing the BIOS will help sort it
 
I think I've sorted it without resorting to flashing the BIOS...

I have GDDR5 (Samsung) showing up in GPUZ for both cards. However I seem to not be having much luck with memory overclocking. What should the samsung memory be good for?
 
Is anyone here running SLI (2 cards) and monitored the voltages of the two cards?

Seems the voltage bug is present on mine after watching them in GPUZ, followed the advice from another forum and worked out an offset between the two core clocks that syncs the two voltages and everything is running much smoother now. How it works I have no idea as it still ends up with the cards at the same clock in game, but the voltages are definately similar.

I had one at 1.225 and one at 1.108 before sorting it, surprised it didn't crash at stock!

What's the fix, mate? I'm on the brink of upgrading to an i7 as I feel my performance isn't right, but it could be this voltage bug.

Could you link me up?
 
Thanks to Tommytech's post above I am stable.

So I can confirm that this seems to be a preliminary fix until the drivers fix the issue.

This is likely to work for everyone
To sum up what your doing for anyone reading that may be confused. You need to find a delta between the cards.

Card 2 needs to run at a higher core frequency than card 1 in the software your using to overclock. For my setup I found 35mhz is that spot. I can get the cards within 9mv of eachother.

card 1 now runs 1.233v and card 2 runs at 1.225v. Yay, I'm finally out of the 1.1v area on card 1!!!

Step 1. To get this all set up I opened Heaven.

Step 2. I opened afterburner.

Step 3. I set the profiles to not sync identical cards.

Step 4. I set card 2 to +10 and left card 1 at stock

I kept running Heaven and observing my voltage on card 1 and going up on card 2's core clock in increments of 10 on card 2 until I fond a point where the voltages get super close. I then increase in 1mv increments until I found that sweet spot. In my case when I got to + 40 I had to go down because the voltages for card 2 started decreasing.

+35 on card 2 did it for me. Your delta may be different.

Same goes if I'm at +200 and +235. As long as there is that 35mhz delta the voltages stay very close and consistent..

I hope this explanation helps someone.
 
I found the offset required depending on the clock but made a table of values and experiment until everything synced up. For me it was +198 and +158.

Start off at stock and get them matched and work from there
 
I think I've sorted it without resorting to flashing the BIOS...

I have GDDR5 (Samsung) showing up in GPUZ for both cards. However I seem to not be having much luck with memory overclocking. What should the samsung memory be good for?

8000 should be reachable.

Anything higher is a bonus
 
Why is everyone so concerned about the memory hynix, samsung etc

does OCing the memory really make that much difference

are we talking an extra 10fps ?
 
What are the symptoms of pushing memory too far these days? Mine will run fine for about 45 minutes and then crash and that's regardless of whether memory is at +300 or +500. No visible artefacts though.

Got a new PSU on the way in case only having 700w is an issue
 
What are the symptoms of pushing memory too far these days? Mine will run fine for about 45 minutes and then crash and that's regardless of whether memory is at +300 or +500. No visible artefacts though.

Got a new PSU on the way in case only having 700w is an issue

mine get a black screen for a few seconds and the clocks revert back to stock
 
What are the symptoms of pushing memory too far these days? Mine will run fine for about 45 minutes and then crash and that's regardless of whether memory is at +300 or +500. No visible artefacts though.

Got a new PSU on the way in case only having 700w is an issue




Usually games will randomly crash after 30-40 mins for me too.I can bench my card at +500mhz for days on heaven/firestrike.But in actual gaming it seems to like random crashes,so i just run it at +400 in games.Thats on samsung memory at stock volts(extra volts dont seem to affect memory overclocks from my experience)
 
How do you tell which memory it has? GPU-Z tells me nothing.

That's weird. It used to say it in brackets in the memory type box. e.g GDDR5 (Samsung), but now it doesn't show.

Maybe it depends on the drivers you have installed. Or if your drivers are WHQL signed.

I remembered now, it is Nvidia Inspector that shows the memory vendor.

GPU-Z is supposed to show it though.
 
Most people will have Overclocked there 970s.

But out of interest for those who run at Stock 24/7 or even those who have Overclocked after running at Stock.

which Brand 970 do you have, and at Stock what Core Boost's were you guys receiving.

MSI 970 GTX - 1393 Core Boost at Stock

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Also what I don't understand is if my GTX boosts to 1393 at stock.. With an Overclock is also boosts OVER my Overclock so if it can boost higher after a slight Core increase it's obviously capable so why would it not just boost to what its capable of out of the box? :P (I understand I am overclocking it therefore higher core boost, but my point is let's say 1400 Mhz is the overclock why would it then boost OVER the set 1400mhz which is already faster than what it originally boosts at if this explains my point better)
 
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