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post #841 of 5048
I have heard from serveral people but unless you have aftermarket cooler or WC do not try above 1.3V. Anything more than about 1.285 gets dangerous but it's still okay if you have nice temps or are just benching.

Also I'm disappointed because I'm getting 2 5770's on Wednesday but I can't CF them until I get a new power supply.
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post #842 of 5048
Oh right. So my card's a good clocker actually, 1000/1200 at 1.12 looking round, I'm seeing comparable overclocks at 1.2V.

How do you overvolt further? Temps are in check, 65 load at 40 fan, can be turned up. ATT stops at 1.125.
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post #843 of 5048
Wow 1.12 is insane. How stable is it?

I don't know ATT but use MSI afterburner or the Asus voltage tweak tool
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post #844 of 5048
It passed about 10 mins in ATT's artifact test before I stopped it. But it's time to test it in the real world. And since the only game I have installed on this rig atm is Mirrors Edge, it'll have to do
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post #845 of 5048
Quote:
Originally Posted by T D View Post
It passed about 10 mins in ATT's artifact test before I stopped it. But it's time to test it in the real world. And since the only game I have installed on this rig atm is Mirrors Edge, it'll have to do
It's not stable. Remmember that these cards will not show artifacts, but performance is less when unstable, here is an example.

IN Crysis Very High Setings 1080p no aa; I get:

Stock: 19.5fps
1000/1400 1.22v 20fps
1000/1400 1.25v 21.4fps
1000/1400 1.26v 23.4fps ---->Stable with minimal voltage
1000/1400 1.35v 23.4fps

^ I hope that is self explanatory, but performance will increase with extra voltage if not stable. I say you have a nice overclock, but I can get mine to that settings and also run 10min of ATI artifact check and it would pass (as 5xxx series does not show artifacts), but would not be stable.

Run Crysis Very High on 3 loops at those settings.
Then increase voltage and run again, compare fps and find sweet spot.

Hope that makes sense and enjoy your new card!
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post #846 of 5048
Any thoughts how much voltage I would need for 950/1350 on two Sapphire V2 5770s?
In MSI Afterburner, the default core voltage is 1125 it looks like.
How can you tell if it's stable or not?
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post #847 of 5048
Quote:
Originally Posted by Seraphic View Post
Any thoughts how much voltage I would need for 950/1350 on two Sapphire V2 5770s?
In MSI Afterburner, the default core voltage is 1125 it looks like.
How can you tell if it's stable or not?
Read my above post to tell whether it is stable or not. I say start with 1.2v and use my above method to find optimal stability!
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post #848 of 5048
I ran about 20 mins of rthdribl, the fps dropped to 10 and VPU recover kicked in. So now I need to somehow get it above 1.2V <.<
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post #849 of 5048
Sign me up! Just put my batmobile in yesterday! Overclocking at the moment, can voltage be increased via software for these cards or is it all hard-modding that you guys are doing?

Whats a good overclock to aim for without any voltage increase?
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post #850 of 5048
ATT stops at 1.125V but I can go up to 1.35V with MSI Afterburner which is way more than I'll be needing.
Bob
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