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I just bought the new 7870 LE Tahiti card, it will be my first time overclocking. Any tips? - Page 11

post #101 of 113
Quote:
Originally Posted by Spicy61 View Post

I'm running the PowerColor 7870 Myst. Very quick OC session yields the following settings (there's room for more but not gonna explore at the moment):

1185/1500
Power: +20%
Done with CCC

What about other Myst owners--what's your settings?



By the way guys.... any of you Myst owners having difficulty out of sleep? Takes mine a pretty long time for signal to come through after coming out of sleep.

I run my crossfired Mysts at 1200/1500 stable...The highest I was ever able to push a single card was 1253/1500 but it wasn't stable. The memory does NOT like to be overclocked, at least on my cards. Benchmark scores immediately go down if I touch the memory. I leave it at 1500..good enough. Temps are well under control with highest being 74C VRM on Dirt3 benchmark and 70C for the max core temp with 100% fan. I use MSI Afterburner for overclocking and suggest you use it. To run at 1200/1500 you will need at least 60% fan, possibly more depending on your case, etc. The card does get loud but I don't care: I put the sound up loud or use headphones. I'll suffer a bit for performance. Check your core and VRM temps using GPU-Z. All you have to do is experiment as every card is different. I got lucky and have 2 well-running cards. Peace...jimbo
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post #102 of 113
I am running mine at 1150/1500 crossfire and GPU usage is not consistent. It may be driver issue.
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post #103 of 113
Just got the PCS+ Myst HD 7870 today....

I've been pushing 1180core / 1500mem with no problems... +0 power limit. This card is really scary in terms of temperatures and noise though.
My ASIC quality is 76.7%, which is good I guess? thumb.gif
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post #104 of 113
Quote:
Originally Posted by Buska103 View Post

Just got the PCS+ Myst HD 7870 today....

I've been pushing 1180core / 1500mem with no problems... +0 power limit. This card is really scary in terms of temperatures and noise though.
My ASIC quality is 76.7%, which is good I guess? thumb.gif

VOLT?
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post #105 of 113
Quote:
Originally Posted by Bartouille View Post

VOLT?

I'm new to this power limiter crap since I'm coming from the older generation video cards.... heh.
GPU-Z says VDDC is 1.094v whereas Kombustor says 1.256v.
I don't know which to believe nerdsmiley.png
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post #106 of 113
Quote:
Originally Posted by Buska103 View Post

I'm new to this power limiter crap since I'm coming from the older generation video cards.... heh.
GPU-Z says VDDC is 1.094v whereas Kombustor says 1.256v.
I don't know which to believe nerdsmiley.png

Voltage of 1.256 seems to be the norm when overclocking. My LE voltage at idle
is around 950mv but when I OC it immediately jumps to 1256mv. Even though the latest MSI afterburner has a working voltage adjuster, it doesn't seem to work, at least for me.
Edited by jimbo02816 - 4/4/13 at 3:59pm
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post #107 of 113
Quote:
Originally Posted by Buska103 View Post

Just got the PCS+ Myst HD 7870 today....

I've been pushing 1180core / 1500mem with no problems... +0 power limit. This card is really scary in terms of temperatures and noise though.
My ASIC quality is 76.7%, which is good I guess? thumb.gif

You must put your power limit at 20%...you won't believe the increase in performance...ASIC quality is very good...my crossfired 7870 LE\s have a 67.6 ASIC quality...nice score for you...also, you must increase fan to at least 60% to OC to 1180 or 1200...I put it at 100% during benchmarks and extreme gaming. It's very loud but I use headphones or turn volume of game up loud. Monitor your temps using GPU-Z and log to file so you can see results. As long as your highest core temp and/or VRM temp stays below 90C, you good for short period of time. Stay around 80C and you can run 24/7. You won't get to that if you have decent cooling. My highest VRM extreme gaming is 74C, core 70C.
Edited by jimbo02816 - 4/4/13 at 2:53pm
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post #108 of 113
I probably have worst asics.. 58.0 asics quality frown.gif
My card will throttle without power limit frown.gif I oc'ed to 1150/1500.
I guess asics quality must be really mean something.
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post #109 of 113
Quote:
Originally Posted by krazyatom View Post

I probably have worst asics.. 58.0 asics quality frown.gif
My card will throttle without power limit frown.gif I oc'ed to 1150/1500.
I guess asics quality must be really mean something.

Chill my friend..I've been doing a bit of research and there is controversy concerning these scores. From what I have read, some people have ASIC scores under 60 and have a very stable overclock. If your card is OC fine with no stability problems, then you OK. Research it..some experts put very little faith in this score. By the way, I leave my PowerLimit at 20% when gaming or benchmarking, 0% when surfing net.
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post #110 of 113
Quote:
Originally Posted by jimbo02816 View Post

Chill my friend..I've been doing a bit of research and there is controversy concerning these scores. From what I have read, some people have ASIC scores under 60 and have a very stable overclock. If your card is OC fine with no stability problems, then you OK. Research it..some experts put very little faith in this score. By the way, I leave my PowerLimit at 20% when gaming or benchmarking, 0% when surfing net.

My default voltage is like 1188 in MSI ab. I guess it mean 1.188 voltage by default.
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