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[Official] 7870 Tahiti LE (XT) Owners Club - Page 35

post #341 of 5247
it may be that there's MORE than 1 thing that can "downclock" itself

So, say you lock section 1.. but section 2 which may be required "under certain circumstances" would downclock, because section 1 is pushing the card to hard...

So, now say you "unlock" section 1, then a "specific" bench which requires section 2 more than 1, would benefit, because section 2 would now be clocked higher, because section 1 which isn't required as much will be Lower, freeing up "something" for section 2..


Yea, i'm just making stuff up here... but that would explain it. biggrin.gif
post #342 of 5247
Quote:
Originally Posted by krazyatom View Post

@mikemike86

Thanks, I'll try that when I get back home.
If I look at my GPU-Z using crossfire, I see VRM1/2 senor from only one of my card.
So strange that choppy GPU usage still gives you good benchmark scores. It's very irritating frown.gif

I read recently, can't remember where, that Powerplay is regulating VRM current to keep the pcb cooler and manage heat/load on the gpu. Many posters have said it is just keeping the electric bill down, but I now believe it is optimizing card performance.
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post #343 of 5247
Quote:
Originally Posted by tp4tissue View Post

Hey guys.. I just bought a powercolor myst off the slickdeals for my mother's computer downstairs.

Couple of questions

1. Which Driver + Bios combination are you guys using for overclocking.. 0.28 or 0.30 or the hard to find 0.32 with... catalyst 13.x ?

2. Does disabling the powerplay via msi-afterburner mean it will "NEVER" downclock to idle power state ?? So I'd have to manually adjust when I'm just watching the videos?thumb.gif


3. I've heard the myst is voltage locked... is this true? IF NOT, what's the max voltage on these chips for 2 years operation. that's all I need 2 years.


I'd like to know this as well.


I have been reading these threads and this card seems to be very unstable.


This card may be made on defective Tahiti GPUS that were in trash bin because they were unfit for HD79XX cards.
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post #344 of 5247
Quote:
Originally Posted by SonDa5 View Post

I'd like to know this as well.


I have been reading these threads and this card seems to be very unstable.


This card may be made on defective Tahiti GPUS that were in trash bin because they were unfit for HD79XX cards.

My Myst came with the 28 bios. A poster here suggested the 30 bios which I then researched. This bios is found in TechpowerUp and is for the Sapphire 7870 XT. I downloaded and flashed it to my Myst card.

I found that I could overclock higher, moving from 1150 to 1210. I also subjectively thought my performance was more stable.

The issue of instability comes from the view that AMD's Powerplay actively manages GPU clock and voltage. Hence, you see fluctuations in sensors, like GPUZ, when benchmarking or playing games. This was very alarming at first to me. However, after playing Crysis 3 for hours and benchmarking with Heaven, my observation is that Powerplay actually gives you better more stable fps. I do think the verdict is still out on this conclusion but the card is being managed in the way AMD intended - if you do not like this approach, you can turnoff Powerplay in Afterburner but could suffer lower fps and stability.

The fan noise is manageable via AB custom fan profiles. I do think the Sapphire two-fan approach is superior to Myst. Regardless, I just ordered watercooling equipment to eliminate this problem. When I am installed I will share the details, photos, and performance with members.

EDIT: As a part of research on watercooling this card, it appears that it may have fewer VRMs. This may be one reason in runs hotter plus the fact it is lower binned. I do NOT think it was ever retrieved from the trash bin, just not worthy of the same number of shaders as the 7950.

Compared to my 7850, the Crysis 3 sets, on the same settings, just look more authentic and frightening. FPS is better of course but there is a realism that is hard to put in words. This card really, really rocks!
Edited by Bluesman - 4/2/13 at 11:40am
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post #345 of 5247
@Bluesman

Mine came with .28 bios too. Should I also flash to .30?
I was also OC'ed to 1150mhz using stock and it would crash 1200mhz.
Can you screenshot your MSI Ab set up please and GPU-Z bios.
If I have to choose between stability and performance, I would go with stability. If these CF set up don't work out, I may have to send it back.

EDIT: I might keep one card if CF doesn't work well.
Edited by krazyatom - 4/2/13 at 11:45am
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post #346 of 5247
Is there an aftermarket air cooler that is compatible with Tahiti LE since it's a hybrid (sort of)? The board is 7950 (I think).
post #347 of 5247
Quote:
Originally Posted by krazyatom View Post

@Bluesman

Mine came with .28 bios too. Should I also flash to .30?
I was also OC'ed to 1150mhz using stock and it would crash 1200mhz.
Can you screenshot your MSI Ab set up please and GPU-Z bios.
If I have to choose between stability and performance, I would go with stability. If these CF set up don't work out, I may have to send it back.

EDIT: I might keep one card if CF doesn't work well.

Here you go:


Afterburner Settings:


And as a Bonus, my fan profile:
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post #348 of 5247
cool beans... thanks for the screen shots

So, the Voltage issue.. so it's locked correct?
post #349 of 5247
Quote:
Originally Posted by krazyatom View Post

@mikemike86

Thanks, I'll try that when I get back home.
If I look at my GPU-Z using crossfire, I see VRM1/2 senor from only one of my card.
So strange that choppy GPU usage still gives you good benchmark scores. It's very irritating frown.gif

I think most of the people with high clocks on air only run a single card, and I know I can run 1200 until that top card hits 75-80c. Might need water cooling for crossfire without having much voltage control.

The hotter electronics get, the more power they use. That's why people on water always overclock better.
Quote:
Originally Posted by tp4tissue View Post

cool beans... thanks for the screen shots

So, the Voltage issue.. so it's locked correct?
For the most part it is, if I force constant voltage I can change it from around 1.081v to 1.222v or so.

Without forcing, as the cards get hotter the voltage seems to go up by itself. At full load it starts at 1.182v and I've seen it get as high as 1.256v.
Edited by MikeMike86 - 4/2/13 at 12:48pm
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post #350 of 5247
LOL well obviously you wouldn't go water on 2 7870s because that would completely kill the performance per dollar..
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