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7950 memory speed

benj0145

benj0145

benj0145

Associate
Joined
1 May 2012
Posts
104
Hi guys,

I've got my vapor-x 7950 running stable at 1100/1500, allbeit hot :/ Airflow in my case is decidedly weak, so need to do something about that.

The VRM temps are farsical on this card, I've had it running over 100 degrees on some games. Apparently the vapor-x suffers badly with poor vram cooling.

Anyway - even on the desktop from initial boot my 2d clocks are 500/1500. The memory speed never drops like it should based on ULPS. (I haven't disabled ULPS that i'm aware of!)

Does anyone know why my memory speed would be stuck at 3d?

eg:
467.png




Thanks
 
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ULPS, if I'm not wrong, is only for crossfire, it will turn off the cards that are not the primary one.

If you are running more than one monitor or 144hz monitor the memory will stay at it's max clock, I don't remember on top of my head but I think the core clock should drop to 300mhz as well.
 
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Drangueos said:
ULPS, if I'm not wrong, is only for crossfire, it will turn off the cards that are not the primary one.
Click to expand...

ULPS = Ultra Low Power State - That triggers the card into low clocks and voltage 300/150 clock speeds and 0.8v voltage. I think you're thinking of Zero core which is indeed a crossfire only feature. I think if you disable ULPS though you lose Zero Core. Maybe someone with an xfire setup can confirm that.
 
I also see that your VDDC current is 77A, my card on Idle uses something like 10 to 15 and I am using 3 monitors... when I get home I will check if the core clock is 500 or 300.

I think will be 300 with ULPS and 500 without.
 
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LtMatt said:
ULPS = Ultra Low Power State - That triggers the card into low clocks and voltage 300/150 clock speeds and 0.8v voltage. I think you're thinking of Zero core which is indeed a crossfire only feature. I think if you disable ULPS though you lose Zero Core. Maybe someone with an xfire setup can confirm that.
Click to expand...

oh yes.. you are right
for 2 or more cards if you disable ULPS you lose zero core.
 
@OP, have you ticked 'force constant voltage' through an oc program?

Desktop gadgets/widgets/Firefox/Chrome/java programs can all force 3D clocks too along with dual monitors or more and the 144Hz as explained above.

LtMatt said:
ULPS = Ultra Low Power State - That triggers the card into low clocks and voltage 300/150 clock speeds and 0.8v voltage. I think you're thinking of Zero core which is indeed a crossfire only feature. I think if you disable ULPS though you lose Zero Core. Maybe someone with an xfire setup can confirm that.
Click to expand...

Zero core is disabled with ulps in CrossFire= 2(or more) cards running on idle clocks rather than the second card shutting down completely.

I thought zerocore puts a single card into an almost off state if your monitor goes into sleep/standby as well?
 
tommybhoy said:
Zero core is disabled with ulps in CrossFire= 2(or more) cards running on idle clocks rather than the second card shutting down completely.

I thought zerocore puts a single card into an almost off state if your monitor goes into sleep/standby as well?
Click to expand...

I see so you have to disable ULPS to get Zero Core to work and to make the second card turn off at idle?
 
Check this out Tommy! Figured it out myself.

http://www.youtube.com/watch?v=a4NrqIXJ-kU

Zero core works on any AMD 7xxx series GPU. As soon as you monitor goes into standby it turns off most of the gpu and uses less than 3 watts electricity. That's neat.

To clarify, for zero core to work you need to have your monitor go into sleep mode. So if you leave a screensaver running all day it won't trigger zero core. I don't use a screen saver (disabled) and my monitor powers off after 10 minutes idle.
 
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I've found with my 7950 if i overclock the memory the core voltage will stay at maximum voltage even when the core clocks drop to idle, but even with that 77A VDDC Current is very high.

Here is mine(running multiple screens, hence the high idle clocks)
7z3.png
 
NightSt@lk3r said:
Is there a way to force custom 2d clocks? would love to be able to lower them to something sensible when using multiple screens.
Click to expand...

You can try it in afterburner but if you run more than one monitor then the clocks will always be higher to support both screens. Even though that means the memory runs at full speed the power usage barely increases at all according to thracks.

Thracks said:
To avoid display corruption in all scenarios, the only one-size-fits-all fix is to run the VRAM at max clock. Luckily this represents an extremely small percentage of overall graphics card power consumption.
Click to expand...
 
Hey guys, sorry for slow reply - yes i am using 2 monitors but neither is running at 144hz, or 120 for that matter. Both are a mere 60hz :P

oh and this has been a constant thing since the 12.xx catalysts. I am on the latest 13.5 beta 2 at the mo.

Is the 2 monitors likely to cause this?

thanks for all the input so far by the way :)
 
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As can be seen your v-core is high for a multi monitor idle clock. How are you overclocking and can you reset the overclock back to factory stock just to check idle voltage? Or try 1 monitor just to see if its drpping to 0.8v
 
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