8800gt 2d clock speed

[chrcoluk]

My 7600gt downclocked in desktop mode and as such used less power and ran cooler, my new zotac 8800gt runs at full clocks in desktop mode. At first I thought the temps were crazy, but I loaded a game and some 3d benchmarks and 3d temp is only 2 degrees higher than desktop temp and the clock speeds stay the same.

If I downclock the desktop/2d clocks does anyone have reasonable values I can set?

thanks

 

[JimmiG]

My Gigabyte 8800GT ran at 700 MHz in 3D mode and 450MHz in 2D mode, memory 920 MHz 3D and 700 MHz 2D.. You can probably go much lower, though.. Something like 150 MHz is probably more than enough.

 

[Nenu]

On most (if not all ??) 8800GT cards, 2D and 3D clocks are tied, there are no separate clocks.
I tested the system power consumed running my 8800GT card idle at stock speeds and underclocked as far as they will go and the max difference was 2 to 3W only (at the wall).
So it looks like there is no real need for separate 2D / 3D clocks on the 8800GT at least.

JimmiG's results baffle me as I havent seen an 8800GT that has separate 2D / 3D clocks.
Can anyone else confirm?

 

[Porter_]

JimmiG's results baffle me as I havent seen an 8800GT that has separate 2D / 3D clocks.
Can anyone else confirm?

baffled as well, nvidia cards don't have independent 2D/3D clocks.

 

[chrcoluk]

Hi, nvidia have had seperate 2d/3d clocks for a while, rivatuner has a section for tuning it, and it was possible to set them on the old style nvidia control panel as well.

From what I have researched on the 8800gt it is just defaulting to tied clocks but it can be reconfigured either in the bios or in software like rivatuner. Like how the fan speeds can be configured as well.

Both my 6600gt which was years back and 7600gt defaulted to seperate 2d/3d clocks.

 

[Nenu]

Hi, nvidia have had seperate 2d/3d clocks for a while, rivatuner has a section for tuning it, and it was possible to set them on the old style nvidia control panel as well.

From what I have researched on the 8800gt it is just defaulting to tied clocks but it can be reconfigured either in the bios or in software like rivatuner. Like how the fan speeds can be configured as well.

Both my 6600gt which was years back and 7600gt defaulted to seperate 2d/3d clocks.

Rivatuner has sections for it due to previous card generations that did support separate clocks.
The newer cards BIOS does not use this information though.

Try it on a newer card, no matter what you do, the clocks will not change when going from 2D to 3D mode and back.

 

[Porter_]

Try it on a newer card, no matter what you do, the clocks will not change when going from 2D to 3D mode and back.

yep, that's how it was with my 8800GTS and also my 8800GT.

 

[Seb1]

JimmiG's results baffle me as I havent seen an 8800GT that has separate 2D / 3D clocks.
Can anyone else confirm?

I've seen a few reports from users with the non-standard PCB Gigabyte 8800GT's having separate 2D/3D clocks. In addition the 1 GB Gainward 8800GT has separate speeds too.
Something from Gigabyte

In addition, GIGABYTE’s Gamer HUD™ provides advanced power savings through its auto-optimized 2D/3D GPU frequency switching feature.

Another test from Bjorn3d says that

We can attest that in our testing we experienced around a 15 Watt decrease in power consumption even without invoking any of the power saving optimization features GIGABYTE offers on this card.

IMO the TurboForce Gigabyte cards have separate 2D/3D clocks in the BIOS... for more proof I must head over mvktech.

I found something, the above mentioned card has the VGO chip (Voltage Gear Overdrive), "... the GeForce 8800 GT will lower the clock automatically for 2D operation without the 2D mode being set." - what Mavke said.

 

[Nenu]

Cool, thanks for the info.

 

[JimmiG]

Yeah, the Gigabyte 8800GT "TurboForce" card is probably quite unique in that it features lower clocks and GPU voltage in 2D mode. Kind of ironic since it's also one of the few (if not the only) 8800GT cards that doesn't feature variable fan speeds so even with the lower voltage and clocks, it's much louder than a regular 8800GT @ idle

 

[chrcoluk]

thanks guys, I will probably not mess with it in rivatuner then.

New question tho.

Since we established that the reference 8800gt doesnt split the 2d/3d clocks how are review sites seeing lower voltage/temps in 2d mode?

 

[Nenu]

thanks guys, I will probably not mess with it in rivatuner then.

New question tho.

Since we established that the reference 8800gt doesnt split the 2d/3d clocks how are review sites seeing lower voltage/temps in 2d mode?

In 3D mode, the voltage is boosted.
Also in 2D mode, there is very little GPU use so temps will drop due to that and the lower voltage.

 

[chrcoluk]

It seems this problem is known that 8800gt's do this on asus p5wdh deluxe boards which I have. No known fix but I guess some kind of incompatability.

my temps and voltages/speeds are the same on 2d and 3d with this card.