Here is a good link to prevent downclocking. My 260 was going to 2D mode until I found this information.

http://www.overclock.net/nvidia/423880-howto-prevent-gtx-200-series-downclocking.html

Link to prevent Nvidia 2D Downclocking

I think the easy way is to set the 2D and low 3D clocks to the same as full speed using ATI tool.

Bob

it works for xp64 but for Widows 7 it wont let you do it any idea's to get work around for windows 7 to let you force the 3d to keep it from kicking down to 2d.
thanks.

This looks promising for Vista and above downclocking problem. Seems too easy..
Sorry, I've not quite figured out how to make a link clickable.


http://nvidia.custhelp.com/cgi-bin/nvidia.cfg/php/enduser/std_adp.php?p_faqid=2441

thanks i will give it a try im hoping to get my 260s to work together on the same
board so it free up my other board so i can run 3 gts 250 on that board if it works i will add 2 more gtx 260s later on when i get my new PSU in.

Marks link made clickable Nvidia 3D Settings for Vista and above


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Well this seems to be the casue of all my dead WUs unfortunatly these two options don't seem to be doing anything for me. (Booting with signed driver requirment turned off for RT) in Vista 64 with 190.38 on a pair of 280s

I *may* have a solution, (seems to be working after reverting to 186.06 for me) but it's a bit odd. Start FurMark (just the start-up window will do) this seems to initilise the OpenGL system (and the drivers pick it up and go into 3D performance mode) but looking at my GPU temps not put any load onto the GPU(s) untill you start the render process (I can't test it with WUs untill the next batch download in 9hrs as I've hit my quota with dead WUs).

GTX 280s now ideling at 646mhz and 55 and 53c. (I guess the hot one is on top).

Ok feeling a bit of an idiot, had SLI turned on (not much use for Boinc in 186.06 if you want both cards running) with it off it only workis for the primary GPU not both as the second one falls off to 300MHz again.

I was getting it in games when Boinc wasn't running and I think it probably is the cause of the problem, looking at the performance I get in benchmarks when it down clocked it was lower than I would have expected given just the differance in MHz. I don't know the G200 specs but I wounder if more happens when the chip poweres down than just a reduction in clock speed, if for example it's shutting down some of it's internal structure the way CPUs can (it would explain the very good thermal displacement and power use the cards have at idle and the problems with GPU Grid).

I knew I should never have swapped from Software Engineering to Mechanical Engineering. ;)

I'm having this same very annoying problem, cards go down to 400MHz and I can't get them running at full speed without reboot. After some while they are back to 2D clock.

Win7 x64, 2x GTX275, driver 190.38.

Even using EVGA Precision tool does not change clock higher... Driver power settings have no effect. Also starting game does not increase to 3d clock.