I have reported this bug in a post here a few months back, today I upgraded to driver 181.20 and the bug still exists.
Using Vista64 and Tesla D870.
Description: Installing the driver, the two units of C870 inside the D870 are not being recognized as CUDA capable.
Patch: When I go into the NVIDIA control panel and I enable Physx for the Tesla D870 then and only then I get a situation where one C870 is being recognized as CUDA capable and the other one is not. Using gpuZ I see that one C870 is ok and the other one has been underclocked by 50%. :wacko:
This bug only occurs in Vista64 and does not occur under XP (I have a dual boot).
The problem seems to only affect the Tesla and not the GeForce 8600GT that is also installed.
This bug has existed in previous drivers and is still there.
EDIT: My previous post on the matter with screenshots that look exactly the same today with the new drivers as well: