Wow - that's great! You still running Vista x64? On the bottlenecks - those counters are designed to be collected when performing experiments, which we are not doing. I think we should just exclude all of those counters for now. Can you provide the list of the 90 counters less the bottleneck listings? I'm interested to see what the GTX260 has versus my GTX280 which has 385 counters, not 90. Also, did you have the driver instrumentation running? That has to be run with admin rights, Nvidia puts a shortcut in the Start->Programs->StartUp folder, so you can delete that and either run it manually or via an elevated scheduled task (all this assuming the UAC is enabled of course).