My initial test went fine in terms of stability, but the 650's performance was about half of the 560 Ti. I was expecting the two to be more similar, largely due to having the same number of shaders. But since the 650 is my first exposure to Kepler, I just want a sanity check of what I'm seeing. When looking around for clues, I saw that the 650 might have been throttling during folding. I've heard the Keplers can do this, but I got mixed information from the EVGA "NV-Z" monitoring tool. Here's the 650 when idle; notice the Current and Max GPU core clocks in the P8 & P0 states. And as expected, the Current PState's GPU clock matches the "GPU clock" value below:
However, while folding, look what happens not only to the Max GPU clock, but that the Current PState's GPU clock doesn't match the GPU clock shown below:
So this leads me to think 1 of 3 things is happening:
1) The GPU is throttling, but if so, why the apparent discrepancies in the reported current core clock?
2) The NV-Z tool and/or GeForce driver are reporting incorrect clock data;
3) Both 1) & 2) are happening.
Environment: WinXP SP3 32-bit, GeForce 314.07 driver, FAHclient 7.3.6.
Thanks for any insight into this behavior.