very cool. I did something similar today while overclocking my 4850 using F@H to benchmark.
I used RivaTuner for setting my overclock, also maxing the fan-speed at 100% ,and used GPU-Z to monitor temperatures.
folded for approximately 10 minutes at every tier and recorded the best result. times were always within a second threshold of each-other. When I reached 745MHz I decided to fold for 45 minutes while I went for a shower
here are my results
(I couldn't paste the chart in so here's a picture)
I had the same experience where a memory speed increase yielded unseen results so focused on the core clocks instead. I started recording Core temperature after 700MHz . The hottest the shader core got was 75C @700MHz core, and 78C @ 745MHz core.
120 MHz gain shaved 20s off a 1% WU , 33m 20s off a full WU.
19% overclock with a 16% time reduction very nice
first holdup was at 760MHz. temps seemed to be alright but the F@H client refused to fold receiving a Unstable Machine, Core Shutdown message in the prompt.
and another holdup at 750MHz, immediately the GPU crashed, windows recovered but unfortunately left me with a blank screen and had to manual reboot. I received the same types of crashes when determining gaming stability. crash would start with 1 beep followed by 5 seconds of audio and video freeze. afterward video signal is lost to the screen while all audio and peripherals would recover and continue normally.
and that concludes today's overclocking experience