Originally Posted by animal007uk
Its up and down but avg is around 1 min since setting cpu work time to 50%, Before i changed it, work units took 2 mins to 2 mins 30 secs.
GPU is at 1000mhz core and my core I5 2550k is at 4200MHz
Have you checked the actual elapsed time with a stopwatch? I remember reading somewhere about this, and it may be to do with the way BOINC captures the elapsed time not being real-world accurate if the CPU use setting is below 100%.
If it is working, then that's going to be an awesome boost. But the simple stop-watch test is probably worth doing. After all, it doesn't make sense that using less CPU power makes the task faster.