is it that profitable ?
now if you want the ultimate scrypt-jane high factor experience... install linux, it is well known the hashrate is much higher on linuex
That's mostly because the video memory usage is limited to 88% on windows by default:
#if WIN32
device_backoff[thr_id] = 12;
#else
device_backoff[thr_id] = 2;
#endif
Which is only necessary if you're mining on your primary card.