Now, for Bitcoins I just add the flags "-v -w128 -f 60" and it works extremely fast even when I play BF3 and nothing shatters (If I play heavy graphics games it will go down to ~150Mha/s tops, and when I finish playing it jumps back to ~300Mah/s), the computer works flawlessly,
but for Litecoins whenever I use the flag "-I d" it goes down to 10% of it's power (from 325Kha/s to 30-20Kha/s) even when I just look at the computer!
Sounds like to me mining bitcoin achieves your goal. So the solution would be to mine bitcoin.
If your question is "how do I mine litecoin and play games at the same time?"
I have no idea.
By the way, 300 Mhs/s is not "extremely fast" with a 5850. That's a low average.
Sam
And my card is not OCed, can I raise the speed without OCing it, or is that the only way?