I would think you would want to use 6 threads which should each get about 3 khash each for a total of about 20 khash. Are you rrunning 64 bit? B/c the new minerd that pooler just released is what I'm getting my rates from.
Yeah I'm running the new minerd that Pooler posted, but I'm only getting around 7.4 KH/s (I just copied the contents of the Windows binary into my Litecoin directory). But I'm not really running any parameters or anything. All i'm doing is running the litecoin-qt.exe (or whatever its called) and pressing the "Mine" button. Do I have to set up any config files or anything like that?
I think I mentioned this in another thread, but for completeness:
I'm running .bat file that I got from someone. When I put it in the same director as the three files from pooler's miner, then I have to put in 4 settings:
1) the pool website I'm mining with (I mine with a pool, cuz I haven't conquered my fear of solo mining yet)
2) the miner username & password
3) hit enter, I don't even know what the 3rd setting really does
4) enter the number of threads.
I currently use 2 on my duo core intel and get 3.5 khash/s per core for my laptop using the 32 bit miner.
And I use 2 threads on my mining desktop which has an AMD Phenom quad core. I only use 2 threads on 2 cores, b/c I like to keep 1 core dedicated to each GPU and my desktop has a Radeon 5970, so 2 GPU's.
I have a mining rig with two 5970's in it right now and a quad core processor, and I don't mess with CPU mining on that just yet. It's actually my friend's borrowed rig, which is why I leave the CPU chains for my desktop and my laptop.
I have heard that the 1 core per GPU may not be necessary if "updated" drivers and such are used, but I haven't had time to fully look into this.
Hope this helps! Let me know if you have any other questions.