Thanks for the comments.
I understand the AMD cards are going to perform much better than the nVidia card - that's what I added them
. But since the 460 is already in my system I'd like to put it to use anyway.
I tried using both the poclbm and phatk kernels but cgminer still only sees the two AMD cards. Even if I just tell cgminer to list the cards and exit it only reports two cards:C:\BitCoin\cgminer-1.6.2-win32>cgminer -ndevs
2 GPU devices detected
Any other suggestions for how I might get cgminer to use my 460 card are appreciated.
What happens if you run cgminer with the 2x5770s working normally and then run in another window a 2nd "cgminer -ndevs" after the first is running?
Just a guess, but that's basically what TeaL was saying and I'm wondering if it can't get at the 2x5770s if it will then see the 460?
(no idea just a suggestion to try)