The setup is as follows
8gb ram
Gigabyte z68ap-d3 MB
Intel i5 3570k
1000w seasonic platinum
gigabyte 280x
Zotac gtx 680 4GB
Cudaminer settings for scrypt:
-H 1 -C 1 -d 0 -i 0 -m 1 -l K8x32
results in 330 kh/s, not affected if the 280 is mining. On its own the 280 gives 720 kh/s, with cudaminer on around 620-650. I think I should be able to run it with full hashrate somehow?
I can provide some hardware readings too if necessary. Only thing unusual I notice with both running is the pagefile usage goes up to 8000+ compared to 6500 with just one miner on.
H and C flags are cpu hogs if you set them to 1.
AFter some testing, combination of H2 C1 seems to be best - full hashrate on 280x and just -10 for GTX 680.
Cheers peeps!