Wich card models? Wich operating system? I get 5-10% more hash on my rigs...
I've got 4200kh/s with djm's ccminer lyra and your release 60.
But only 3740 with your r68 and r69 (((
gtx 750 1gb 1500/1600
That is because the launch config is wrong for the 750. Check the lyra2REv2 file and adjust the TPB and the intensity.
else if (strstr(props.name, "750"))
{
intensity = 256 * 256 * 5;
tpb = 7;
}
TPB should be changed to something else. start with 1 recompile test, then 2, then 3 then....
256 * 256 * 5 is the same as -X 5
run with -X 1, -X 2, -X 3 etc.. until you find the optimal solution.
lyra2v2 is a semi memory algorithm. You need to find the optimal configuration for your card just like in scrypt mining.