That is because the launch config is wrong for the 750. Check the lyra2v2 file and adjust the TPB and the intensity.
else if (strstr(props.name, "750"))
{
intensity = 256 * 256 * 5;
tpb = 7;
}
As far as I understand I can change intensity with - i parameter without recompile. But it doesn't help, I tried.
What is tpb? Can I change it without recompile?
Threads per block. You need to recompile for each time you change it, but a change of values will speedup alot. See my edited post above...
When you find the optimal values for your card, please post it and I will change it as the default setting..
The 750ti, and the 970 settings should be pretty good. (5-10% faster than DJM's version on the maxwell)
The other models probobly need a different launch config. I haven't done it yet because lyra2v2 hasn't been profitable.
And another thing....
My modded kernal is slower on linux and on older cards.
(compute 3.0/3.5 Might not work).