What is the best setting for core 2 duo t9900? 
Current setting
-o stratum+tcp://aeon.pool.minergate.com:45690 -u mail -p pass -t 2
20-26H/s
core = 2
clock = 3.06GHz
overclock = none
L1cache = 128KB
L2cache = 6MB
L3cache = none
memory = 8GB(DDR2)
You need something with N-A1 support so AVX/ AVX2. what your getting with that CPU I can get with any quad core AM1 CPU.Current setting
-o stratum+tcp://aeon.pool.minergate.com:45690 -u mail -p pass -t 2
20-26H/s
core = 2
clock = 3.06GHz
overclock = none
L1cache = 128KB
L2cache = 6MB
L3cache = none
memory = 8GB(DDR2)