Your GPU has Hynix VRAM, with loose memory timings. At most OC, it would barely push 19 MH/s. With Hynix memory, look for core-intensive algos (Equihash, NeoScrypt, Lyra2REv2, etc). You'll get 10-15% higher hashrate on these algos vs a 3GB GPU (6GB cards have more CUDA cores).