I have an S3 with a 4-core CPU and 1GB RAM and a Note 10.1 with 4-core CPU and 2GB RAM. The difference in performance is very noticable and at this point RAM is the only thing I really need upgraded in my phone. The screen res, etc. is just gimmicks.
OT MaxDB, CD1, CD5, J5, GD96, ME45, T68i, X6, CX65, A925, E398, MPx200, X6-2, OT715, D600E, W810, M600i, BB8100, W880, N95-2, P1i, Ignito, W880, X1, MS1, MS2, TP851, XT910, GTab 10.1, SGS3, SGS4, SGNote 10.1, Nexus 7 II