See in India, you get 1333mhz cl9 latency which are cheap (and nothing special/worth for their money), 1333mhz clz and 1600 mhz cl9. So far the 1600mhz that you get are not native 1600mhz. They by default run at 1333mhz cl8, but you can clock them using 1333mhz cl6-7 or 1600 mhz default timings on stock vDRAM. If you can spend 7k approx on 1333mhz cl7 4GB, well and good.
You get triple channel and dual channel. IIRC, p55 does support 1600mhz+, but it also depends on the board that you're taking.
Yup, the peformance difference especially in gaming is nil....except DDr3 1600 consumes 30W more power..
@KaranTh85:
When is the mahurath to buy your system. Its been a while. Get it..please....! Soon you will be asking PCB color. !!!!