What is the difference between ZOPO ZP900 and ZOPO ZP900S?

As everybody knows,the ZOPO ZP900S is the lastest phone from ZOPO company,the ZOPO ZP900 was so hot the last few month,and now what is the difference between them?the ZOPO ZP900S is better?
I-Love-Electronic team will tell you guys now.

ZOPO ZP900 Details:
Network Mode: GSM, WCDMA
Screen: 5.3 inch,TFT Capacitive screen, Multi-touch,960x540
Camera: 8MP+2MP
Operating System: Android 4.0 OS
CPU: MTK6577 1GHz Dual Core
RAM: 1GB
ROM: 4GB
Battery: 2300mAh

ZOPO ZP900S Details:
Network Mode: GSM, WCDMA
Screen: 5.3 inch,TFT Capacitive screen, Multi-touch,960x540
Camera: 8MP+2MP
Operating System: Android 4.0 OS
CPU: MTK6577 1GHz Dual Core
RAM: 512MB
ROM: 4GB
Battery: 2300mAh

So they are just supports different RAM.
you clear now?