I also purchased this MXQ Pro 4K 5G TV box but I'm not sure if it's rk3128 or rk322x, how do I know for sure?
the host name print rk322x but cpuinfo print rk3128:
rk322x_box:/ # getprop ro.hardware ro.hardware.chipname
rk30board
rk322x_box:/ # cat /proc/cpuinfo
Processor : ARMv7 Processor rev 5 (v7l)
processor : 0
model name : ARMv7 Processor rev 5 (v7l)
BogoMIPS : 48.00
Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 evtstrm
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xc07
CPU revision : 5
processor : 1
model name : ARMv7 Processor rev 5 (v7l)
BogoMIPS : 48.00
Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 evtstrm
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xc07
CPU revision : 5
processor : 2
model name : ARMv7 Processor rev 5 (v7l)
BogoMIPS : 48.00
Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 evtstrm
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xc07
CPU revision : 5
processor : 3
model name : ARMv7 Processor rev 5 (v7l)
BogoMIPS : 48.00
Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 evtstrm
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xc07
CPU revision : 5
Hardware : Rockchip RK3128
Revision : 0000
Serial : b57642ed91a64924