Espresif ESP8266 vs ESP32 vs Ameba RTL8195 vs Ameba RTL8710

Link	Espressif ESP32	Espressif ESP8266	Ameba RTL8195	Ameba RTL8710
Release date	2016	2014	Jul. 1^st 2016	Aug. 1^st 2016
Product details
RAM	520 KB	50 KB less than		48 KB available to user
CPU	Tensilica Xtensa LX6 32 bit Dual-Core @ 160 / 240Mhz	Tensilica LX106 32 bit @ 80 MHz (up to 160 MHz)	ARM Cortex M3 32 bit @ 166 MHz	ARM Cortex M3 32 bit @ 83 MHz
Flash	up to 64 MBytes	1, 2, 4, 8 or 16 MB		1MB Built-in
Input Voltage	2.2 V - 3.6 V	3.0 V - 3.6 V	3.0 V - 3.6 V	3.0 V - 3.6 V
Operating Current	80 mA average	80 mA average	80 mA average	80 mA average
Temperature Range	-40°C to 125°C	-40°C to 125°C	-40°C to +125°C	-40°C to +125°C
Standards	FCC/CE/TELEC/KCC	FCC/CE/TELEC/SRRC	FCC/CE/TELEC/SRRC	FCC/CE/TELEC/SRRC
Connectivity
Wi-Fi	Yes 802.11b/g/n	Yes 802.11b/g/n (max 65Mbps)	Yes 802.11b/g/n	Yes 802.11b/g/n
Bluetooth®	Yes 4.2 BR/EDR + BLE	No	No	No
UART	3	2	3x UART	2x UART
I/O
I²C	Yes up to 2	Yes up to 1	Yes up to 4	Yes up to 1
GPIO	34	17 (up to)	30 (up to)	17 (up to)
PCM	Yes up to 1	No	Yes up to 2	No
PWM	Yes up to 8	Yes 4	Yes up to 4	Yes up to 4
ADC	Yes 12 bit SAR ADC up to 18 channels	Yes 10 bit	Yes 2 channels	No
DAC	Yes 8 bit up to 2 channels	No	Yes 1 channel	No
Dimensions
Package	QFN-48	QFN-32	QFN-48	QFN-48
Height	6 mm	5 mm	6 mm	6 mm
Width	6 mm	5 mm	6 mm	6 mm
Links
Website	espressif.com/...	espressif.com/...	amebaiot.com/en/	amebaiot.com/en/
Wikipedia	wikipedia.org/...	wikipedia.org/...
See on Amazon	amazon.com/...	amazon.com/...	amazon.com/...