Android System Info
You can find the apk here in case you don't have Market on your device.
This tool allows you to identify the hardware inside your device.
The following was grabbed from my Rockchip RK2808a based Apad iRobot (http://hiapad.com for specs and how it looks like)
Main Screen - Note your RAM here
You can round the to nearest 64MB to get an idea of how much actual RAM you have
System Build Info - Note the Fingerprint, Display, and API Level Lines
Fingerprint and Display gives information about your current firmware
API level is your Android version (3 being Android 1.5 Cupcake here)
System CPU - Note the Processor, BogoMIPS, Hardware
Processor gives the CPU type and architecture you have
BogoMIPS gives a sense of how fast the CPU is running (in this case it is 600 MHz, but it displays 50% of that for ARM926 variants)
Hardware is your CPU's identifier
System Screen - Note screen resolution, also DPI if available