The differences between Rock64 and RockPro64

[phamoanh]

Hi Everyone,
I am new to Single Board Computers and Arm Architecture. I have been using GNU/Linux on my X86 as my main desktop Pc for a few years. This is my current configuration of my pc: Distro: Release Linux Mint 17.2 Rafaela 64-bit - Kernel Linux 3.16.0-38-generic x86_64 - Desktop Manager : MATE 1.10.2 - Hardware: Memory: 8:00 Gb - Processor: Intel® Core™2 Quad CPU Q6600 @ 2.40GHz × 4 This pc is connected to the cheap display via HDMI (A 40 in Westinghouse led TV) With these configurations I have everything I need for work, play and fun.
I would appreciated very much if anyone can help me with these ?:-)
What is the differences between the Rock64 vs RockPro64 ?
Is there any option for booting to the system with different OS like Grub loader?
Is the 1 Gb of Ram + add on Dac be good for Volumio?
Thanking in advance an Rock On:-)
Cheers,
Phamo

[evilbunny]

What is the differences between the Rock64 vs RockPro64 ?

The r64 has a quad core chip
The rp64 has 6 cores, 2 big and 4 little cores, the 4 little cores are clocked higher than the r64, and all up is about 3 times quicker