System Information
Operating system: Linux Mint 19 Tara
Graphics card: Nvidia GeForce GT 630
Blender Version
Broken:
2.80 (sub 35), branch: blender2.8, commit date: 2018-12-01 23:15, hash: 8c620c8e2b3, type: Release
Worked: 2.79b
Short description of error
Particle node doesn't give proper output to drive the color ramp.
Exact steps for others to reproduce the error
This is how it should look
and this is 2.8:

