We're currently aware of some disparity issues between GPU and CPU rendering modes with Particular.

The major cases this disparity has been found are when:

• Working with Shadowlets in 32bpc comps, in which case switching to 16bpc resolves the issue.
• Shadowlets on particles with blend mode set to Add, Normal Add over Life or Normal Screen over Life may show a disparity between CPU and GPU Direct. The difference becomes less apparent when working with 16 bpc and 32bpc.
• Star particles with a small particle size (4 or below) may not be as crisp in GPU Streaming. To workaround this, work in CPU or GPU Direct modes.