Intel i7 4770k @ 3.5GHz
Windows 10 Home (1607) 64-bit
ASIO Hammerfall DSP, 1024 samples, 44.1kHz
Tracks: 80 2-ch. audio tracks, all files 96kHz stereo WAV so they were resampled in project.
Plugins: 240 instances (ReaEQ, ReaComp and ReaFir on every track), no anticipative FX processing.
Other notes: All tracks straight to master. All pics taken after 1 minute of playback. Playback was just about on threshold of clean with both Win32 versions, Win64 versions were cleaner.
edit:better test run