Just look at all that shelving - it is endless.
I can count at least 10 aisles, probably 15. They accommodate modules on both sides.
Each shelving unit seems to be: 7 floors high, 20 sections long and each section accommodates 6 modules.
So 15 units/aisles x 7 floors x 20 sections x 2 sides x 6 modules = 25,200 modules
25,200 x 167.5GH/s = 4,221,000GH/s = 4,221TH/s = 4.2PH/s

4.2PH/s = 1400 Neptunes @ 3TH/s