I dont think it is 8 rack per DC, it is 4 rack per DC.
>We currently spend about $60,000/month on eight dedicated racks between our two data centers
And they are only doing 64 Core. We will have 256 Zen 6 core next year. And it seems by next year, if they were willing to pay for density they could have fitted everything inside one rack per DC.
Exciting times.
Edit: Actually if Intel were to push 18A on server it would make performance / density even better.
The whole business that used to be 1/5 of the size 10 years ago were running on 100s of racks. And today it could be less than 10.