I believe it's two relatively simple servers running the Arc code of HN, and Cloudflare as CDN.
HN does not need much processing power or bandwidth - 5 assets (cacheable+versioned CSS/JS, three tiny gifs) and thanks to gzip usually two-digit KB sizes of content. The only real expense is the manpower needed for moderation.
I believe it's two relatively simple servers running the Arc code of HN, and Cloudflare as CDN.
HN does not need much processing power or bandwidth - 5 assets (cacheable+versioned CSS/JS, three tiny gifs) and thanks to gzip usually two-digit KB sizes of content. The only real expense is the manpower needed for moderation.