NZXT has a long history of making high quality cases and power supplies. While Razer is probably best known for their mice, headphones, and keyboards. As with most companies that specialize in a few products, they are starting to branch out into other products. Razer started with gaming systems, then into the wearables market with the Nabu. Now, Razer has partnered with NZXT to do a custom edition of NZXTs H440.