Auburn-based custom computer maker Puget Systems, which caused a huge stir on YouTube three years ago with its ambitious aquarium PC project, is out today with a new-and-improved, third version of the machine.

It's still a novelty, more than anything else, but it's geeky and fun.

As in the past, the components of the computer are immersed in mineral oil in the aquarium, providing a high-efficiency cooling mechanism and, more to the point, putting the inner workings of the machine on full display. Differences in the new version include a tank that's twice as large as before, about 12 gallons.

"The system is larger, allowing for full eATX motherboards," explains Jon Bach, the Puget Systems president, in an email message. "It allows the power supply to be mounted on the motherboard tray, making it much easier to maintain the PC. It also has more than twice the cooling power! We built a test system with the most extreme hardware available, with impressive results."

The company is selling a do-it-yourself kit for about $670.