Proof of Work

Proof of Work
The Proof of Work is a modified Momentum based algorithm. It has a small SHA512 component, and a large AES component – chips with AES-NI instruction sets will fare *much* better. Each hash requires 1GB of Memory to perform and encrypts 50GB of data. By contrast, the verification only requires 128K and less than one 10th of a second.

https://bitcointalk.org/index.php?topic=355532.msg3945848#msg3945848
http://en.wikipedia.org/wiki/AES_instruction_set#Supporting_CPUs