Trends in waterblock design don't change often. Until recently, it was thought that jet-impingement was the best way to go for achieving the lowest temperature when cooling a processor. Then came along quad-core CPUs, and it became evident that we must look at other ways of cooling these beasts – their core surface is very large, so waterblock designers were forced to return to old-school, large surface area waterblocks. The Apogee GT is one of the first blocks that attempts to offer jet-impingement performance from a block relying on a simple array of copper pins – can it succeed?

http://www.techpowerup.com/reviews/Swiftech/Apogee_GT

*sigh*

The real performance advantage of the Apogee GT(X)'es are with quad core processors. They explain so themselves on the first page, give it a nice theory... and then go ahead and test it on an opteron...

I can tell you though that the performance of the apogee - when applied to a quad core - is indeed superior to the NexXxos XP from Alphacool (the original, not the highflow).