Looks kinda fake to me.
I don't think CPUs have enough energy stored in them to explode like that. They usually just smoke.
That and... there's a hole in the motherboard that goes through the table, so I'm thinking... real explosives, like a big firecracker or something, lol.
And also, in this video, you can actually see the guy reaching under the table to light the firecracker or whatever it is.
http://video.google.com/videoplay?docid ... 6151253701