The Phoronix guys dig a bit deeper into the Quake 4 1.2.1 patch to discover whether or not the Hyper-Threading Technology and dual-core support is all it's cracked up to be.

"With Quake 4 now supporting Hyper-Threading and dual-core processors, players should expect to find significant performance gains when gaming. Two of the numbers that id Software have stated is a 25% performance jump compared to non Intel Hyper-Threaded CPUs and dual core processors should experience somewhere in the ballpark of a 87% performance boost."