The P4 650 3.4Ghz had very good overall performance, as was evident in our tests, although naturally so, lower performance than the 660 3.6GHz. The CPU tests from PCMark or 3DMark reported that the 650 was better in many of the tests than the 3800+ from AMD. Audio, Video and DivX conversion are still some of the strong features of the Intel processors while in the case of games, AMD holds first place. However, in the case of overclocking, the 650 is to be extremely good. Even with the stock cooling system in place, you can easily ramp the clock up to 4.25GHz or if you choose a more efficient cooler, you can reach 4.42GHz.
The price of the Pentium 4 650 retail package is close to US$268 from newegg.com, while for an AMD 3800+ you'll need US$289 and for the 660, up to US$410. The price is rather good for what the CPU offers. Good overall performance with excellent overclocking ability make the P4 650 3.4GHz a good choice.