For a $160 processor, the Pentium 4 520 at 3.57GHz performs quite well. The chip was nearly as fast as the Pentium 4 560 3.6GHz, which costs almost three times as much. If I could guarantee that every P4 520 would run comfortably at almost 3.6GHz, I'd be inclined to recommend it to overclocking enthusiasts. The fact that I was able to hit 3.57GHz with stock air cooling and only a minor voltage tweak at least suggests that the Pentium 4 520 has headroom to spare, but finding a motherboard that will get around Intel's chipset-level anti-overclocking measures may be the greatest challenge in overclocking the thing.
Still, the Pentium 4 520's performance is largely unremarkable, even with an extra 770MHz on its side. Prescott remains a strong performer with 3D rendering and video encoding applications, but for gaming, you're better off with a mid-range Athlon 64. I should also mention that the Pentium 4 520's temperature-controlled processor fan spun significantly louder at 3.57GHz than it did at 2.8GHz. Even at 2.8GHz, the Pentium 4 520's cooling fan is louder than my Athlon 64 3500+'s stock cooler.
On a more academic note, our overclocking results hint at what Prescott's performance might look like with a 1066MHz front-side bus. The fact that we used high-latency DDR400 memory makes comparing our 3.57GHz chip to the Pentium 4 560 3.6GHz a little dicey, but based on our results, it doesn't look like a faster front-side bus would help Prescott all that much. Perhaps it's best that the upcoming Pentium 4 600 series is rumored to get an L2 cache boost up to 2MB rather than a front-side bus bump to 1066MHz.
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