An XP2400 (Thoroughbred) has a clock speed of 2.00Ghz (15 x 133).
You should be able to improve performance by switching to 10 x 200 FSB to
match your memory (no overclocking involved), if your system can handle that
high an FSB. Set your memory to 100% in the BIOS.
Mine loses stability above 190 FSB.