46C isn't too bad really at full load, I'd never say it's stunning, but nothing to be worried about. Clock throttling comes in at 65 - 75C depending on the model of P4.
Also, I'm sure that win2k idles lower than win9x for example. In my laptop, I can use win2k for hours without the fan turning on, while in win98 the fan will turn on within 10minutes. If under full load the fan will turn on in about 5 minutes.
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2x P3 1100's at 1400, Abit VP6, 2x Corsair 256mb PC150 sticks, 20gb 'cuda ATA-III, 2x 40gb 'cuda ATA-IV in raid 0. 20" Trinitron. No fans
2x 2400+ at 2288mhz (16.0 x 143), Iwill MPX2, 2x Kingmax PC-3200 256mb sticks, 4x 20gb 60gxp in Raid 5 on a Promise SX6000. Asus Ti4200 320/630. Cooled by Water
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