Hmm... I'm running my 1.60A @ 2400MHz with 1.60V pumping through it and it's running pretty cool
(IMO). I never bothered to check the "stock" temps when running @ the default 1600MHz clock rate,
but I can tell you that MBM 5 reports a consistent 23C for the P4B266-C MB and depending on system
load, reports anywhere from 29C (Idle) - 48C (Prime95) for the Northwood P4 core. I'm pretty happy
with it... my Athlon XP 1700+ system ran much "warmer."
BTW, the case I'm using is an Antec SX1030 with a Sparkle FSP300-60BTVS 300 Watt PSU. Inside, I
have three (3) Sunon 80mm chassis fans (2 mounted in back, 1 mounted in the lower front). Maybe
you could tweak your case's cooling and ventilation a bit?
Regards,
EZ