i think the problems are that these super hot CPUs are being OC'ed and not properly cooled. i would never recommend OCing without upgrading AT LEAST your case fans. my AMD 3400+ (2.2) is at 2.57 at 30 C idle with the Zalman 7000B, 3 80 mm and 1 120 mm. if they are overheating without any OC, it is possible to underclock the CPU in the BIOS advanced settings or Processor Settings. it is also possible that fans are no longer working properly, or a new component is blocking airflow. always try to keep PCI cards away from each other for easy air circulation.
AMD 64 3400+ s939 / ASUS A8V Deluxe (K8T800Pro) / Kingston Dual Channel DDR 400 (2 x 256) Corsair Value DDR 400 (2 x 512) / ATI Radeaon 9600XT / Seagate 120 GB/