Important Info on New Prescott CPUs
Intel is now selling several versions of the Prescott CPU that are different than normal CPU and due to the way the models are specified can be easily confused with the 400Mhz FSB Northwood CPUS but in fact are 533FSB Prescotts (that do not work on 400/533 FSB only motherboards).  The following two processors are Prescott core and will only work on Prescott certified motherboards (see this page).
ASI SKU 27478 2.8A 533 MHz BX80546PE2800E  16KB 1MB No Hyperthreading and will not work on 533FSB motherboard - see motherboard support chart
ASI SKU 26836 2.4A 533 MHz BX80546PE2400E 16KB 1MB No Hyperthreading and will not work on 533FSB motherboard - see motherboard support chart