Modkit
Small calculators for the jobs on this site. They run in your browser, store nothing and show the maths they use, so you can check every number by hand.
LGA 771 to 775 compatibility checker
Pick a Xeon and your board’s chipset and support list; get a pass, check or fail strip with the reasons.
FSB overclock calculator
Core clock, quad-pumped bus rating, memory clock and DDR rating from FSB, multiplier and ratio.
CPU cooler TDP headroom check
Estimate the heat of an overclock from stock TDP, clock and voltage, and compare it with a cooler rating.
PC power supply calculator
Add up an old or new build part by part and get a sensible power supply size and 12 V draw.
Background reading: motherboard compatibility for the Xeon mod, overclocking a Xeon on LGA 775 and sizing a cooler by TDP.