Older, hotter, Palomino 0.18u core @ Geeks: "AMD Athlon SFF Palomino Desktop 35W Socket A CPU". You may get more Mhz for the money with newer chips.
I've taken old machines to higher speeds with the cooler 0.13 Thoroughbred XP chips ($42 shipped from Newegg, or $30 shipped as refurbs). They run faster, cooler, and use less power than this used chip from the Geeks.
Take an original Athlon 1700XP, (normally 1467Mhz, with 133MHz bus and 11X multipllier), and run it with a 100Mhz bus and you have 1100 Mhz. It is underclocked so much that it can be run with a lower core voltage. This is what you are buying from the Geeks.
I have an old Via chipset board with limited stable power to the cpu. It could run stable with an original Athlon 900 950 maybe 1GHz Thunderbird (about 50 watts tops). Now it is running as an Athlon "1750XP", at 1.5GHz, with an Athlon XP Thoroughbred (the 3 year old bios just calls it an Athlon 1500). The chip bridges were cut to set a 15x multiplier, the board runs it with a 100Mhz fsb, and the Vcore was left at the 1.5V default (for this Tbred A chip, but some "B"s came with 1.6V cores).
Several online guides exist for cutting and painting the chip bridges, if need be, to get the desired multiplier and core voltage. There are also online voltage and wattage calculators for AMD and Intel chips. I definitely got more speed with the newer chips, and did it for less than the cost of this CompGeeks chip.