Two sticks, working pulls from my computer.

Product Specifications
Brand     Crucial
Form Factor     UDIMM
Capacity     1GB
Warranty     Limited Lifetime
Specs     DDR2 PC2-5300 • CL=5 • Unbuffered • ECC • DDR2-667 • 1.8V • 128Meg x 72 •
Series     Crucial
ECC     ECC
Kit Qty     1
Speed     667MHZ
Tracer     False
Voltage     1.8V
DIMM Type     Unbuffered