Kingston KTH-LJ2015 / 256 PC2-4200 Memory 256 MB (533 MHz, 144-pin, 1 x 256 MB) DDR2 SDRAM Kit (Personal Computers)
The RAM module has increased the 192MB memory of my HP LaserJet Pro 400 printer M475dw to 448MB. Current plug out, lid, locking in, lid, power plug in, work. Why HP would ask for 480 if it were available because, to me is a mystery.