512MB 100 pin DDR SDRAM DIMM for HP. Third Party Equivalent to HP Part Numbers: Q2628A Q7720A .BEWARE! DO NOT BUY FROM OTHER VENDORS WHO CLAIM THEY ARE SELLING PARTS-QUICK BRAND. OUR WARRANTY IS ONLY FOR ITEMS PURCHASED DIRECTLY FROM PARTS-QUICK. ALL PRODUCTS BRANDED AS PARTS-QUICK ARE TO BE SOLD SOLELY BY PARTS-QUICK. PARTS-QUICK DOES NOT AUTHORIZE THE USE OF IT"S BRANDED PRODUCTS TO OTHER SELLERS. . Compatible with:HP LaserJet 4250 4250n 4250tn 4250dtn 4250dtnsl