The best way to improve printer performance and eliminate printer errors is to increase its memory. HP printer memory is proven to improve printing performance of complex documents by enhancing data flow. Printing needs have advanced from simple, word-processed documents to more complex files like color presentations, two-sided output, graphic-intensive PDF files and Web pages. The more complex the document, the more memory a printer needs to stay up to speed. 200 pin DDR SDRAM Part Number Q7721A Lifetime Warranty Guaranteed Compatible 30 Days Money Back Individually Tested 100% Guaranteed Compatible Printers: HP Color LaserJet 3000dn (Q7535A) HP Color LaserJet 3000n (Q7534A) HP Color LaserJet 3800 (Q5981A) HP Color LaserJet 3800 with HP Toner (Q5981A#ABA-BN) HP Color LaserJet 3800dn (Q5983A) HP Color LaserJet 3800dtn (Q5984A) HP Color LaserJet 3800n (Q5982A) HP Color LaserJet 4700dn (Q7493A) HP Color LaserJet 4700dtn (Q7494A) HP Color LaserJet 4700n (Q7492A) HP Color LaserJet 4700n with HP Toner (Q7492A#ABA-BN) HP Color LaserJet 4730mfp (Q7517A) HP Color LaserJet 4730x mfp (Q7518A) HP Color LaserJet 4730xm mfp (Q7520A) HP Color LaserJet 4730xs mfp (Q7519A) HP Color LaserJet 4730xs mfp Refurbished (Q7519AR) HP Color LaserJet CP4005n (CB503A)