This is a single Crucial 32GB DDR5-5600 MHz SO-DIMM RAM Non-ECC Laptop RAM CT32G56C46S5.M16B2 stick pulled out of a working HP ZBook G10 laptop in this early October. It is tested working a moment ago. Sold as it is. No return is allowed. It shows 4800 MHz because that is the max speed frequency allowed in older Dell precision 3571 laptop used to test this single RAM stick. The actual max speed is 5600 MHz based on Crucial specs printed on the RAM sticker.