The Snapdragon X51 is the integrated modem Qualcomm built for the Snapdragon 690, which is essentially the same as the Snapdragon X55 and the X52 There is a certain inheritance relationship. There will be some technical inheritance between the various modems of Snapdragon, the main difference being in the capabilities. Qualcomm previously explained that the Snapdragon X55 modem has a maximum downlink rate of up to 7.5 Gbps and that the Snapdragon X52's maximum the downlink rate is 3.7 Gbps, and the maximum Qualcomm can support on the Snapdragon X51 is 2.5 Gbps.