 "Sapphire RADEON R7 240 with Boost graphics card - Radeon 4 GB" " Sapphire GB 11216-02-20G Video Cards CDWG.com
"The SAPPHIRE R7 240 with Boost now has the latest DDR3 memory clocked at 1800MHz effective, and runs with a core clock speed of 730 MHz which with PowerTune Dynamic Boost rises to 780 MHz on the engine." 
 "DDR3 SO DIMM 4GB. PC1600 CL11 SR" SR | Tradineur.com"
"Capacidad total: 4 GB; Frecuencia (Bus clock rate): 1.600 MHz; Tecnología: DDR3 tft; Kit: No; Tipología: SO-DIMM analogico; Generica: Sí" 