 "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." 
 "Gigabyte AMD Radeon RX 550 2GB D5 Graphics Card"@en Card LN80158 - GV-RX550D5-2GD | SCAN UK"@en
"2GB Gigabyte Radeon RX 550 D5, 14nm Polaris, 512 Streams, 1183MHz GPU, 7000MHz GDDR5, DP/HDMI/DVI-D DL              "@en 