The SAPPHIRE R7 250 2GB with Boost now has the latest GDDR5 memory clocked at 4600MHz effective, and runs with a core clock speed of 1000 MHz which with PowerTune Dynamic Boost rises to 1050 MHz on the engine. 128 bit Memory Bus GDDR5 Memory Type 4600Mbps Effective Memory Clock 2048 MB Size 1 x Dsub 1 x DVI-D 1 x HDMI 384 Stream Processors 28 nm Graphics Core Next (GCN) 1000 MHz Engine Clock 1050 MHz Boost Engine Clock model : SAPPHIRE R7 250 2GB DDR5 WITH BOOST VERSION tag : Video - Graphic Cards