100% . Tested works perfectly before .Please note: this memory is just for AMD motherboard, it does not fit motherboard or ECC Server .1333 MHz can be compatible with DDR 3 1066 MHzMemory chip:16IC;Type: DDR3 DIMM;Memory Channel: Dual ChannelFunction: Non-ECC;Memory Socket: Long--DIMM;Number of Pins: 240pin;Voltage:1.5VCapacity:4GB1066MHz =CL71333MHz =CL91600MHz=CL11Unbuffered, Non-ECC, & Non-RegisteredDDR3 1066= PC3-8500DDR3 1333= PC3-10600DDR3 1600= PC3-12800Pins of Memory RamDDR for Desktop =184 pinsDDR for Laptop =200 pinsDDR2 for Desktop =240 pinsDDR2 for Laptop =200 pinsDDR3 for Desktop =240 pinsDDR3 for Laptop =204 pinssize:13.3*3cmMaterial:PCBcolour:GreenPackage Contents:1 * 4GB DDR3 Memory RamOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.