Asus M4A78T-E Socket AM3/ AMD 790GX/ Hybrid CrossFireX/HDMI/A&V&GbE/ATX Motherboard CPU - AMD Socket AM3 ;Phenom II /Athlon II /Sempron 100 Series Processors, AMD 140W CPU Support, AMD Cool 'n' Quiet Technology, Supports 45nm CPU, Chipset - AMD 790GX/SB750, Form Factor - ATX Form Factor (12 in. x9.6 in.), Memory - 4 x DIMM, Max. 16 GB, DDR3 1600(O.C.)/1333/1066 ECC,Non-ECC,Un-buffered Memory, System Bus - Up to 5200 MT/s HyperTransport 3.0 This motherboard has AMD Cool 'n' Quiet Technology and ASUS Q-Fan2 technology which work together to reduce CPU heat and noise generated by CPU FAN to cool CPU. As result it takes some time for the CPU fan to actually start spinning to cool the processor. In many instances when PC is at idle CPU FAN will not spin at all and will stay that way until CPU gets hot enough to be cooled down. Other potential installation mistakes could also produce this result. If add on video card is used it must be PCI-E 2.0 compatible. Please note that PCI-E 3.0 products may not be compatible. We have provided bellow CPU support list along with other useful information to address this problem. Please make sure that CPU used is on the CPU support list. Use of different processor then on the support list may result in irreversible damage to the motherboard, CPU and/or other components used. Additionally, the motherboard's packaging, instructions, and manufacturer's information are all in Chinese." - In this case "does not work" could be for various reasons and - in this instance - more information is required to determine the reason. Manual, Drivers and other tools and information for the motherboard is available on the disk that comes with the item and also on the website in several different languages.