This is the fourth time I buy bars of Kingston (Kingston Value 1 *, 2 * and Kingston Hyper X Kingston Beast * 1) in 6 years and I have never had any problems. This is perfectly recognized in the BIOS DDR3-1333 CAS 9 and 4GB in Windows 64-bit too. The sinks are a little wider than normal bars but this is no problem for mounting and cooling is better. Too bad the DDR3 1333 is still so expensive compared to DDR3 1600 but Intel Celeron G1610 processor does not accept more basic.