The Corsair stuff is budget - I've not had good luck in the past with budget ram.
False impression?
http://www.corsair.com/company/aboutus
Founded as Corsair Microsystems in 1994, Corsair originally developed Level 2 cache modules for OEMs. After Intel incorporated the L2 cache in the processor with the release of its Pentium Pro processor family, Corsair changed its focus to DRAM modules, primarily in the server market. In 2002, Corsair began shipping DRAM modules that were specifically designed to appeal to computer overclocking enthusiasts. From its roots in high-performance memory, Corsair has expanded its award-winning product portfolio to include ultra-efficient power supplies, builder-friendly cases, ground-breaking CPU coolers, blazing-fast solid-state drives, and other key system components.
They can save costs, because they are not a reseller.