I have no idea what your bief with Corsair is, but it is just plain nonsense:
Customer Reviews Of CORSAIR 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory - Retail
I have the kit running for 48 hours now, memtest86 tells me it's all perfect, and I have yet to experience instability.