Intel also have solutions like ICH10 vs ICH10R. Today they also support it on some chipsets. But you're 100% correct. I have friend who have few RAID controlle

Intel also have solutions like ICH10 vs ICH10R. Today they also support it on some chipsets. But you're 100% correct. I have friend who have few RAID controllers in his office just in case that one of it's servers fail. And all of them are purchased in same order to be from same batch.