So if you’ve just recently purchased the Gigabyte GA-X58A-UD3R motherboard and encountered an error saying “Recovering Lost memory”. I bet that error only occurs when your attempting to use tri-channel? Try to boot the machine with memory in just the first two memory groups closest to the CPU. Does it show the full memory correctly?
It turns out that you could have a bent pin on your motherboard. I had a bent one and thought I fixed it, but I was stuck with dual channel until I exchanged the board.
Do yourself a favor, exchange your board ASAP if you have a bent pin. It’s causing tri-channel not to work.