Yes, but you may have to adjust the settings manually. Some X58 motherboards default the memory speed to to 1066 even when 1600mhz memory are installed. Depending on your setup, you might have to change some bios settings to get it to run at the speed you want.If the motherboard says....
Memory Standard DDR3 800/1066/1333
Would 1600 memory still work, but just at 1333?
Yes. If you are putting in the same memory it will run tri-channel. The kits are just the same memory modules tested and sold together.If it says it is a dual channel kit, would it still work for triple channel if I used 3 sticks of it?