The Mae is low end , non certified, old design , group regulated.
The master watt is 80 bronze, newer dc-dc design , 5 year warranty.
It costs more because it's a lot better.
Is the cx450m available in stock ?? Because it can run a 970 no issue & is better than either.
For **** sake, there are 2 different mwe550's It seems (cheers coolermaster)
That is a newer design unit than I said above , the masterwatt is still way better as are the newer corsair cx