Am I asking the wrong question or does no one really know? During my research of PSUs I came across a couple articles that advised that there needs to be enough amps on the 12v rail to power your GPU and since I'm going to have two GPUs I want to make sure to get a powerful enough PSU.
See the little red switch on the back of the apevia? It tells you it lacks active PFC, almost all new designs have it because its required in many countries and is needed to get 80+ Certified. It also supplies 6A less on the 12V rail than the corsair. I would go for the 750TX for the slightly more that it costs.