|The first link is the builder series, which is OK. |
40A on the 12V rail is normally good. However, high end graphics cards can draw close to 20A off the 12V rail by themselves.
The motherboard you have doesn’t support Crossfire. You need 2 PCEe x16 slots for that.
I don’t see where you mention a CPU. The board supports AMD processors up to 125W. That will draw another 10A off the 12V rail under full power. If you haven’t yet bought a CPU take care to get a compatible one. Some can exceed 125W.
So you need to know what graphics card/s you plan on installing, or at least plan for it.
Another point to mention is that it is good practice to install the processor/HS/fan and the RAM prior to installing in the case. No sense in unnecessary flexing of the board. As mentioned above you should bench test the board.
Post what CPU and RAM you have in mind BEFORE buying them