I think you are fine. If you want to squeeze some pennies, go lower on the PSU.
Modular doesn't matter. 650w is way more than enough for those components.
Honestly, if he's just playing wow you can dial down the GPU a lot, too. Although, the 4890 is a steal ATM if you don't need DX11
Modular doesn't matter. 650w is way more than enough for those components.
Honestly, if he's just playing wow you can dial down the GPU a lot, too. Although, the 4890 is a steal ATM if you don't need DX11