I have a Sonata but for the moment haven't a rear case fan installed. Fortunately, the Zalman is good for spreading the air around. I will attach the heatsinks that came with the motherboard only because Epox wouldn't have included them if they didn't want them installed. I have a cheap 120mm fan next to the hard drive case running slow (Zalman resister put to good use there) but moving air. I have the 120mm Antec that came with the case but cut off the pin connector cause for a while I was using a Zalman ZM-MFC1 fan controller.
I moved the fan controller to another case where it's more needed. That controller is not designed for Antec cases with their rail design.
Hey, I just remembered something about the PSU. It's a 450W SuperFlower with a 120mm or larger fan with 3 speed settings. Until I get that 120mm rear case fan installed I'll just switch it on to high.
Note: I don't think the other fan speed sensors are working in the bios. I connect fans but I get no speed reading. I'll follow up on this soon.