Final build ended up looking like this:
PCPartPicker part list
Pretty much identical to the build I listed before, but with a Seasonic 550w 80+ gold certified modular PSU. Everything except for the GPU arrived on Tuesday, so I went ahead and started to assemble it. A couple hours later, I'm loading windows onto my first ever SSD. Awesome!
As I'm installing some drivers from the mobo-included disk, I realize the case (Antec P280) fans aren't turning. That makes sense, as I didn't actually see the power adapter nestled way back in the top-rear of the case. So after finishing up the drivers and rebooting once, I power down and plug in the single 4pin molex that drives the three case fans. Power back up, the CPU and case fans spin for about 0.25 seconds, and then everything cuts out completely. So I disconnect the case fans and boot up just to make sure that's actually the problem, and sure enough I'm looking at the desktop 10 seconds later.
I perform some more tests to try to isolate the problem:
- Run a modular cable from my current rig's PSU to the new case fans and boot the current rig. Current rig boots fine, new case fans all start spinning. Success.
- Use the same modular cable from last test to connect new PSU to new case fans. Failure.
- Use new PSU's modular cable to attach new PSU to three of the fans in my current rig's case (which combined *should* draw more power than the new case). Success.
- Try attaching the modular cable to a few different slots on the new PSU while connected to new case fans. Failure.
- With case fans not plugged in, insert new GPU (gtx970) and boot up. Success.
- With case fans not plugged in, run new GPU through a couple different benchmarking apps to attempt to draw max power. Success.
What am I missing here?