I'm building a new system using an Antec P280 case, an Asus Z77 mobo, and an i5 3570K that I will OC to the 4.2-4.4GHz range. I have a CM Hyper 212+ sitting at home that, while not ideal, should be good enough to cool this system. I'm pretty new to building for quiet, so I'm wondering what fan I should pair with the Hyper 212+, and what, if any, I should add to the case.
I'm going for quiet, not silent. My current system is good enough, and consists of:
C2D E6400 OCed from 2.13->2.93 with stock Intel cooler
GTX 470 + 8800 GTS 640 video cards
Antec Tri-Cools on low (1000RPM?) at the rear and in the bottom chamber
Noctua NF-S12B FLX at 900 RPM at the top and also clipped onto the drive cage to blow on the video cards (adding one to blow on the GPU was a godsend in quieting down the 470 under load)
Not silent by SPCR standards, but good enough for me as I don't notice it sitting off to the side of my desk, and an example of what I can happily live with.
The Z77 motherboard has 4-pin PWM fan connectors (2 CPU, 3 chassis iirc). Do I need to pair it with 4-pin PWM fans, or will 3-pin PWM do? I feel hesitant to use a fixed RPM fan for the CPU heatsink, particularly as Ivy Bridge seems to run hotter.
For the Hyper 212+, I've seen the Scythe SY1225SL12LM-P recommended ($13 on Newegg), but it's a 3-pin fan. The only 4-pin PWM fans I know of are the Noctua NF-P12 PWM and NF-F12 PWM ($23 on Amazon), which I've seen conflicting opinions about, and the Noiseblocker PLPS, which I'm not too familiar with but is kinda expensive at $30 shipped.
For case cooling, I plan to move the front-most top fan to the front to blow cool air towards the video cards (. Would I need to add anything else, or should that be sufficient? Is there an advantage to using PWM fans for case cooling over fixed RPM fans?
Thanks for your help and advice.