Well, I seem to have lost the silicon lottery for starters. It's runs 4.4 GHz, but requires 1.369 volts to do it, and it refuses to run 4.5 at anything less than or equal to 1.5 volts. 4.3 GHz needs 1.275 V.
GPU actually boosts up to 1487 MHz consistently. There's a slight buzz from coil whine when running synthetic benchmarks, but not during day-to-day use or gaming. It's limited mostly by Nvidia's overvoltage limit (+37 mV).
Everything could run cooler if I wanted it to, but I value quiet. Or I could just not run my CPU at 1.369 volts...
This product gets a 5/5 from me not only because it's a fantastic product, but because of their customer support. This product does everything you expect it to do (including it's ability to get in the way), and it does it all in an excellent fashion (except the getting in the way part). It has fantastic fans, mounting hardware, packaging, and aesthetics. And it manages to be "large and in charge" without being too excessively so. You can even downsize the fans of you want to improve RAM or case compatibility, as the fan clips will work with 120mm fans. And I think you lose your first PCIe slot (or you may just have to use a card with a backplate), but as I have nothing to plug into that first PCIe slot, I can't comment.
I called their technical support regarding an issue with the mounting hardware (a hole was drilled crooked, preventing installation), and my call was picked up by a person. After a brief chat, I was directed to fill out a support request on their website, and that if I filled it out, and sent in my proof of purchase within the next hour, Phanteks could have my replacement pieces shipped out by the end of the day. So I filled it out, called customer service again (I even got the same service rep), emailed them my invoice, and within 2 business days, I had my replacement part. It fit, and the cooler is performing fantastically.
Aesthetically beautiful, but functionally boring. I turned on XMP, and it worked, as advertised.
Unfortunately for me, attempts at overclocking and tightening the timings failed miserably. Which is why it only gets 4 stars. I was hoping for a little bit of tweakability, and was surprised to get none. Of course, I could just be bad at tweaking memory, but regardless, a 4/5 seems like a fair rating for a product that did everything that it said it could, but did not exceed expectations.
Pros: Moves air with a surprising amount of force (see below). Padded corners (see below). Sleeved cables. Sturdy construction. Runs quietly at low to medium RPM, and noticeably but inoffensively at high RPM.
Other Thoughts: These are fantastic fans. I purchased a pair to augment the stock configuration of my Fractal Design Define R5, and they did their job beautifully, but there were a few complications along the way.
At first, I put one of the fans in the rear as an exhaust, and one in between my HDD cage and my PSU as a bottom intake. However, in the bottom intake position, the fan would intake air with enough force to pull up on the air filter (the filter is ever so slightly bowed away from the bottom of the case). At certain RPMs, this affect would vibrate the filter.
The vibration resulted in me swapping the locations of my 2 Phanteks fans with the stock fans. The stock fans are held in the front with pass through screws, which are just a tad too short. Though this fan is the standard 25mm thick, the padded corners add a millimeter or 2 of thickness, which meant my screws weren't long enough. So I had to take the pads off. They're easy enough to press fit into their notches if I ever need them again.
All in all excellent fans. Not bad for $10 each. (This is a copy of my review on Newegg)