Heatsink to heatsink with standardized fans, Phanteks (twin tower) is better than Thermalright Silver Arrow SB-E & Noctua NH-D14
The Phanteks PH-TC14PE also looks nicer...
The fans supplied aren't that loud, surprisingly. http://www.silentpcreview.com/article1345-page7.html
The Phanteks PH-F140HP/TS is the clear winner in every respect. It edged out the new Noctuas every step of the way, delivering the best overall results of any fan we've tested thus far. To top it off, it had cleanest, smoothest sound of all the new fans in this roundup. If we had to start from scratch, this might be our new reference model.
Our current 140 mm reference fan, the Noctua NF-P14 FLX held its own against the newcomers. It didn't cool quite as well as its successors but its acoustic character is still amongst the best you can find in a 140 mm model. For many, the new models' improvement in cooling ability isn't substantial enough to offset the superior sound of the older model. The fact this model has been discontinued is a shame — if you want one, get it now while you can.
The Noctua NF-A15 PWM and NF-A14 FLX followed close behind the Phanteks in our thermal performance test. The A15 has a smoother acoustic profile than the A14 but both sound fairly good to the ears. However, they share the misfortune of living in the shadow of the P14. The A15 and A14 have a rougher, muddier sound and neither is worthy of being a true successor.
Aside from our reference NF-P14 FLX, the PH-F140HP/TS had the best acoustics of the fans in this roundup, having a much cleaner profile than the latest offerings from Noctua. At higher speeds it sounded buzzy and turbulent as many fans do but at 900 RPM and below it was almost completely smooth, aside from a very faint clicking audible only at close proximity at 700 and 550 RPM.
Sample variance was minor. Of the three samples we had on hand, the white variant produced a slight tone at lower speeds while the black model was a tad whinier at full speed than the blue. The blue version used in our test had a superior sound though the other two were very similar.
The Phanteks produced excellent temperatures down to 700 RPM and only a very modest drop-off when moving from 700 to 550 RPM, earning it the best cooling result at this RPM of any fan we've tested.
The caveat is your motherboard must have voltage fan control if you buy a Noctua NH-D14/Phanteks PH-TC14PE.
My only issue with the Silver Arrow SB-E is its size. (extra 15mm width and 4mm height)
edit: Phanteks has the PWM PH-F140XP , Noctua has NF-A15 (PWM) and NF-A14 PWMEdited by AlphaC - 8/16/13 at 10:42am