Undervolting:
The GPU responds well to undervolting, still allowing for an increase in core clock while simultaneously reducing temperature, power consumption, fan speed, and fan noise compared to stock settings. Not bad! Undervolting this card also has the benefit of reducing inductor noise, aka coil whine. At stock it's pretty bad. The voltage/frequency curve used for testing is pictured below:
Fan Speed:
The fan curve has a limited range (44-100% or 1350-3000 RPM) and there's no zero RPM mode at low temperatures. This is similar to the 1080 Mini which means that even at idle it's a little noisy. Under load, the fans spin up loudly to about 1900 RPM and have a slight pulsing sound or beat frequency.
BIOS Modding:
I'm not the first to do this (
@CubanLegend famously BIOS modded his 1080 Mini), but I wanted more fan control for the Noctua fans, so I flashed an
EVGA BIOS onto the card using
this guide. The EVGA BIOS was selected because it has full range fan control (0-100%) and has the same default and max power limits of 250W and 300W, respectively.
With the EVGA BIOS the fans start and stop occasionally when the card is idle, but they're inaudible when doing so. I chose to set a custom fan curve that keeps the fans spinning at 15% or ~550 RPM and is also inaudible. At 70%, the Noctua fans max out.
Noctua Fans:
As some of you may know, there are two variations of the NF-A9x14 fan. The
2500 RPM variant is only bundled with some of Noctua's coolers while the
2200 RPM variant is sold individually. I tested both types and they perform identically at matched RPM settings. However, the extra range of the "2500 RPM" NF-A9x14 is useful for keeping the card cool at the expense of noise. That said, the noise tone is smoother for either of these fans at any speed when compared to the stock Zotac fans. The fans were held securely to the GPU heatsink using zip ties, as pictured below. This works surprisingly well.
Fan Adapter:
I powered the Noctua fans off the GPU using a
fan adapter. The seller made the common mistake of wiring the RPM signal twice, but this was easily fixed by removing one of the wires. You can also buy a
Gelid adapter and use any fan splitter. A third option is plugging the fans into the motherboard and controlling them with SpeedFan, but I haven't tested this.