Pushing For Speed
With testing out of the way, I endeavored to see if these sticks had any headroom. I left the voltages and timings alone (at their XMP defaults) and started increasing the frequency divider until the system failed to boot. At that point, I backed it down to the last bootable configuration and did some basic stability testing.
I was able to get 3400 MHz out of this kit with all other XMP settings at their default. Like many recent kits, pushing past that proved difficult. Raising voltages did not yield better results (highest tested: DRAM: 1.4 V, VCCSA: 1.35 V, VCCIO: 1.35 V). I also played with the timings (at the stock frequency) but didn't have much luck there either.
The XPG SPECTRIX D60G kit, for me at least, proved to have little overclocking headroom.