When it came to overclocking we really had no joy. We got into Windows at 2040MHz DDR, but it wasn't really stable at the default timings and at 1.65v. While A-DATA say you can do 1.6v to 1.8v, we prefer to stick to the 1.65v mark that Intel say is the highest. It also creates an even playing field across the board when it comes to looking at the OC potential of other memory kits.
You can see the validation here.
While getting much over 2000MHz DDR caused a bit of trouble, getting to the default 9-9-9-24-1T setup at 2000MHz DDR wasn't an issue using 1.65v, which can be seen above. While it's nice to get a bit more power out of a kit, you can't complain about the modules having no trouble getting to their stock settings.
Important Editor Note: Our maximum overclocking result is the best result we managed in our limited time of testing the memory. Due to time constraints we weren't able to tweak the motherboard to the absolute maximum and find the highest possible FSB, as this could take days to find properly. We do however spend at least a few hours overclocking every motherboard to try and find the highest possible overclock in that time frame. You may or may not be able to overclock higher if you spend more time tweaking, or as new BIOS updates are released. "Burn-in" time might also come into play if you believe in that.