For many years, it’s been assumed by a lot of people that buying high-end memory, or rather high frequency/low latency memory, is a waste of money. Obviously, however, there’s much more to it than that. In GPU-bound situations, what applies to the CPU will apply to memory as well. As such, if there’s merit in upgrading your CPU, then surely there’s merit in buying the more high-end memory as well.
Unlike with a CPU, you can’t readily tell what kind of memory a system has (you can see capacity or speed, but nothing about sub timings, latency, etc. from your Windows system info). However, you’d be surprised just how much faster a system with highly tuned or configured memory is as opposed to one where nothing has been tuned or configured accordingly.