With today's memory prices, a frequent question at Phoronix and throughout many organizations is about reducing cost by not necessarily populating all memory channels. Especially with modern servers going up to 12 memory channels per socket or even 16 memory channels with upcoming EPYC Venice, you may be curious about the performance impact of populating less memory channels to see if the trade-off is worthwhile given today's DDR5 RDIMM pricing. In this article are benchmarks from a Dell PowerEdge server looking at a dual AMD EPYC 9655 2P configuration when testing between four and the full twenty-four DDR5-6400 RDIMM configuration and the resulting performance impact in more than 250 benchmarks.