G.Skill - Ripjaws M5 RGB DDR5-6400 32GB vs Kingston - Server Premier DDR5-5600 64GB ECC

These two are nearly even on the Mars Score (70.5 vs 72.6). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.

Pick the Ripjaws M5 RGB DDR5-6400 32GB if you care most about speed / cas latency. The biggest gaps in its favor are speed, cas latency.

Pick the Server Premier DDR5-5600 64GB ECC if you care most about capacity. Its strongest claims are capacity.

Both ship with comparable generation, so those specs do not separate the two — focus on the differences below.

Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.