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 (79 vs 80.3). 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. The single most decisive one: Speed — 14.29% more. 6400 MT/s vs 5600 MT/s.

Pick the Server Premier DDR5-5600 64GB ECC if you care most about capacity. Its strongest claims are capacity. The single most decisive one: Capacity — 100.00% more. 64 GB vs 32 GB.

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.