Kingston KF556S40-16 2×16 GB vs Samsung fastlött LPDDR5-6400 4×4 GB
Short answer: which is best?
Kingston KF556S40-16 2×16 GB is 85.6 % stronger than Samsung fastlött LPDDR5-6400 4×4 GB. Kingston KF556S40-16 2×16 GB ranks #17 of 42 measured memory kits at WhatFPS (8,815 RAM score over 1 verified runs). Samsung fastlött LPDDR5-6400 4×4 GB ranks #39 of 42 measured memory kits at WhatFPS (4,749 RAM score over 1 verified runs). The numbers are measured in 2 verified WhatFPS runs — not estimated, not self-reported.
Measured comparison
| Metric | Kingston KF556S40-16 2×16 GB | Samsung fastlött LPDDR5-6400 4×4 GB |
|---|---|---|
| RAM score (the kit's own performance: bandwidth + latency) | 8,815 | 4,749 |
| Best rig (GAMING — whole PC) | 7,938 | 1,655 |
| Bandwidth, one thread | 27,859 MB/s | 12,377 MB/s |
| RAM latency (lower is better) | 95.4 ns | 146 ns |
| Rated speed | 5,600 MT/s | 6,400 MT/s |
| Runs at (seen, avg) | 5,600 MT/s | 6,400 MT/s |
| Capacity | 32 GB | 16 GB |
What the numbers mean
The RAM score is the kit's measured performance in the rigs it sat in — single-thread bandwidth and latency beyond L3. Platform, BIOS settings and whether XMP/EXPO was on all affect it. GAMING is the whole rig's score. We show both and never mix them.
All numbers come from our benchmark suite, the same test on every PC, written in Rust with no middleware. The methodology is open at https://whatfps.com/metodik
All measurements for Kingston KF556S40-16 2×16 GB · All measurements for Samsung fastlött LPDDR5-6400 4×4 GB