# R5: FX100 KV Cache Benchmark (14B, HBM Efficiency)

> This report answers whether an external KV tier can stand in for GPU memory. A seven-way comparison on a 14B model (GDS direct read, recompute at two HBM sizes, direct read with low HBM) builds a three-step argument for HBM equivalence. The platform is a single MetaX N260 GPU; the method carries across platforms, but the numbers are never mixed with MI308X results.

URL: https://vuke.top/en/evidence/R5 · Updated November 12, 2026

This report answers whether an external KV tier can stand in for GPU memory. A seven-way comparison on a 14B model (GDS direct read, recompute at two HBM sizes, direct read with low HBM) builds a three-step argument for HBM equivalence. The platform is a single MetaX N260 GPU; the method carries across platforms, but the numbers are never mixed with MI308X results.

- Report: R5
- Date: 2026-07-03
- Type: Benchmark report (official edition, No. -004)
- Test platform: Single MetaX N260 GPU

## Key findings

- An external KV tier can stand in for 128 GB-class HBM residency
- Seven comparison groups cover GDS direct read, recompute at two HBM sizes and low-HBM direct read

## Figures this report supports

| Metric | Value | Baseline | Detail | Source |
| --- | --- | --- | --- | --- |
| HBM residency an external KV tier can stand in for | 128 GB | MetaX N260 single GPU, 14B model, seven-way comparison | Conclusion of a seven-way comparison on a 14B model: an external KV tier can stand in for 128 GB-class HBM residency. That campaign ran on a single MetaX N260 GPU; the method carries across platforms, the numbers are not mixed with MI308X results. | Measured · [R5](https://vuke.top/en/evidence/R5) |

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