Perseus Vault × AMD Instinct

Encrypted, local-first, persistent memory for AI agents — kept off the GPU so every byte of MI300X HBM serves tokens.

AMD Developer Hackathon: Act II — Unicorn (Open) Track. Built on Perseus Vault — a shipping MIT-licensed memory engine (v2.19, 32 releases, 55 MCP tools, live on PyPI and the MCP registry), not a weekend build. lablab project: lablab.ai/…/perseus.

▶ Judges, start here — try the live demo: amd-demo.perseus.observer

Teach the agent a fact, open a brand-new session, and recall it — then watch an open-weight LLM (gpt-oss-120b) answer live via the Fireworks AI API using only what it recalled. Recall + footprint run on the host CPU (0 bytes of GPU HBM); the demo's cross-vendor economics table shows the projection model (MI300X and 2×H100 are now both measured — see the banner below). Run a decay tick too. No login, per-visitor sandbox, daily budget cap on inference.

Fireworks AI is this hackathon's designated inference partner — the organizers describe the credits as access to "models hosted on AMD-hardware", and Fireworks is partnering with AMD to serve on Instinct accelerators. Like any serving API it does not attest which accelerator handles a given request, so we do not claim one ourselves. The memory layer never touches a GPU regardless.

⚠️ Honesty banner (please read)

We rented a real AMD Instinct MI300X and measured the claims everything rests on, serving Qwen2.5-72B on vLLM/ROCm (host: AMD EPYC 9474F). Measured (medians): one card holds 15.3 concurrent 72B agents at $0.143/agent-hour (validating our $0.133 projection); sustained 658 output tok/s (peak 1,088) = $0.92/1M output tokens at retail rental — untuned bf16, no FP8/AITER, a floor not a ceiling; and the load-bearing result: with the MI300X saturated serving the 72B, recall on the host CPU moved ±0.6% (median of 6 runs, 18.7 → 18.8 ms p50). The memory layer steals ~zero inference cycles, proven under real load (BENCHMARKS §3a). We then rented 2× H100 SXM and measured the cross-vendor claim too: best-case 5.0 concurrent agents at $1.68/agent-hr vs the MI300X's 15.3 at $0.143 — 11.7× measured-vs-measured (a single H100 cannot load the model at all). Only the A100 row remains a projection. Every number in this repo is tagged with a data_source: measured (timed live, reproducible now), published-spec (vendor datasheet / cloud price list, cited below), or projection (derived from published-spec inputs with stated assumptions). No projected number is presented as measured. The demo and benchmark scripts print this warning on every run.

Problem

An AI agent is only as smart as what it remembers — but its "memory" is usually just the LLM context window, which dies when the session ends. The common fix is to bolt on a vector database: embed everything, store the vectors, do nearest-neighbour search at recall. That buys persistence at a steep price:

• a second system of record (Postgres/pgvector, Pinecone, a Docker sidecar) that drifts out of sync with the agent's state;

• an embedding model on the hot path for every write and query — latency and GPU cycles spent before the actual model runs;

• HBM pressure — if the index or embedder shares the accelerator, it eats the very memory you wanted for weights and KV cache.

On an AMD Instinct MI300X, that last point is the whole game. Its 192 GB of HBM3 is the scarce resource. Every gigabyte spent storing what the agent knows is a gigabyte not serving tokens.

Two markets feel this hardest. Teams bleeding tokens re-feeding the same context into every session; and regulated orgs — finance, defense, healthcare, the ones already banning cloud AI tools — that legally cannot send agent memory to a cloud API at all. A vector-DB-in-the-cloud serves neither well. An encrypted, local-first, off-the-GPU memory layer serves both.

Related MCP server: Eternity MCP

Solution

Perseus Vault is a single Rust binary that gives an agent durable memory over the Model Context Protocol (MCP). Its recall path is SQLite + FTS5 hybrid search (BM25 lexical ranking blended with a recency/decay prior) — no embedding model, no external vector database, no GPU.

That's the design, not a limitation. The memory layer runs on the host CPU beside the accelerator, so:

• 100% of the MI300X's 192 GB HBM3 stays available for weights + KV cache.

• Recall adds zero GPU work and never competes with inference for the accelerator.

• One GPU backs many concurrent agents — each with its own AES-256-GCM-encrypted memory file (~85 MB RAM + ~45 MB disk per 100K memories, measured), because those files live in host RAM/disk, not HBM.

Architecture

                     AMD Instinct MI300X (192 GB HBM3)
                  +------------------------------------+
 user turn ─────► | LLM weights + KV cache (inference) |
     ▲            | via Fireworks AI / vLLM / ROCm     |
     │            +------------------------------------+
     │ recall THEN infer     ▲ grounding │ tokens
     │                    ┌───────────────┐
     └────────────────────┤  Agent loop   │
                          └───────────────┘
                             ▲ remember() / recall() / decay()  (MCP, CPU only)
                    ┌───────────────────────────────┐
                    │ Perseus Vault (Rust binary)    │
                    │ SQLite+FTS5 · AES-256-GCM      │  ── 0 bytes HBM
                    │ one portable .db file / agent  │
                    └───────────────────────────────┘
                          host CPU + RAM + disk

Full write-up: docs/ARCHITECTURE.md.

Benchmarks

Full tables, sources, and reproduction steps: docs/BENCHMARKS.md. Reproduce §1–§2 with python3 src/benchmark.py.

Recall latency stays in low milliseconds as the store grows 100× — measured

Reference implementation (src/benchmark.py, AMD-CPU laptop, Python 3.14):

Shipping engine (Perseus Vault v2.19.x, measured, AMD CPU — see PERF.md): FTS5 recall 17.0 ms p50 / 19.4 ms p99 @100K; bulk insert 98,732 entities/s.

Footprint stays tiny — measured

One accelerator serves N agents — measured on MI300X and 2×H100

Measured on both sides (2026-07-09, same model, same vLLM 0.19.1, n=3 medians — BENCHMARKS §3a–3b):

11.7× lower $/agent-hour and 3.7× lower $/token — measured, not projected. At the identical configuration the H100 pair serves zero 8K requests (KV exhausted); its 5.0 figure is the best case that boots. (H100 does win per-stream decode latency, 39 vs 83 ms TPOT — stated plainly.) The A100 row of the old comparison remains a projection ($0.47/agent-hr; we did not rent A100s). Perseus Vault memory runs on the CPU ($0.0004/agent-hr ≈ 0.3% of the agent's cost) and uses 0 bytes of HBM. Reproduce: python3 src/economics.py (projection model) + BENCHMARKS §3a–3b (measured runs, exact commands).

Quick start

git clone https://github.com/tcconnally/perseus-amd-act-ii.git
cd perseus-amd-act-ii

# 1) Run the agent end-to-end (stdlib only, no GPU, no network needed):
python3 src/agent_memory_demo.py

# 2) Reproduce the measured benchmark tables + economics:
python3 src/benchmark.py            # add --quick to skip the 100K row

# 3) (optional) Real inference via the Fireworks AI API (open-weight model):
cp .env.example .env                # then set FIREWORKS_API_KEY
python3 src/agent_memory_demo.py

# 4) (optional) Run against the real Perseus Vault Rust binary:
curl -sSf https://raw.githubusercontent.com/Perseus-Computing-LLC/perseus-vault/main/scripts/install.sh | sh
PERSEUS_VAULT_BIN=~/.local/bin/perseus-vault python3 src/agent_memory_demo.py

Docker (ROCm base — GPU-ready)

docker build -t perseus-amd-act-ii .          # FROM rocm/dev-ubuntu-22.04:6.2
docker run --rm perseus-amd-act-ii            # runs the demo
docker run --rm perseus-amd-act-ii python3 src/benchmark.py --quick

# On an AMD GPU host, expose the accelerator:
docker run --rm --device=/dev/kfd --device=/dev/dri --group-add video \
  -e FIREWORKS_API_KEY=... perseus-amd-act-ii

Published-Spec Estimates

GPU rows above are not measured. They come from vendor datasheets and 2026 cloud price lists:

• AMD Instinct MI300X — 192 GB HBM3, 5.325 TB/s bandwidth, 1,307.4 TFLOPS FP16 (peak), 750 W TDP. AMD MI300X datasheet (PDF) · product page · ROCm software: rocm.docs.amd.com.

• NVIDIA H100 SXM — 80 GB HBM3, 3.35 TB/s, ~989 TFLOPS FP16, 700 W.

• NVIDIA A100 80GB SXM — 80 GB HBM2e, 2.039 TB/s, 312 TFLOPS FP16, 400 W.

• Cloud pricing (2026, per-GPU-hour): MI300X median ~$2.72 (from ~$1.99); H100 ~$3.93; A100 80GB ~$1.80. Sources: cloud-GPU price trackers (getdeploying, thundercompute, gpucost.org), July 2026. Spot prices vary — but the headline cross-vendor ratio no longer depends on tracker prices: it is measured at the rates we actually paid ($2.19 MI300X, $8.38 2×H100 → 11.7×, BENCHMARKS §3b). Even at a findable ~$2.85/hr per H100 ($5.70 for the pair), the measured agent ceilings give $1.14 vs $0.143 → 8.0×.

• Model assumption: Llama-3.1-70B, FP16 weights ~141 GB; KV cache per 8K-token sequence ~2.5 GB (80 layers, 8 GQA KV heads, head_dim 128, fp16). Derivation lives in src/economics.py.

What We Measured on Real AMD Hardware — and What's Next

We rented real MI300X time (twice) and measured the load-bearing claims; the rest stay on the list (details in docs/BENCHMARKS.md §4):

1. ✅ Done — recall on the host EPYC CPU while the MI300X is busy. +0.6% under a synthetic 100%-utilization matmul (97.4 TFLOPS FP16, §1) and ±0.6% (median, 6 runs) under a real vLLM serving load of Qwen2.5-72B (§3a). The CPU memory layer steals ~no accelerator cycles.

2. ✅ Done — true concurrent-agent ceiling: 15.3 measured from vLLM's KV-cache budget serving a 72B on one MI300X (vs the ~20 idealized projection) — §3a.

3. End-to-end agent-turn latency (CPU recall + MI300X generation) vs a vector-DB baseline.

4. ✅ Done — measured $/agent-hour: $0.143 ($2.19/GPU-hr ÷ 15.3 agents) — §3a. Still open: peak serving throughput → measured $/1M tokens (our current throughput data is a single-process floor, so we don't headline it).

5. A ROCm/HIP prototype offloading Perseus Vault's dense re-rank to an idle GPU slice — an open question we'd answer with data, not claims.

Bonus building block: Gemma on AMD — the whole agent on one chip

The hackathon's partner challenge asks for the best AMD-hosted Gemma project. On Fireworks, Gemma is on-demand — you deploy it yourself, and even the cheapest option (Gemma 4 E4B) bills ~$7/hour while idle. Rather than pay to keep a model warm, we did the more on-thesis thing and self-hosted Gemma on AMD silicon for $0: src/gemma_on_amd.py runs the same recall→infer architecture with Gemma 3 (4B-it, Q4_K_M GGUF) served locally by llama.cpp on an AMD CPU, right beside the Perseus Vault memory layer — the fleet story scaled down to a single chip, with no idle-billing meter running.

Measured on an AMD Ryzen 7 9800X3D (measured, reproduce with the script): recall 0.21 ms + Gemma generation ~13 tok/s wall-clock — no GPU, no cloud, no API key. One architecture across the AMD lineup: Gemma on a Ryzen/EPYC host for single-agent boxes, a 70B-class model on MI300X for fleets — and the memory layer never moves.

# 1) llama.cpp:  winget install ggml.llamacpp   (or: brew install llama.cpp)
# 2) an open Gemma GGUF:
curl -LO https://huggingface.co/ggml-org/gemma-3-4b-it-GGUF/resolve/main/gemma-3-4b-it-Q4_K_M.gguf
# 3) serve + run:
llama-server -m gemma-3-4b-it-Q4_K_M.gguf --port 8081 --ctx-size 8192 &
python3 src/gemma_on_amd.py       # prints your CPU + measured numbers

What's in this repo

Not a weekend hack — a shipping product

Most hackathon entries are born this week. Perseus Vault is a real product we brought to AMD — which is why the memory layer here is production-grade, not a prototype:

• Mature: v2.19, 32 releases, single ~8 MB Rust binary, 55 MCP tools, AES-256-GCM.

• Distributed everywhere agents live: published to PyPI as five framework adapters — LangChain, CrewAI, PydanticAI, Haystack, Google ADK — and listed in the MCP registry, Smithery, and Glama (server.json / smithery.yaml / glama.json).

• Running in production today. (The live demo above runs this repo's CPU reference implementation of the same recall path — see webdemo/ — not the Rust binary.)

Why this matters to AMD

Agent memory is a real, growing market (Mem0, Letta, Zep). Today those stateful-agent workloads default to NVIDIA. Perseus Vault removes the reason they'd have to: by keeping memory off the accelerator, it makes the MI300X's 192 GB HBM3 the cheapest place to run a fleet of durable agents (measured $0.143/agent-hr on a real MI300X — 11.7× under a measured 2×H100 baseline, see benchmarks). And because the memory is local-first, air-gap mode loses nothing — the regulated buyers who most need on-prem get the full product, not a degraded one (many stateful-agent tools quietly disable their best features offline; ours don't). In one line: Perseus Vault turns AMD Instinct into the economical home for the agent economy — an adoption wedge for Instinct, not just another memory tool.

About

Built by Perseus Computing LLC (Wyoming). Perseus Vault is MIT-licensed and production-deployed. This submission is original and MIT-compliant.

License

MIT © 2026 Perseus Computing LLC.