AMD288 GB VRAM6,000 GB/s$3.5/hr

Phi-3 Mini 3.8B on AMD MI325X 288GB: Does It Fit, How Fast, What It Costs

Phi-3 Mini 3.8B at FP16 needs 7.6 GB for its weights and 33.4 GB in total at 8K context with 8 concurrent users. That means it fits on a single AMD MI325X 288GB. Every figure is computed by tokcalc's open-source capacity model.

Fits?
Yes, 1 GPU
33.4 GB needed / 288 GB available
Decode speed
513.2
tok/s per stream
Aggregate
6158
tok/s @ 8 concurrent
Cost / 1M tokens
$0.1579
1× AMD MI325X 288GB
What changes as you add AMD MI325X 288GBs
Tensor-parallel degree vs VRAM, throughput, and cost. Cost scales linearly with GPU count; decode throughput scales near-linearly too, so cost per token stays roughly flat.
GPUsTotal VRAMVRAM neededDecode tok/sAggregate tok/sTTFTCost / 1M tokFits?
1× AMD288 GB33.4 GB513.26158127.2 ms$0.1579✓
2× AMD576 GB33.4 GB872.42093778.8 ms$0.0929✓
4× AMD1152 GB33.4 GB17458374754.4 ms$0.0464✓
8× AMD2304 GB33.4 GB348933498942.2 ms$0.0232✓
Concurrency vs context length
On 1× AMD MI325X 288GB at FP16. KV cache scales linearly with context, so this is the number of users your GPUs can actually serve.
ContextConcurrent usersKV per requestFits?
4K1741.61 GB✓ fits
8K873.22 GB✓ fits
33K2112.88 GB✓ fits
66K1025.77 GB✓ fits
131K551.54 GB✓ fits
Other GPUs that run Phi-3 Mini 3.8B
Same workload, same quantization — ranked by value (tokens per dollar-hour).
GPUGPUsAggregate tok/sCost / 1M tok
RTX 5090 32GB2×6253$0.0444
AMD MI300X 192GB1×5439$0.1277
A100 40GB SXM41×1591$0.1572
A100 80GB SXM41×2053$0.1624
Intel Gaudi 3 128GB1×3387$0.1640
H100 SXM5 80GB1×3438$0.2020
Frequently asked questions

Can Phi-3 Mini 3.8B run on AMD MI325X 288GB?

Yes. Phi-3 Mini 3.8B at FP16 needs 33.4 GB including the KV cache, and AMD MI325X 288GB has 288 GB — so it fits on a single GPU.

How fast is Phi-3 Mini 3.8B on AMD MI325X 288GB?

513.2 tokens/sec per stream and 6158 tok/s aggregate with continuous batching at 8 concurrent users. Time to first token is 127.2 ms, and inter-token latency is 1.9 ms.

What does Phi-3 Mini 3.8B on AMD MI325X 288GB cost per million tokens?

$0.1579 per 1M output tokens at 1× AMD MI325X 288GB ($3.50/hr). That is the marginal hardware cost — add idle capacity, ops, and egress for the real figure.

How much VRAM does Phi-3 Mini 3.8B need on AMD MI325X 288GB?

7.6 GB for the weights at FP16, plus 25.8 GB of KV cache for 8 concurrent requests at 8K context — 33.4 GB total. Every extra concurrent user at long context costs more, so leave headroom.

Is AMD MI325X 288GB the right choice for Phi-3 Mini 3.8B?

It works. Compare $0.1579 per 1M tokens against the alternatives below — the cheapest option that fits the same workload is 4× RTX 3080 10GB at $0.0209, and the fastest is 1× Cerebras CS-3 (WSE-3) at 20526 tok/s.

Adjust the workload yourself

Same formulas, your context length, concurrency, and quantisation.

Open in calculator