This edition: HighVRAM maps the 40GB-to-94GB NVIDIA server-GPU decision across A40, L40S, A100 and H100. The useful question is not which product has the largest peak tensor number. It is which exact card, memory tier, software target and qualified host solve the measured workload without creating a cooling, form-factor or licensing surprise.
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What changed
The new A40 versus A100 comparison keeps the generation broadly constant while separating 48GB GDDR6 ECC from 40GB/80GB HBM, compute capability 8.6 from 8.0, A40 vGPU/display/NVLink behavior from A100 MIG and PCIe/SXM platform choices.
The L40S versus A100 comparison asks whether a newer 48GB Ada inference/media card is more useful than an older HBM accelerator whose 40GB variant actually exposes less capacity.
The L40S versus H100 comparison holds server deployment broadly constant, then isolates the move from 48GB Ada to 80GB/94GB Hopper, MIG and variant-specific NVLink/NVSwitch.
For active workstation installations, the parallel RTX A6000 versus A100 and RTX 6000 Ada versus A100 guides preserve the cooling and display differences instead of treating server accelerators as drop-in desktop cards.
The capacity boundary table
| Qwen3.5 artifact | Files | 40GB | 48GB A40/L40S | 80GB A100/H100 | 94GB H100 NVL |
|---|---|---|---|---|---|
| 35B-A3B Q8 + projector | 37.802GB | 2.198GB: unsafe | 10.198GB | 42.198GB | 56.198GB |
| 35B-A3B BF16 | 71.904GB | No file fit | No file fit | 8.096GB: bounded | 22.096GB |
| 122B-A10B Q4 + projector | 77.446GB | No file fit | No file fit | 2.554GB: unsafe | 16.554GB |
| 122B-A10B GPTQ-Int4 | 78.864GB | No file fit | No file fit | 1.136GB: unsafe | 15.136GB |
| 122B FP8 / Q8 + projector / BF16 | 127.163 / 130.781 / 250.173GB | No file fit | No file fit | No file fit | No file fit |
Three traps to avoid
- More bandwidth with less capacity: A100 40GB publishes more bandwidth than A40 or L40S but leaves only 2.198GB after the listed 35B Q8 files. Bandwidth does not rescue an unsafe memory boundary.
- “H100” is not one card: PCIe 80GB, SXM 80GB and NVL 94GB require different host, cooling, power and interconnect decisions.
- Passive does not mean easy: A40, L40S, A100 PCIe and H100 PCIe all need directed server airflow. A bare SXM module is not installable in an ordinary PCIe slot.
One useful action
If you can access two of these systems, run the same model artifact, runtime, precision, context, batch/concurrency and timing boundary, then submit the pair through the benchmark builder. Record exact product/variant, exposed memory, airflow, connector or SXM platform, MIG/NVLink state, placement/offload, prompt and generation metrics, peak device memory and repetitions. The current fixed database has no accepted A40, L40S, A100 or H100 observations.
Continue reading
- 48GB, 64GB, 80GB and 96GB capacity guide
- H100-to-B300 NVIDIA accelerator ladder
- Source-preserving benchmark database
- Private browser watchlist and RSS feeds
- Weekly Digest archive
Sources and limits
- NVIDIA A40 datasheet
- NVIDIA L40S specifications
- NVIDIA A100 datasheet
- NVIDIA H100 product page
- Qwen3.5-35B artifact sources and Qwen3.5-122B artifact sources
Published October 25, 2026. HighVRAM has not independently benchmarked every pair. File fit does not establish compatibility, speed, quality, reliability or value. Specifications and qualified configurations vary by exact SKU.