GPU SKU Choice Re-Validation: A100 80GB vs 40GB¶
Stand: 06. April 2026 Status: Completed Decision: The project will proceed with the NVIDIA A100 80GB PCIe as the primary SKU for Phase A. The 40GB variant is rejected as a viable alternative for now.
Summary¶
As part of the Phase 0 execution plan, a re-validation of the GPU SKU choice was performed by analyzing live market data from Vast.ai. The primary goal was to determine if the A100 40GB PCIe model presents a more economically viable alternative to the A100 80GB model, primarily due to its significantly lower acquisition cost (approximately 50% of the 80GB model's price for refurbished units).
Market Data Analysis¶
A comparative analysis of the rental prices on the Vast.ai marketplace was conducted based on historical and live data.
| Metric | A100 80GB (Verified) | A100 40GB (Verified) |
|---|---|---|
| Latest Median Price | $0.7739/hour | $0.7872/hour |
| A100 80GB (Verified) | A100 40GB (Verified) | |
| ------------------------- | ------------------------ | ------------------------ |
| Latest Median Price | $0.7739/hour | $0.7872/hour |
| Historical Avg. Price | $1.1366/hour | $0.7872/hour |
| Metric | A100 80GB (Verified) | A100 40GB (Verified) |
| :------------------------- | :------------------------ | :------------------------ |
| Latest Median Price | $0.7739/hour | $0.7872/hour |
| Historical Avg. Price | $1.1366/hour | $0.7872/hour |
| Market Liquidity | Higher (more offers) | Lower (fewer offers) |
| Metric | A100 80GB (Verified) | A100 40GB (Verified) |
| :------------------------- | :------------------------ | :------------------------ |
| Latest Median Price | $0.7739/hour | $0.7872/hour |
| Historical Avg. Price | $1.1366/hour | $0.7872/hour |
| Market Liquidity | Higher (more offers) | Lower (fewer offers) |
The data surprisingly shows that the 40GB model does not currently have a significant price advantage in the rental market. In fact, at the time of analysis, it was marginally more expensive to rent per hour.
Conclusion & Reasoning¶
Despite the much lower Capital Expenditure (CAPEX) for the A100 40GB, the analysis leads to a clear decision to stick with the 80GB model for the following reasons:
- No Rental Price Incentive: The core assumption that a cheaper card could be rented out for a slightly lower but still profitable rate is not supported by current market data. There is no clear "budget" segment for the 40GB card that would guarantee high utilization.
- Market Demand & Liquidity: The market for the 80GB variant is significantly larger and more liquid. Focusing on the 80GB model means targeting the mainstream of the A100 market, likely leading to higher and more consistent utilization.
- Future-Proofing: As AI models grow in size (e.g., Llama 3 70B requiring >140GB VRAM), a server with 4x 80GB cards (320GB total VRAM) offers significantly more buffer and can service larger jobs than a 4x 40GB setup (160GB total VRAM). This increases the long-term revenue potential and asset lifetime.
The higher initial CAPEX for the 80GB model is justified by its superior revenue potential, market demand, and future viability. The project will not pursue the 40GB alternative further at this stage.