Dual RTX 5090 workstation (2x 32 GB) vs RTX 5090 workstation (1x 32 GB)
Dual RTX 5090 workstation (2x 32 GB) · RTX 5090 workstation (1x 32 GB)
Verdict
- throughputThe RTX 5090 workstation (1x 32 GB) delivers approximately 28% higher aggregate decode throughput across the 8 models both machines can run (geometric mean of the per-model ratios).
- capacityBoth machines run all 8 compared models, so this is a pure speed and cost decision rather than a capability one.
- costAt 8 hours a day, the RTX 5090 workstation (1x 32 GB) has approximately 43% lower total monthly cost (€46 against €80), for a C corporation in United States (federal).
- powerThe Dual RTX 5090 workstation (2x 32 GB) draws 1180 W under load against 640 W for the RTX 5090 workstation (1x 32 GB) — a 1.8× difference that shows up in the electricity line and in how loud and hot the room gets.
- evidence2 of 8 model rows have at least one real measurement behind them; the rest are estimated from memory bandwidth. Margins below roughly 20% should not decide a purchase.
- recommendationThe RTX 5090 workstation (1x 32 GB) is both faster and cheaper to own here, so it is the straightforward choice unless you need something specific to the Dual RTX 5090 workstation (2x 32 GB).
Every statement above is generated from the calculations on this page by fixed rules — no prose is written for individual comparisons. If the numbers change, the verdict changes with them.
Hardware
| Dual RTX 5090 workstation (2x 32 GB) | RTX 5090 workstation (1x 32 GB) | |
|---|---|---|
| Price (NL, incl. VAT) | €5.854 | €3.332 |
| Memory | 64 GB | 32 GB |
| Memory bandwidth | 3,584 GB/s | 1,792 GB/s |
| Achieved bandwidth | 2,838 GB/s (79%) | 1,419 GB/s (79%) |
| Nominal power | 1400 W | 700 W |
| Measured load power | 1180 W | 640 W |
| Idle power | 110 W | 70 W |
| Architecture | 2× GPU | discrete gpu |
Model performance8 models run on both
Qwen3-Coder 30B-A3BQwen3 30B-A3BGemma 4 26B-A4Bgpt-oss-20bDeepSeek-R1-Distill 32BQwen3 32BGemma 4 31BQwen3.8 27B
| Model | Dual RTX 5090 workstation (2x 32 GB) | RTX 5090 workstation (1x 32 GB) | Winner |
|---|---|---|---|
| Qwen3-Coder 30B-A3B 30.532B (3.3B active) | ~236–339 t/s Q8_0 | ~333–480 t/s Q4_K_M | RTX 5090 workstation (1x 32 GB) +29% |
| Qwen3 30B-A3B 30.532B (3.3B active) | ~236–339 t/s Q8_0 | 352 t/s Q4_K_M | RTX 5090 workstation (1x 32 GB) +18% |
| Gemma 4 26B-A4B 25.806B (3.8B active) | ~216–311 t/s Q8_0 | ~303–435 t/s Q4_K_M | RTX 5090 workstation (1x 32 GB) +29% |
| gpt-oss-20b 20.915B (3.6B active) | ~324–466 t/s MXFP4 | 419 t/s MXFP4 | Tie (6%) |
| DeepSeek-R1-Distill 32B 32.764B | ~43.3–62.3 t/s Q8_0 | ~55.4–79.7 t/s Q4_K_M | RTX 5090 workstation (1x 32 GB) +22% |
| Qwen3 32B 32.762B | ~43.3–62.4 t/s Q8_0 | ~55.4–79.7 t/s Q4_K_M | RTX 5090 workstation (1x 32 GB) +22% |
| Gemma 4 31B 31.273B | ~45.2–65.1 t/s Q8_0 | ~62.1–89.4 t/s MLX 4-bit | RTX 5090 workstation (1x 32 GB) +27% |
| Qwen3.8 27B 27.781B | ~50.4–72.6 t/s Q8_0 | ~64.7–93.1 t/s Q4_K_M | RTX 5090 workstation (1x 32 GB) +22% |
Differences under 10% are reported as a tie: they are smaller than the spread between published benchmarks of the same configuration, so calling a winner would be false precision. Rows where a model fits on only one machine are decided by capacity, not speed.
Economics — United States (federal), C corporation, 8h/day
| Dual RTX 5090 workstation (2x 32 GB) | RTX 5090 workstation (1x 32 GB) | |
|---|---|---|
| Purchase price estimate | $5,854 | $3,332 |
| Reclaimable VAT | $0 | $0 |
| Net cash at purchase | $5,854 | $3,332 |
| Monthly depreciation | $82.94 | $47.21 |
| Monthly electricity | $7.98 (57 kWh) | $4.53 (32 kWh) |
| Tax programme | §179 100.0% | §179 100.0% |
| Tax-programme benefit | $1,229 | $700 |
| Monthly economic cost | $79.98 | $45.51 |
| Total over 5 years | $4,799 | $2,731 |
Tax assumptions last verified 2026-09-07. Federal planning estimate only, not tax advice. State and local income tax, sales/use tax and incentives are excluded. It assumes 100% business use, a Section 179 election, enough business income to use it, and that the full annual limit remains available.