RTX 3090 workstation (Ryzen 9 7950X, 64 GB)
A 24 GB Ampere card that remains common in local-inference builds. Its 936 GB/s GDDR6X bandwidth is close to an RTX 4090's, while used pricing makes it an important baseline for 20B-30B quantized models.
NVIDIAcomponentAvailable13 models fit1 measured
Memory
24 GB
Official spec GDDR6X
Memory bandwidth
936 GB/s
Official spec ~75% achieved in practice
Specifications
CPU
AMD Ryzen 9 7950X Official spec
GPU
GeForce RTX 3090 24 GB Official spec
Memory
24 GB GDDR6X Official spec
Memory bandwidth
936 GB/s Official spec source
Achieved bandwidth ⓘ
~75% (702 GB/s) Measured
FP16 compute ⓘ
~142 TFLOPS Official spec
System RAM
64 GB Official spec
Architecture
Discrete GPU with dedicated VRAM Official spec
Nominal power
600 W Official spec
Measured load power
— Assumption
Idle power
— Measured
Released
24 Sept 2020 Official spec
Exact Ryzen 9 7950X, RTX 3090 24 GB and 64 GB DDR5 configuration. Hardware specifications are based on AMD and NVIDIA product documentation. The EUR 2,199 used-market estimate is anchored to an exact-match completed listing at USD 1,999 and checked against an active exact-match European listing; asking prices vary with component quality and condition.
Standout models on this machine
Fastest
Nemotron 3.5 Lightning 30B-A3B — ~213–307 t/s
Q4_K_M · estimated confidence
Largest that fits
Related hardware
Used RTX 4090 workstation (24 GB)24 GB · 1,008 GB/sRTX 5090 workstation (1x 32 GB)32 GB · 1,792 GB/sDual used RTX 4090 workstation (48 GB)48 GB · 2,016 GB/sRadeon AI PRO R9700 workstation (32 GB)32 GB · 644 GB/sDual RTX 5090 workstation (2x 32 GB)64 GB · 3,584 GB/sRTX PRO 6000 Blackwell workstation (96 GB)96 GB · 1,792 GB/s
Model performance on RTX 3090 workstation (Ryzen 9 7950X, 64 GB)1 measured, 12 estimated
13 of 13 rows
| Model↕ | Quant | Memory↕ | Decode▼ | Prefill↕ | Context | Fit | Confidence↕ |
|---|---|---|---|---|---|---|---|
| Nemotron 3.5 Lightning 30B-A3B NVIDIA · 31.578B (3B active) | Q4_K_Mrecommended | 20.0 GB | ~213–307 t/s | ~1520–3150 t/s | 192K | Borderline | Estimated |
| gpt-oss-20b OpenAI · 20.915B (3.6B active) | MXFP4recommended | 13.0 GB | ~205–295 t/s | ~1700–3530 t/s | 128K | Comfortable | Estimated |
| Qwen3-Coder 30B-A3B Alibaba Qwen · 30.532B (3.3B active) | Q4_K_Mrecommended | 20.0 GB | ~197–284 t/s | ~1470–3060 t/s | 16K | Borderline | Estimated |
| Qwen3 30B-A3B Alibaba Qwen · 30.532B (3.3B active) | Q4_K_Mrecommended | 20.0 GB | ~197–284 t/s | ~1470–3060 t/s | 16K | Borderline | Estimated |
| Gemma 4 26B-A4B Google DeepMind · 25.806B (3.8B active) | Q4_K_Mrecommended | 18.3 GB | ~176–253 t/s | ~1490–3100 t/s | 16K | Fits | Estimated |
| Qwen3 8B Alibaba Qwen · 8.191B | Q8_0recommended | 10.6 GB | ~62.1–89.4 t/s | ~1800–3740 t/s | 40K | Comfortable | Estimated |
| Phi-4 14B Microsoft · 14.66B | Q5_K_Mrecommended | 12.9 GB | ~52.4–75.4 t/s | ~1010–2090 t/s | 16K | Comfortable | Estimated |
| Devstral Small 24B Mistral AI · 23.572B | Q4_K_Mrecommended | 16.4 GB | ~38.8–55.8 t/s | ~627–1300 t/s | 32K | Comfortable | Estimated |
| Mistral Small 3.2 24B Mistral AI · 24.011B | Q4_K_Mrecommended | 16.6 GB | ~38.1–54.8 t/s | ~615–1280 t/s | 32K | Comfortable | Estimated |
| Gemma 3 27B Google DeepMind · 27.432B | Q4_K_Mrecommended | 21.3 GB | ~33.5–48.2 t/s | ~538–1120 t/s | 8K | Borderline | Estimated |
| Qwen3.8 27B Alibaba Qwen · 27.781B | Q4_K_Mrecommended measured: Q5_K_M | 18.1 GB | ~33.1–47.6 t/s Measured 74.88 t/s | ~532–1100 t/s | 32K evidence 1K | Fits | Estimated Measured · llama.cpp |
| Qwen3.6 27B Alibaba Qwen · 27.781B | Q4_K_Mrecommended | 18.1 GB | ~33.1–47.6 t/s | ~532–1100 t/s | 32K | Fits | Estimated |
| Granite 4.2 30B IBM · 29.277B | Q4_K_Mrecommended | 20.5 GB | ~31.4–45.2 t/s | ~504–1050 t/s | 8K | Borderline | Estimated |
Rows in grey are estimates from our bandwidth model, not measurements — they are shown as a range and never as a precise figure. Use the “measured only” filter to see just the 1 pairing on this machine that a real benchmark backs.
Submit a benchmarkContributions are reviewed before publication.
Ownership economicsUnited States (federal) · C corporation · 8h/day
Monthly economic cost
$26
Calculated after tax
Codex/Claude Code
$100/mo
≈ $100/mo · local is $74 less
Net cash at purchase
$1,981
Calculated VAT not reclaimable
Total over 5 years
$1,578
Calculated after tax, after resale
Cost per USD/1M tokens
$0.80
Calculated 32.9M tokens/month
The $100 comparison uses the Codex Pro 5x / Claude Max 5x plans. A fixed planning conversion is used for USD. This compares monthly spend only: subscriptions have usage limits, local hardware has different capabilities and constraints, and taxes or regional pricing may change the charged amount. Prices checked 7 September 2026.
Purchase-price input: $1,981 in United States (federal), tax/VAT excluded · estimated · Used market exact-match reference (converted catalogue estimate). This is the localized purchase input; the after-tax economic cost is calculated separately below.
Monthly breakdown
| Depreciation 1,545 over 5 years, straight-line to a 436 residual | $25.75 |
| Electricity 31.3 kWh/month at 0.140/kWh | $4.38 |
| Cost of capital 4.0%/yr on 1,208 average capital employed | $4.03 |
| Monthly cost before tax | $34.16 |
| Electricity tax shield Running costs are deductible business expenses | −$0.92 |
| First-year expensing §179 (100.0%) | −$6.93 |
| Monthly economic cost after tax | $26.30 |
Three different numbers, deliberately
Cash cost
$1,981
Money that leaves the bank account on day one, net of reclaimable VAT.
Accounting depreciation
$25.75/month
$1,545 written down over 5 years to a $436 residual.
After-tax economic cost
$26.30/month
Depreciation plus running costs plus cost of capital, less the tax those deductions save. This is the figure to compare between machines.
Assumptions and sources (verified 2026-09-07)
VAT rate
0% Official spec
VAT recoverable
0% Official spec
Federal C-corporation estimate at the flat 21% rate. Pass-through entities should use the sole-proprietor estimate as a rougher proxy.
Effective deduction rate
21.00% Calculated
Headline marginal rate 21.00%.
Depreciation
5 years, straight-line Assumption
Residual value
$436 (22%) Assumption
Extrapolated.
Electricity
$0.140/kWh Assumption
Average power draw
178 W Calculated
Load 600 W for 20% of powered hours, idle 72 W for the rest — a machine that is on is not generating tokens the whole time.
Investment allowances
§179 100.0% Official spec
Worth $416 in total — first-year expensing that replaces later tax depreciation.
Cost of capital
$4.03/month Assumption
- VAT rate: No US federal VAT · verified 2026-09-07
- Marginal tax rate: IRS Publication 542 — Corporations · verified 2026-09-07
- VAT recoverable fraction: site assumption · verified 2026-09-07
- Useful life: IRS Publication 946 — How To Depreciate Property · verified 2026-09-07
- Electricity price: Site assumption · verified 2026-09-07
Assumes the machine generates tokens 20% of its 176 powered hours per month. Cost per token scales inversely with this number — halve the utilisation and the cost per token doubles.
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.