Twenty times faster than real-time. A three-second audio clip finishes processing before you finish reading this sentence. The RTX 5080 pushes Whisper Large-v3 into territory where the bottleneck shifts from GPU compute to disk I/O and network throughput. Here is what we measured on GigaGPU.
Speed Metrics
| Metric | Value |
|---|---|
| Real-Time Factor (lower = faster) | 0.05 |
| Processing speed | 20.0x real-time |
| Audio hours processed per GPU-hour | 20.0 |
| Precision | FP16 |
| Performance rating | Excellent |
Benchmark conditions: FP16 inference, single-stream processing, 16kHz input audio, English language. faster-whisper backend with CTranslate2 optimisation.
VRAM Utilisation
| Component | VRAM |
|---|---|
| Model weights (FP16) | 3.1 GB |
| Audio buffer + runtime | ~0.5 GB |
| Total RTX 5080 VRAM | 16 GB |
| Free headroom | ~12.9 GB |
Whisper barely touches the 5080’s 16 GB. The 12.9 GB remainder is enough to co-host a full Stable Diffusion 1.5 pipeline (3.8 GB) or a 7B LLM for downstream processing. Blackwell’s memory bandwidth improvements help here too — multi-model setups experience less contention than on older architectures.
Running Costs
| Cost Metric | Value |
|---|---|
| Server cost | £0.95/hr (£189/mo) |
| Cost per audio hour | £0.048 |
| Audio hours per £1 | 20.8 |
Under five pence per audio hour. At 20x real-time, the 5080 can chew through 480 hours of audio per day — the equivalent output of a 60-person call centre. Compare against every GPU in the range on our benchmark page.
Where This Card Excels
Enterprise-scale transcription. Content platforms ingesting thousands of hours of user-generated audio. Research labs processing multilingual interview datasets. At 20x real-time and £0.048/hr, the 5080 is the price-performance leader for pure Whisper workloads. If absolute maximum throughput matters more than cost, the RTX 5090 hits 33.3x. Guidance: best GPU for Whisper.
Quick deploy:
docker run --gpus all -p 9000:9000 ghcr.io/fedirz/faster-whisper-server:latestSee: Whisper hosting guide, all benchmarks, Flux.1 hosting.
Deploy Whisper Large-v3 on RTX 5080
Order this exact configuration. UK datacenter, full root access.
Order RTX 5080 Server
