Can I run it?
Can I run Sharp Spark X2.5 4B on GeForce RTX 5080?
Runs great
Runs great fully on your GeForce RTX 5080 at Q6_K, 8K context, about 110–149 tok/s. Weights 3.36 GB plus 0.33 GB of KV cache — 4.03 GB of 14.7 GB usable. Up to 256K context still fits.
Best quantQ6_K
Working context8K
Max that fits256K
Speed110–149 tok/s
Weights3.36 GB
KV cache0.33 GB
Total4.03 GB
Usable14.7 GB
Sharp Spark X2.5 4B details · GeForce RTX 5080 page · How this estimate is made
Run commands
llama.cpp
llama-server -hf peculiar-ragdoll/Sharp-Spark-X2.5-4B-GGUF:Q6_K -c 8192 -ngl 36
No matching name in the Ollama library snapshot.
LM Studio
lms get peculiar-ragdoll/Sharp-Spark-X2.5-4B-GGUF # Then load quant Q6_K
Assumptions
- Estimate, not a benchmark. Decode speed uses a memory-bandwidth model at 55–75% of peak.
- KV cache is FP16. Engine overhead assumes llama.cpp (0.3 GB + 1% of the weights). Ollama is closer to 0.9 GB + 3%, LM Studio closer to 1 GB + 3%.
- Q6_K size is the real GGUF file size from Hugging Face.
- 0.5 GB is reserved because this GPU also drives a display, then 5% of the rest is left free.
- Speed is quoted at 8K context, not at the maximum context that still fits.
Larger models that also fit
- Can I run Qwen3.8 27B on GeForce RTX 5080? — Tight fit, UD-IQ4_XS, 36–49 tok/s
- Can I run gemma 4 12b it on GeForce RTX 5080? — Tight fit, UD-Q8_K_XL, 31–43 tok/s
- Can I run Qwen3.5 9B on GeForce RTX 5080? — Tight fit, UD-Q8_K_XL, 40–54 tok/s
Updated 2026-10-24. Profile on this page is the device default plus 32 GB of DDR5-5600 system RAM.