Can I Run IBM Granite 4.0 on AMD Radeon RX 7900 XT?
Written by Jakub Rusinowski · Last updated August 15, 2026
Only with offload — Granite 4.0 Small-H 32B-A9B at Q4_K_M needs 22 GB at 8K context (19.3 GB weights + 2.7 GB KV cache/overhead) against the AMD Radeon RX 7900 XT's 20 GB, so part of it spills onto CPU/system RAM and speed drops sharply.
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AMD Radeon RX 7900 XT Specs
| VRAM | 20 GB |
| Memory Bandwidth | 800 GB/s |
Granite 4.0 Small-H 32B-A9B on the AMD Radeon RX 7900 XT: VRAM by quantization
| Quant | VRAM needed | Fits 20 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 66.6 GB | ✗ No | — | — |
| Q8_0 | 36.6 GB | ✗ No | — | — |
| Q6_K | 28.9 GB | ✗ No | — | — |
| Q5_K_M | 25.3 GB | ✗ No | — | — |
| Q4_K_M | 22 GB | ✗ No | — | — |
| Q3_K_M | 16.3 GB | ✓ Yes | 16K | — |
| Q2_K | 13.2 GB | ✓ Yes | 32K | — |
Assumes an 8K-token context with an f16 KV cache, on an estimated architecture — this model publishes no config we can read. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 20 GB. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Context costs VRAM too. At Q4_K_M on the AMD Radeon RX 7900 XT: 8K 22 GB ✗ · 32K 27.5 GB ✗ · 128K 49.6 GB ✗. Past 8K it no longer fits 20 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
No compatible GPU? Granite 4.0 Small-H 32B-A9B on 24 GB of system RAM, CPU only: runs.
Why It Does Not Fit
Every IBM Granite 4.0 variant requires more VRAM than the AMD Radeon RX 7900 XT provides (20 GB).
Nearest GPU That Fits
NVIDIA GeForce RTX 5090 Laptop GPU (24 GB VRAM).
IBM Granite 4.0 needs ~22 GB but this GPU has 20 GB. Rent a RTX 4090 (24 GB)-class GPU by the hour instead of buying one:
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FAQ
Is the AMD Radeon RX 7900 XT enough to run IBM Granite 4.0 locally?
Only with offload — Granite 4.0 Small-H 32B-A9B at Q4_K_M needs 22 GB at 8K context (19.3 GB weights + 2.7 GB KV cache/overhead) against the AMD Radeon RX 7900 XT's 20 GB, so part of it spills onto CPU/system RAM and speed drops sharply.
What's the cheapest GPU that runs IBM Granite 4.0?
The NVIDIA GeForce RTX 5090 Laptop GPU (24 GB VRAM) is the cheapest upgrade that fits it.
IBM Granite 4.0 on Other GPUs
- IBM Granite 4.0 on NVIDIA GeForce RTX 5080
- IBM Granite 4.0 on NVIDIA GeForce RTX 5070 Ti
- IBM Granite 4.0 on NVIDIA GeForce RTX 5060 Ti 16GB
- IBM Granite 4.0 on NVIDIA GeForce RTX 4090
- IBM Granite 4.0 on NVIDIA GeForce RTX 4080 Super
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VRAM Tier
Troubleshooting
- Ollama: "model requires more system memory than is available"
- Out of memory at long context (the KV cache, not the weights)
Buying Guide
← Can I Run It? | IBM Granite 4.0 Model Page | AMD Radeon RX 7900 XT GPU Page | VRAM calculator | Check Your Hardware