Can I Run IBM Granite 4.2 on AMD Radeon RX 7900 XT?
Written by Jakub Rusinowski · Last updated September 11, 2026
Yes, comfortably — Granite 4.2 8B at Q4_K_M needs 6.8 GB at 8K context (4.8 GB weights + 2 GB KV cache/overhead), leaving ~13.2 GB of the AMD Radeon RX 7900 XT's 20 GB, at ~72 tok/s (est.), with room for up to 64K context.
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AMD Radeon RX 7900 XT Specs
| VRAM | 20 GB |
| Memory Bandwidth | 800 GB/s |
Granite 4.2 8B on the AMD Radeon RX 7900 XT: VRAM by quantization
| Quant | VRAM needed | Fits 20 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 17.9 GB | ✓ Yes | 16K | — |
| Q8_0 | 10.4 GB | ✓ Yes | 64K | — |
| Q6_K | 8.5 GB | ✓ Yes | 64K | — |
| Q5_K_M | 7.6 GB | ✓ Yes | 64K | — |
| Q4_K_M | 6.8 GB | ✓ Yes | 64K | — |
| Q3_K_M | 5.4 GB | ✓ Yes | 64K | — |
| Q2_K | 4.6 GB | ✓ Yes | 64K | — |
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 6.8 GB · 32K 10.2 GB · 128K 23.9 GB ✗. Past 128K 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 4.2 8B on 16 GB of system RAM, CPU only: runs.
IBM Granite 4.2 Sizes That Fit the AMD Radeon RX 7900 XT (at 8K context)
| Granite 4.2 8B | Q4_K_M · 6.8 GB at 8K context · ~72 tok/s (est.) |
| Granite 4.2 3B | Q4_K_M · 3.5 GB at 8K context · ~128 tok/s (est.) |
At 2 hrs/day, buying (~$899) beats renting at $0.34/hr after about 3.7 years.
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FAQ
Will IBM Granite 4.2 run on the AMD Radeon RX 7900 XT?
Yes, comfortably — Granite 4.2 8B at Q4_K_M needs 6.8 GB at 8K context (4.8 GB weights + 2 GB KV cache/overhead), leaving ~13.2 GB of the AMD Radeon RX 7900 XT's 20 GB, at ~72 tok/s (est.), with room for up to 64K context.
Which IBM Granite 4.2 variant fits best on the AMD Radeon RX 7900 XT?
Granite 4.2 8B at Q4_K_M quantization needs 6.8 GB at 8K context (4.8 GB weights + 2 GB KV cache/overhead), estimated ~72 tokens/sec, up to 64K context.
Every IBM Granite 4.2 size on the AMD Radeon RX 7900 XT
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Granite 4.2 30B | 20.7 GB | Runs at Q3_K_M | — |
| Granite 4.2 8B | 6.8 GB | Runs | ~72 tok/s |
| Granite 4.2 3B | 3.5 GB | Runs | ~128 tok/s |
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