NVIDIA · workstation

RTX A4500

RTX A4500 has 20 GB of VRAM at 640 GB/s — about 18.60 GiB usable after driver and compositor overhead. 1945 of 2118 indexed models fit at 16K context with q4_0 KV.

Spec sheet· bandwidth, theoreticalFrom the file· fit from summed bytesPredicted· speed
Memory
20 GB
GDDR6
Bandwidth
640 GB/s
320-bit bus
Tensor FP16
95 TF
dense
TDP
200 W
KV cachef16q8_0q4_0quantizing the KV cache is a ~2× lever on the dominant term at long context
text 1668vision language 173video 16audio asr 39image 2audio tts 21embedding 26

What fits at 16K context

largest quantization that fits, per model · 1945 of 2118 indexed
ModelBest quantParamsWeightsKVTotal in memoryHeadroomtok/s
Gemma-4-Gembrain-X-Core-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-Gembrain-X-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-31B-Isometry-Fabled-PersonaI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Versipellis-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma4-Gutenberg-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
G4-MeroMero-31B-uncensored-hereticI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-Novelist-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Wanabi-Gemma4-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
G4-Alice-v1.2-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Agares-31B-v1I1-Q4_030.7B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma4-Gutenberg-31B-HereticI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-Ortenzya-The-Creative-Wordsmith-31B-it-uncensored-hereticI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-Gemsicle-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-Gembrain-31B-it-uncensored-hereticI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Melinoe-Gemma4-31B-VL-hereticI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
G4-MeroMero-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Glistening-Gem-31B-v1.0I1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Melinoe-Gemma4-31B-VLI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-31B-Storymaxxed3I1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Huihui-gemma-4-31B-it-qat-q4_0-unquantized-abliteratedI1-Q4_032.7B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-Queen-it-qat-q4_0-unquantizedI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-it-qat-q4_0-unquantized-hereticI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-AssGuard-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
copywriter-gemma4-31bI1-Q4_032.7B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-heretic-finetuneI1-Q4_030.7B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-Garnet-V2-31B-it-ultra-uncensored-hereticI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-it-abliterated-v3I1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-it-noloopI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Webs-Sejong-31B-v7I1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Lilith-31B-v1.0I1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
JGOS-31B-ThinkI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-MergemaxxedI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
K1-v6-zeroI1-Q4_032.7B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-Queen-31B-it-uncensored-hereticI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-Sphinsikus-Chronist-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-it-hereticI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma4-31B-Finetuned-V2I1-Q4_032.7B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-31B-storymaxxedI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-31B-storymaxxed2I1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-it-Grand-Horror-X-INTENSE-HERETIC-UNCENSORED-ThinkingI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-it-Mystery-Fine-Tune-HERETIC-UNCENSORED-ThinkingI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-it-The-DECKARD-HERETIC-UNCENSORED-ThinkingI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Huihui-gemma-4-31B-it-abliterated-v2I1-Q4_032.7B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-Queen-31B-itI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-it-abliteratedI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31b-it-heretic-araI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Monika-31BI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Gemma-4-31B-Fable-CoderI1-Q4_032.7B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31B-anthologyI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
Omni-31B-Turkish-Reasoning-ModelI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31b-kairosI1-Q4_031.3B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
gemma-4-31BI1-Q4_032.7B16.49 GiB1.03 GiB18.60 GiB0.00 GiB21±22%
NVIDIA-Nemotron-Nano-9B-v2BF168.9B16.57 GiB0.98 GiB18.60 GiB0.00 GiB21±22%
openNemo-9B-abliteratedBF168.9B16.57 GiB0.98 GiB18.60 GiB0.00 GiB21±22%
command-r-35b-writer-v2I1-Q2_K_S35.0B11.86 GiB5.63 GiB18.59 GiB0.01 GiB21±22%
dolphin-2.6-mixtral-8x7bMoEI1-IQ3_XXS46.7B16.99 GiB0.56 GiB18.59 GiB0.01 GiB37±37%
xLAM-8x7b-rMoEIQ3_XXS46.7B16.99 GiB0.56 GiB18.59 GiB0.01 GiB37±37%
14BQ8_014.2B14.02 GiB3.52 GiB18.59 GiB0.01 GiB21±22%
EXAONE-4.0-32BQ4_032.0B16.96 GiB0.52 GiB18.58 GiB0.02 GiB21±22%
magnum-v2-32bIQ4_XS32.5B16.35 GiB1.13 GiB18.58 GiB0.02 GiB21±22%
From the filePredictedwhat these mean

Speed is modeled, not measured: decode is memory-bandwidth bound, so tokens per second is bytes read per token against achievable bandwidth. Mixture-of-experts models carry a wider band because only the routed experts are read each step, and few have been measured publicly.

Measured on this card

third-party benchmarks, aggregated
WorkloadMedianMiddle 50%Runs
Image generation15.27 it/s11.4118.32100
Prompt processing2862.73 tok/s2484.223293.5014
Text generation95.99 tok/s92.4596.8012
Benchmarked· n=100

Aggregated from community-submitted runs, so the spread is wide by nature — it covers different models, resolutions, step counts and settings, not one controlled configuration. Read the middle 50% rather than the median alone. These figures are reproduced with attribution from vladmandic-sd-data-benchmark, which publishes no licence — so we display and link rather than redistribute them.

Questions people ask

What AI models can a RTX A4500 run?
1945 of 2118 indexed open-weight models fit a RTX A4500 at 16,384 context with q4_0 KV cache, the largest being Gemma-4-Gembrain-X-Core-31B at I1-Q4_0. That covers text, vision-language, image, video and speech models.
How much usable memory does a RTX A4500 actually have?
Its nameplate is 20 GB, but about 18.60 GiB is available to a model once driver and compositor overhead is accounted for.
Is a RTX A4500 fast for local AI?
Its memory bandwidth is 640 GB/s, and that figure — not teraflops — is what governs token generation speed. Capacity decides what you can run; bandwidth decides how fast it runs.