Best AI Models for AMD Radeon RX 6600 XT (8 GB)

Runs 7–9B models well; 14B doesn't fit in 8 GB.

8 GB GDDR6256 GB/s21 TFLOPS FP16160 WRDNA 2 2021

8 GB at 256 GB/s fits ~7-8B Q4 models, no more. Not on AMD's official ROCm list; the Vulkan backend (llama.cpp, LM Studio) is the easy path.

What LLMs can the RX 6600 XT run?

#	Model	Speed	Quant · VRAM
1	Qwen3.5 9BAlibabaHow to run → Q4_K_M · 6.6 GB · 24.2 t/s	24.2 tok/s	Q4_K_M · 6.6 GB
2	Qwen3.5 4BAlibaba Q4_K_M · 3.4 GB · 47.1 t/s	47.1 tok/s	Q4_K_M · 3.4 GB
3	Gemma 2 9B ITGoogle Q4_K_M · 7.3 GB · 25.2 t/s	25.2 tok/s	Q4_K_M · 7.3 GB
4	Gemma 3 4B ITGoogle Q4_K_M · 5.0 GB · 54.1 t/s	54.1 tok/s	Q4_K_M · 5.0 GB
5	Ling 3.0 TinyInclusion AI Q4_K_M · 5.5 GB · 91.9 t/s	91.9 tok/s	Q4_K_M · 5.5 GB

#	Model	Speed	Reasoning Score	Quant · VRAM
1	Qwen3.5 9BAlibabaHow to run → Q4_K_M · 6.6 GB · 24.2 t/s	24.2 tok/s		Q4_K_M · 6.6 GB
2	Gemma 3 4B ITGoogle Q4_K_M · 5.0 GB · 54.1 t/s	54.1 tok/s		Q4_K_M · 5.0 GB
3	Qwen2.5 7B InstructAlibaba Q4_K_M · 5.8 GB · 30.8 t/s	30.8 tok/s		Q4_K_M · 5.8 GB
4	Gemma 2 9B ITGoogle Q4_K_M · 7.3 GB · 25.2 t/s	25.2 tok/s	overall	Q4_K_M · 7.3 GB
5	Ling 3.0 TinyInclusion AI Q4_K_M · 5.5 GB · 91.9 t/s	91.9 tok/s		Q4_K_M · 5.5 GB

#	Model	Speed	Quant · VRAM
1	Qwen3.5 4BAlibabaHow to run → Q4_K_M · 3.4 GB · 47.1 t/s	47.1 tok/s	Q4_K_M · 3.4 GB
2	Qwen3.5 9BAlibaba Q4_K_M · 6.6 GB · 24.2 t/s	24.2 tok/s	Q4_K_M · 6.6 GB
3	Gemma 4 E4B ITGoogle Q4_K_M · 5.6 GB · 28.9 t/s	28.9 tok/s	Q4_K_M · 5.6 GB
4	Ling 3.0 TinyInclusion AI Q4_K_M · 5.5 GB · 91.9 t/s	91.9 tok/s	Q4_K_M · 5.5 GB
5	Spark X2.6 4BXHToken Q4_K_M · 4.3 GB · 51.9 t/s	51.9 tok/s	Q4_K_M · 4.3 GB

#	Model	Speed ↓	Quant · VRAM
1	Qwen3.5 4BAlibabaHow to run → Q4_K_M · 3.4 GB · 47.1 t/s	47.1 tok/s	Q4_K_M · 3.4 GB
2	Ling 3.0 TinyInclusion AI Q4_K_M · 5.5 GB · 91.9 t/s	91.9 tok/s	Q4_K_M · 5.5 GB
3	Gemma 4 E4B ITGoogle Q4_K_M · 5.6 GB · 28.9 t/s	28.9 tok/s	Q4_K_M · 5.6 GB
4	MiMo V2.6 Distill Qwen 9BXiaomi Q4_K_M · 6.5 GB · 24.7 t/s	24.7 tok/s	Q4_K_M · 6.5 GB
5	Qwen3.5 9BAlibaba Q4_K_M · 6.6 GB · 24.2 t/s	24.2 tok/s	Q4_K_M · 6.6 GB

#	Model	Speed	Quant · VRAM
1	Qwen3.5 9BAlibabaHow to run → Q4_K_M · 6.6 GB · 24.2 t/s	24.2 tok/s	Q4_K_M · 6.6 GB
2	Qwen3.5 4BAlibaba Q4_K_M · 3.4 GB · 47.1 t/s	47.1 tok/s	Q4_K_M · 3.4 GB
3	Gemma 3 4B ITGoogle Q4_K_M · 5.0 GB · 54.1 t/s	54.1 tok/s	Q4_K_M · 5.0 GB
4	MiMo V2.6 Distill Qwen 9BXiaomi Q4_K_M · 6.5 GB · 24.7 t/s	24.7 tok/s	Q4_K_M · 6.5 GB
5	MiniCPM V 4.7 1BOpenBMB Q4_K_M · 1.6 GB · 120 t/s	120 tok/s	Q4_K_M · 1.6 GB

See all 218 models on the RX 6600 XT →Best quant that fits · speeds estimated on this card

About the RX 6600 XT

The RX 6600 XT is an entry card in the 8 GB class: it runs 7–9B models well. It is power-hungry for its speed, and fair value at ≈$245 used. RDNA 2 generation, released 2021.

Speed in 8 GB#18256 GB/s

Per watt#190.15 tok/s per W on Qwen3.5 9B (9B params)

Per dollar#39.9 tok/s per $100 on Qwen3.5 9B (9B params)

GenerationRDNA 2released 2021

RX 6600 XT strengths and weaknesses

Strengths

Runs 7–9B models: Qwen3.5 9B at 24.2 tok/s in 6.6 GB

Weaknesses

14B models don't fit: Qwen3 14B needs 11.9 GB at Q4 vs 8 GB here
Little room for context: Qwen3.5 9B uses 6.6 of 8 GB, 1.4 GB left
Slow prompt reading: A 4K-token prompt on Qwen3.5 9B waits 16.9 s for the first token
ROCm, not CUDA: No FP8 weights; MXFP4 only through llama.cpp, not vLLM

Speed per dollar and per watt

NewUsed

On Qwen3.5 9B (9B params) at Q4_K_M. New prices are compared with new, used with used. The last two columns are the speed you get per $100 of price and per 100 W of board power; higher is better. The RX 6600 XT has no new price, so the New view shows it at its MSRP.

Card	New price	tok/s	tok/s per $100	tok/s per 100 W
RTX 50608 GBBest new value	about $460	45.8	10.0	31.6
RTX 507012 GB	about $840	68.7	8.2	27.5
RX 6600 XT8 GB	about $379	24.2	6.4	15.1
RTX 40608 GB	about $520	27.8	5.3	24.2

Card	Used price	tok/s	tok/s per $100	tok/s per 100 W
RTX 3060 12GB12 GB	about $329	36.8	11.2	21.6
RTX 50608 GBBest used value	about $430	45.8	10.7	31.6
RX 6600 XT8 GB	about $245	24.2	9.9	15.1
RTX 407012 GB	about $575	51.5	9.0	25.8
RTX 40608 GB	about $335	27.8	8.3	24.2
RTX 4070 SUPER12 GB	about $675	51.5	7.6	23.4
RTX 4060 Ti 8GB8 GB	about $400	29.4	7.4	18.4
RTX 4070 Ti12 GB	about $722	51.5	7.1	18.1

Similar GPUs

Cards people weigh against the RX 6600 XT, each with the one reason it is worth a look. Speeds on Qwen3.5 9B.

22% faster, same 8 GBRTX 4060 Ti 8GBNVIDIA · 8 GB · Ada Lovelace

▲ 22% speedsame 8 GB$399rent $0.15/hr

4 GB more and 52% fasterRTX 3060 12GBNVIDIA · 12 GB · Ampere

▲ 52% speed▲ 4 GB$329rent $0.07/hr

Same 8 GB, new with warrantyRTX 5060NVIDIA · 8 GB · Blackwell

▲ 89% speedsame 8 GB$460

4 GB more and 69% fasterRX 9070 GREAMD · 12 GB · RDNA 4

▲ 69% speed▲ 4 GB$549

67% faster, same 8 GBA580Intel · 8 GB · Alchemist

▲ 67% speedsame 8 GB$179

8 GB more and 3.0× the speedRTX 4080NVIDIA · 16 GB · Ada Lovelace

▲ 203% speed▲ 8 GB$1,199rent $0.26/hr

RX 6600 XT tokens per second by model size

Output speed depends on memory bandwidth (256 GB/s). Grey rows need more than 8 GB.

9BQwen3.5 9B · Q4_K_M · 6.6 GB
24.2tok/s
14BQwen3 14B · not at 4-bit
needs 11.9 GB
27–31BQwen3.8 27B · not at 4-bit
needs 17.9 GB
35B MoEQwen3.6 35B A3B · not at 4-bit
needs 22.0 GB
70BLlama 3.3 70B Instruct · not at 4-bit
needs 51.3 GB
120B MoEGPT OSS 120B · not at 4-bit
needs 70.8 GB

Estimated speeds: Q4_K_M, 4K context, one user. How we estimate

All 842 models on the RX 6600 XT

Featured only

Best quant that fits, ordered by llmrun Score. Fit grades how well it runs here, S best. How ranking works

LLM models compatible with AMD Radeon RX 6600 XT — ranked by Score, recency and Fit
Model	Quant	VRAM	Speed	Context	Fit
DeepSeek R1 Distill Qwen 1.5B1.5BChatReasoning Q4_K_M·155.2 t/s	Q4_K_M	2.6 GB33%	155.2 t/s	—	S97, Runs great
Qwen3.5 4B Base4.7BVision Q4_K_M·47.1 t/s	Q4_K_M	3.4 GB43%	47.1 t/s	262K	A78, Runs well
Phi Tiny MoE Instruct3.8BChat Q4_K_M·78.7 t/s	Q4_K_M	3.1 GB39%	78.7 t/s	4K	S87, Runs great
VibeThinker 1.5B1.8BChatMathCode Q4_K_M·108.2 t/s	Q4_K_M	1.8 GB23%	108.2 t/s	131K	S93, Runs great
Gemma 3 270M IT Heretic268MChat Q4_K_M·320.0 t/s	Q4_K_M	0.5 GB6%	320.0 t/s	33K	S100, Runs great
Ilama 3.2 1B1.2BChat BF16·54.1 t/s	BF16	3.3 GB41%	54.1 t/s	131K	A81, Runs well
HunyuanOCR1.1BVision Q4_K_M·143.6 t/s	Q4_K_M	1.8 GB22%	143.6 t/s	131K	S96, Runs great
InternVL2 2B2.2BVision Q4_K_M·105.2 t/s	Q4_K_M	3.3 GB41%	105.2 t/s	—	S92, Runs great
AesCode 8B8.8BVisionCodeFunctions Q4_K_M·26.2 t/s	Q4_K_M	8.0 GB100%	26.2 t/s	262K	C35, Usable
DeepSeek R1 Distill Qwen 1.5B1.8BChatReasoningFunctions Q4_K_M·108.2 t/s	Q4_K_M	1.8 GB23%	108.2 t/s	131K	S93, Runs great
OLMoE 1B 7B 0125 Instruct6.9BChat Q4_K_M·112.4 t/s	Q4_K_M	5.0 GB62%	112.4 t/s	4K	S94, Runs great
Vaultgemma 1B1.0BChat BF16·67.1 t/s	BF16	3.7 GB47%	67.1 t/s	—	S85, Runs great
OLMo 2 0425 1B Instruct1.5BChat Q4_K_M·105.2 t/s	Q4_K_M	1.7 GB22%	105.2 t/s	4K	S92, Runs great
Turkish Gemma 4B T1 Scout4.3BChatFunctionsReasoning Q4_K_M·47.4 t/s	Q4_K_M	3.6 GB45%	47.4 t/s	131K	A79, Runs well
Apertus V1.5 8B8.9BVision Q3_K_M·32.2 t/s	Q3_K_M	7.4 GB93%	32.2 t/s	—	B52, Decent

RX 6600 XT specs, power and PSU

Specs

Architecture: RDNA 2
VRAM: 8 GB GDDR6
Memory bandwidth: 256.0 GB/s
FP16 (dense): 21.21 TFLOPS
Stream processors: 2,048
TDP: 160 W
Released: 2021-08-11
MSRP: $379

RX 6600 XT FAQ

Is the RX 6600 XT still worth it in 2026?

At ≈$245 used you get 9.9 tok/s per $100 on Qwen3.5 9B, which ranks 3rd of the 8 cards compared here; it is also the 18th fastest out of 20 cards with 8 GB. It runs 7–9B models well; 14B doesn't fit in 8 GB.

What is the largest model the RX 6600 XT can run?

Qwen3.5 9B (9.7B) is the largest at 4-bit or better: at Q4_K_M it uses 6.6 GB of 8 GB, and runs at about 24.2 tok/s.

Can the RX 6600 XT run 14B models?

No. Qwen3 14B needs 11.9 GB at Q4, more than the 8 GB on this card.

How many tokens per second does the RX 6600 XT give?

About 24.2 tok/s on Qwen3.5 9B at Q4_K_M, with the first token after 16.9 s on a 4K-token prompt.

What power supply does the RX 6600 XT need?

Plan a 350 W PSU (2× the 160 W TDP).

Is renting cheaper than buying an RX 6600 XT?

An RTX 3090 (24 GB) rents from $0.18/hr. Renting costs as much as buying after ≈1,300 hours (≈0.9 years at 4 h a day).

Best coding LLMs 8 GB VRAM 12 GB VRAM GPUs with 8 GB or more RTX 5080 RTX 3080 Ti