NVIDIA RTX 5070 vs NVIDIA GTX 1660 Super
Which graphics card is better for running local language models? Here is how the NVIDIA RTX 5070 (12 GB) compares against the NVIDIA GTX 1660 Super (6 GB) in real memory headroom, supported model architectures, and generation speed.
NVIDIA · Blackwell
12 GB VRAM
NVIDIA RTX 5070
- Memory Bandwidth: 672 GB/s (GDDR7 192-bit)
- Fits fully in VRAM: 33 popular models
- Power Draw (TDP): 250W
- Largest recommended (Q4): 14B
NVIDIA · Desktop
6 GB VRAM
NVIDIA GTX 1660 Super
- Memory Bandwidth: 192 GB/s (GDDR6)
- Fits fully in VRAM: 24 popular models
- Power Draw (TDP): 150W
- Largest recommended (Q4): <4B
The AI Local Check Verdict: Which GPU should you buy for AI?
The NVIDIA RTX 5070 is the clear winner for local AI. It provides both 6 GB more VRAM and higher memory bandwidth (672 GB/s vs 192 GB/s).
This allows it to run larger model architectures entirely in video memory while also delivering faster token generation speeds on models of all sizes.
Models that fit on NVIDIA RTX 5070, but NOT on NVIDIA GTX 1660 Super
These models run entirely in GPU VRAM on the NVIDIA RTX 5070, but require slow system RAM offload on the NVIDIA GTX 1660 Super:
| Model | Size | Downloads | NVIDIA RTX 5070 | NVIDIA GTX 1660 Super |
|---|---|---|---|---|
| unsloth/Qwen3-Coder-30B-A3B-Instruct-GGUF | 30.53B | 10,762,547 | Fits in VRAM | Offload (Slow) |
| unsloth/gpt-oss-20b-GGUF | 20.91B | 501,909 | Fits in VRAM | Offload (Slow) |
| Qwen/Qwen3-8B-GGUF | 8.19B | 498,793 | Fits in VRAM | Offload (Slow) |
| bartowski/DeepSeek-Coder-V2-Lite-Instruct-GGUF | 15.71B | 454,533 | Fits in VRAM | Offload (Slow) |
| unsloth/Qwen-AgentWorld-35B-A3B-GGUF | 34.66B | 373,970 | Fits in VRAM | Offload (Slow) |
| bartowski/Kwaipilot_KAT-Coder-V2.5-Dev-GGUF | 34.66B | 360,510 | Fits in VRAM | Offload (Slow) |
| MaziyarPanahi/Qwen3-14B-GGUF | 14.77B | 271,982 | Fits in VRAM | Offload (Slow) |
| MaziyarPanahi/Qwen3-30B-A3B-GGUF | 30.53B | 260,445 | Fits in VRAM | Offload (Slow) |
| bartowski/Qwen2.5-32B-Instruct-GGUF | 32.76B | 216,296 | Fits in VRAM | Offload (Slow) |
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