CPU bottleneck check, compatible CPUs, and AI models it can run
GeForce GTX 660 / NVIDIA made / GTX 600 / Released 2012 Also known as: GTX660 / 660
GeForce GTX 660 (NVIDIA, released in 2012, also listed as GTX660 / 660) is a graphics card with a performance score of 3,500 and 2GB of VRAM, TDP 140W. If CPU compatibility and performance balance are poor, a CPU bottleneck occurs, preventing GTX 660 from reaching its full potential. In our estimate, the CPUs that pair best with GTX 660 are Intel: Core i3-2120 (estimated bottleneck: about 0%), and AMD: AMD A6-7470K (about 0%). Below are the top 10 compatible CPUs, CPUs to avoid, and generative AI models supported by this amount of VRAM.
CPUs are ordered by proximity to the ideal CPU:GPU ratio of 0.9:1. A lower bottleneck percentage means more of the GPU’s performance can be used.
The Bottleneck Checker opens with GeForce GTX 660 already selected.
GTX 660 (GTX660 / 660) has a performance score of 3,500 points. Using the same CPU:GPU ≈ 0.9:1 standard as the checker, compatibility by CPU score is shown below.
| Example CPUs to Pair | Rating | What It Means |
|---|---|---|
| AMD Phenom II X4 945、Core i3-3240、Core 2 Extreme QX9775 | Great Match: 10% or Less | Optimal balance. Nearly all of GTX 660 performance can be used |
| AMD Athlon II X3 445、Core i3-540、AMD Phenom II X2 560 | Acceptable: 10–25% | Practical with no major issue. Consider a future upgrade if targeting high fps. |
| AMD Athlon II X2 260、Core 2 Quad Q9450、Core 2 Quad Q6700 | CPU Too Weak: Over 25% | A clear CPU bottleneck. Much of the GPU performance is wasted |
| Core i3-4170、Core i5-2300、Core i7-860 | CPU Overkill | Likely overkill for gaming |
Note: Perceived results vary by resolution and game (GPU matters more at 4K, while CPU matters more at high-fps Full HD). For an exact estimate, use the Bottleneck Checker.
Runs Comfortably: Meets recommended VRAM / Barely Runs: Meets minimum VRAM (lower quality or quantization may be needed)
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→ Compare Other Models / → Check Whether an Upgrade Is Worthwhile
In our estimate, the best-balanced options are Core i3-2120 for Intel (estimated bottleneck: about 0%) and AMD A6-7470K for AMD (about 0%). A CPU-to-GPU performance ratio near 0.9:1 tends to use both parts effectively. See the top 10 compatible CPUs in the table on this page.
As a guide, CPUs such as AMD Athlon II X2 260、Core 2 Quad Q9450、Core 2 Quad Q6700、Core 2 Duo E8600 push the bottleneck above 25% and waste much of the GeForce GTX 660 performance. On the other hand, CPUs such as Core i3-4170、Core i5-2300、Core i7-860 are likely overkill for gaming.
GeForce GTX 660 has 2GB of VRAM. It can comfortably run about 4 models, including Stable Diffusion and LLMs (for example, Qwen 2.5 0.5B (Q4), Whisper Tiny, Whisper Base).
GeForce GTX 660 has a power draw (TDP) of 140W. Choose a power supply that covers the GPU TDP plus CPU and other component power draw, with additional headroom. Check the actual CPU pairing balance in the bottleneck diagnosis above.
Its performance score is 3,500 points. CPU balance matters for gaming, while VRAM (2GB) matters for generative AI. Use the top 10 CPU list and AI model list above to check your use case.
