Best GPUs for this CPU, bottleneck check, and compatible graphics cards
Core i5-6400 / Intel made / 6th Gen / Released 2016 Also known as: i5-6400 / Corei5-6400
Core i5-6400 (Intel, released in 2016, also listed as i5-6400 / Corei5-6400) is a CPU with a performance score of 6,500, 4C / 4T, TDP 65W. If GPU compatibility and performance balance are poor, a Bottleneck occurs, preventing the GPU or CPU from reaching its full potential. In our estimate, the GPU that pairs best with Core i5-6400 is GeForce GTX 1650 (estimated bottleneck: about 0%). Below are the top 10 compatible GPUs and a guide to GPUs to avoid.
GPUs are ordered by proximity to the ideal CPU:GPU ratio of 0.9:1. A lower bottleneck percentage means the combination can use more of its performance.
If you want higher graphics settings or plan to keep the PC for years, you can pick a GPU one step stronger. Core i5-6400 will fall slightly behind (a bottleneck of 10% or less), but a later CPU upgrade will let the GPU run at full strength.
The Bottleneck Checker opens with Core i5-6400 already selected.
Core i5-6400 (i5-6400 / Corei5-6400) has a performance score of 6,500 points. Using the same CPU:GPU ≈ 0.9:1 standard as the checker, compatibility by GPU score is shown below.
| GPU Score to Pair | Rating | What It Means |
|---|---|---|
| Below 4,815 points | GPU Too Weak | The GPU is too weak for this CPU. Some of Core i5-6400 performance remains unused (e.g., GeForce GTX 1050、Radeon R9 280、GeForce GTX 760) |
| 4,815–8,025 points | Great Match: 10% or Less | Optimal balance. Both CPU and GPU can deliver nearly full performance (ideal: about 7,222 pts) |
| 8,025–9,630 points | Acceptable: 10–25% | The GPU is somewhat strong. This is practical, but the CPU may hold it back under heavy load. |
| Over 9,630 points | CPU Bottleneck: Over 25% | The GPU is too powerful for Core i5-6400 to use fully (e.g., GeForce GTX 1660、GeForce GTX 980 Ti、Intel Arc A580 8GB、GeForce GTX 1660 SUPER) |
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.
Check each store for current prices and stock (search for Core i5-6400).
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These CPUs have similar performance scores and may be useful replacement or comparison candidates.
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→ Compare Other Models / → Check Whether an Upgrade Is Worthwhile
Our estimate finds that GeForce GTX 1650 offers the best balance, with an estimated bottleneck of about 0%. A CPU-to-GPU performance ratio near 0.9:1 tends to use both parts effectively. See the top 10 compatible GPUs in the table on this page.
Pairing Core i5-6400 with a powerful GPU scoring over 9,630 points (for example, GeForce GTX 1660、GeForce GTX 980 Ti、Intel Arc A580 8GB、GeForce GTX 1660 SUPER) is likely to create a CPU bottleneck above 25%.Conversely, a GPU below 4,815 points（例: GeForce GTX 1050、Radeon R9 280、GeForce GTX 760） leaves some of Core i5-6400 performance unused.
Core i5-6400 has 4 cores and 4 threads.Its base clock is 2.7GHz and maximum boost clock is 3.3GHz.The socket is LGA1151.
Core i5-6400 has a TDP of 65W. As a guideline, choose a power supply that covers the CPU TDP plus GPU power draw, with additional headroom.
Its performance score is 6,500 points. CPU–GPU balance matters for games, while core count (4C / 4T) matters for video editing and AI preprocessing. Check the top 10 GPUs above for your use case. GPU VRAM is the main factor for running generative AI, so also see each GPU detail page.
