Ryzen 9 3900X vs Ryzen 7 3700X

The Ryzen 9 3900X is about 10% faster at 1440p. Whether that is worth it depends on the rest of your build.

The gap changes with resolution.

CPU differences shrink as resolution rises — at 4K the graphics card does most of the work.

In a real build with a RTX 3080.

Specs alone don’t tell you which to buy. Here is what each one does when it’s actually paired up, at 1440p.

So which should you buy?

The Ryzen 9 3900X is faster, but the Ryzen 7 3700X is the better buy per dollar. Take the Ryzen 9 3900X only if you want the extra headroom and the price gap doesn't bother you.

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Common questions.

Straight answers on the Ryzen 9 3900X versus the Ryzen 7 3700X.

• Is the Ryzen 9 3900X better than the Ryzen 7 3700X?

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  Yes, but by less than the spec sheet suggests. At 1440p the Ryzen 9 3900X scores 66 against 60 for the Ryzen 7 3700X — roughly 10% faster. It also costs about $170 more at MSRP, so the question is whether that gap is worth the money for your build.

• Does the Ryzen 9 3900X or Ryzen 7 3700X bottleneck a RTX 3080?

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  Paired with a RTX 3080 at 1440p, the Ryzen 9 3900X build comes out 0% CPU-bound, and the Ryzen 7 3700X build comes out 3% CPU-bound. Being GPU-bound is the healthy outcome — it means the graphics card is the part working hardest.

• Is it worth upgrading from the Ryzen 7 3700X to the Ryzen 9 3900X?

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  Only if you are also lifting the rest of the build. The Ryzen 9 3900X is about 10% ahead at 1440p, and gaps like that shrink further at 4K where the GPU does more of the work. If you are upgrading from the Ryzen 7 3700X purely for frames, check the pairing first.

• Which is better value, the Ryzen 9 3900X or the Ryzen 7 3700X?

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  On performance per dollar at MSRP, the Ryzen 7 3700X wins. The Ryzen 9 3900X lists at $499 for an index of 66, and the Ryzen 7 3700X at $329 for 60.