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Quick Answer
The 7800X3D is 5-12% faster than the 5800X3D in gaming depending on the title. However, upgrading requires a new motherboard and DDR5 RAM, costing $600-800 AUD total. For a 5-12% gaming gain, this is not worth it for most gamers.
At 8-12% improvement from a $590 net investment, you are paying roughly $75-85 per extra fps. Compare this to a GPU upgrade that typically costs $10-15 per extra fps. The platform upgrade is extremely poor value for pure gaming gains.
Our Verdict
Do not upgrade from the 5800X3D to the 7800X3D for gaming alone. The 5-12% improvement costs $590 net, which is terrible value. Wait for Zen 5 X3D where the jump will be larger, or invest in a GPU upgrade instead.
No, the Ryzen 7 5800X3D does not bottleneck the RTX 4080 at 1440p or 4K. The 3D V-Cache gives this AM4 CPU gaming performance that rivals Zen 4 chips. At 4K, it performs identically to the 7800X3D. At 1440p, expect only a 3-5% gap.
The Ryzen 7 7800X3D does not bottleneck the RTX 4090 at 1440p or 4K. In fact, the 7800X3D is the single best gaming CPU you can pair with the RTX 4090 thanks to its massive 96MB 3D V-Cache, which eliminates CPU-side frame drops.
No, do not upgrade from the 5800X3D to the 7800X3D for gaming. The 7800X3D is only 5-12% faster while requiring a new motherboard and DDR5 RAM ($590+ net cost). The 5800X3D remains one of the top gaming CPUs. Wait for Zen 5 X3D for a worthwhile jump.