Verdict: The Ryzen 7 9800X3D is the better gaming CPU; the Core i9-14900K wins in heavily multi-threaded professional workloads at a lower current price.
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Winner: AMD Ryzen 7 9800X3D
Spec-by-spec comparison
AMD Ryzen 7 9800X3D
Intel Core I9 14900K
Cores
8 P-cores (Zen 5)
8P + 16E (Raptor Lake)
L3 Cache
~104MB (V-Cache)
32MB
Gaming Lead
+20-30% CPU-limited
Baseline
Blender/Encode
Baseline
+30-35%
Gaming Power Draw
~120W
~175W gaming
Platform
AM5 (current gen)
LGA1700 (end-of-life)
AMD Ryzen 7 9800X3D
What works
Best gaming CPU under $500 — V-Cache advantage over any 24-core Raptor Lake chip
Lower power draw (~120W gaming) vs 14900K's up to 253W peak
AM5 platform with longer upgrade path than LGA1700