Core i7-9700K vs Phenom II X3 720

The Core i7-9700K packs 8 cores / 8 threads, while the Phenom II X3 720 offers 3 cores / 3 threads — the Core i7-9700K has 5 more cores. Boost clocks reach 4.9 GHz on the Core i7-9700K versus 2.8 GHz on the Phenom II X3 720 — a 54.5% clock advantage for the Core i7-9700K (base: 3.6 GHz vs 2.8 GHz). The Core i7-9700K uses the Coffee Lake-R (2018−2019) architecture (14 nm), while the Phenom II X3 720 uses Heka (2009−2010) (45 nm). In PassMark, the Core i7-9700K scores 14,397 against the Phenom II X3 720's 1,600 — a 160% lead for the Core i7-9700K. L3 cache: 12 MB (total) on the Core i7-9700K vs 6 MB (total) on the Phenom II X3 720.

The Core i7-9700K uses the LGA1151 socket (PCIe 3.0), while the Phenom II X3 720 uses AM3 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2666 on the Core i7-9700K versus DDR3-1333 on the Phenom II X3 720 — the Core i7-9700K supports 100% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i7-9700K supports up to 128 GB of RAM compared to 16 GB — 700% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes. Chipset compatibility: Intel 300 series (Core i7-9700K) and AM3,AM2+ (Phenom II X3 720).

Both processors feature an unlocked multiplier for overclocking. Virtualization support: VT-x, VT-d (Core i7-9700K) vs AMD-V (Phenom II X3 720). The Core i7-9700K includes integrated graphics (UHD Graphics 630), while the Phenom II X3 720 requires a dedicated GPU. Primary use case: Core i7-9700K targets Desktop, Phenom II X3 720 targets Legacy Desktop.

At launch, the Core i7-9700K was priced at $385, while the Phenom II X3 720 came in at $130. On launch pricing ($385 vs $130), Phenom II X3 720 was $255 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i7-9700K delivers 37.4 pts/$ vs 12.3 pts/$ for the Phenom II X3 720 — making the Core i7-9700K the 100.9% better value option.

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