Phenom II X3 720 vs Athlon X2 QL-64

The Phenom II X3 720 packs 3 cores / 3 threads, while the Athlon X2 QL-64 offers 2 cores / 2 threads — the Phenom II X3 720 has 1 more core. Boost clocks reach 2.8 GHz on the Phenom II X3 720 versus 2.1 GHz on the Athlon X2 QL-64 — a 28.6% clock advantage for the Phenom II X3 720. The Phenom II X3 720 uses the Heka (2009−2010) architecture (45 nm), while the Athlon X2 QL-64 uses Lion (2008−2009) (65 nm). In PassMark, the Phenom II X3 720 scores 1,600 against the Athlon X2 QL-64's 1,614 — a 0.9% lead for the Athlon X2 QL-64. L3 cache: 6 MB (total) on the Phenom II X3 720 vs 0 kB on the Athlon X2 QL-64.

The Phenom II X3 720 uses the AM3 socket (PCIe 2.0), while the Athlon X2 QL-64 uses S1 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1333 on the Phenom II X3 720 versus DDR2-667 on the Athlon X2 QL-64 — the Phenom II X3 720 supports 40% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Phenom II X3 720 supports up to 16 GB of RAM compared to 8 GB — 66.7% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Phenom II X3 720) vs 0 (Athlon X2 QL-64) — the Phenom II X3 720 offers 16 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AM3,AM2+ (Phenom II X3 720) and Socket S1 (Athlon X2 QL-64).

Only the Phenom II X3 720 has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support AMD-V virtualization. Primary use case: Phenom II X3 720 targets Legacy Desktop.

The Phenom II X3 720 launched at $130 MSRP, while the Athlon X2 QL-64 debuted at $50. At current prices ($64 vs $15), the Athlon X2 QL-64 is $49 cheaper. In terms of value (PassMark points per dollar), the Phenom II X3 720 delivers 25.0 pts/$ vs 107.6 pts/$ for the Athlon X2 QL-64 — making the Athlon X2 QL-64 the 124.6% better value option.