Core i5-2540M vs Athlon II X4 645

The Core i5-2540M packs 2 cores / 4 threads, while the Athlon II X4 645 offers 4 cores / 4 threads — the Athlon II X4 645 has 2 more cores. Boost clocks reach 3.3 GHz on the Core i5-2540M versus 3.1 GHz on the Athlon II X4 645 — a 6.2% clock advantage for the Core i5-2540M (base: 2.6 GHz vs 3.1 GHz). The Core i5-2540M uses the Sandy Bridge (2011−2013) architecture (32 nm), while the Athlon II X4 645 uses Propus (2009−2011) (45 nm). In PassMark, the Core i5-2540M scores 2,356 against the Athlon II X4 645's 2,375 — a 0.8% lead for the Athlon II X4 645. L3 cache: 3 MB (total) on the Core i5-2540M vs 0 kB on the Athlon II X4 645.

The Core i5-2540M uses the PGA988 socket (PCIe 2.0), while the Athlon II X4 645 uses AM3 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 1333 on the Core i5-2540M versus DDR3-1333 on the Athlon II X4 645 — the Core i5-2540M supports 199.1% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 16 of RAM. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes. Chipset compatibility: HM65,HM67,QM67,QS67 (Core i5-2540M) and AMD 700 Series,AMD 800 Series,AMD 900 Series (Athlon II X4 645).

Virtualization support: true (Core i5-2540M) vs Yes (Athlon II X4 645). The Core i5-2540M includes integrated graphics (Intel HD Graphics 3000), while the Athlon II X4 645 requires a dedicated GPU. Primary use case: Athlon II X4 645 targets Desktop. Direct competitor: Core i5-2540M rivals Phenom II Black Edition N660.

The Core i5-2540M launched at $266 MSRP, while the Athlon II X4 645 debuted at $126. At current prices ($10 vs $20), the Core i5-2540M is $10 cheaper. In terms of value (PassMark points per dollar), the Core i5-2540M delivers 235.6 pts/$ vs 118.8 pts/$ for the Athlon II X4 645 — making the Core i5-2540M the 66% better value option.