Athlon 300U vs Core i5-2400

The Athlon 300U packs 2 cores / 4 threads, while the Core i5-2400 offers 4 cores / 4 threads — the Core i5-2400 has 2 more cores. Boost clocks reach 3.3 GHz on the Athlon 300U versus 3.4 GHz on the Core i5-2400 — a 3% clock advantage for the Core i5-2400 (base: 2.4 GHz vs 3.1 GHz). The Athlon 300U uses the Raven Ridge 2 (2019) architecture (14 nm), while the Core i5-2400 uses Sandy Bridge (2011−2013) (32 nm). In PassMark, the Athlon 300U scores 3,861 against the Core i5-2400's 3,870 — a 0.2% lead for the Core i5-2400. Geekbench 6 single-core — the metric most relevant to gaming — records 900 vs 595, a 40.8% lead for the Athlon 300U that directly translates to higher frame rates. L3 cache: 4 MB (total) on the Athlon 300U vs 6144 kB (total) on the Core i5-2400.

The Athlon 300U uses the FP5 socket (PCIe 3.0), while the Core i5-2400 uses LGA1155 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2400 on the Athlon 300U versus DDR3-1333 on the Core i5-2400 — the Athlon 300U supports 28.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 32 GB of RAM. Both feature 2-channel memory with ECC support. PCIe lanes: 12 (Athlon 300U) vs 16 (Core i5-2400) — the Core i5-2400 offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: FP5 (Athlon 300U) and H61,H67,P67,Z68,B75,Z77 (Core i5-2400).

Neither processor supports overclocking. Virtualization support: AMD-V (Athlon 300U) vs VT-x, VT-d, EPT (Core i5-2400). Both include integrated graphics — Radeon RX Vega 3 (Athlon 300U) and HD Graphics 2000 (Core i5-2400) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Athlon 300U targets Budget Laptop, Core i5-2400 targets Legacy Desktop. Direct competitor: Core i5-2400 rivals Phenom II X4 975.