Phenom II X3 B77 vs Atom C3508

The Phenom II X3 B77 packs 3 cores / 3 threads, while the Atom C3508 offers 4 cores / 4 threads — the Atom C3508 has 1 more core. Boost clocks reach 3.2 GHz on the Phenom II X3 B77 versus 1.6 GHz on the Atom C3508 — a 66.7% clock advantage for the Phenom II X3 B77 (base: 3.2 GHz vs 1.6 GHz). The Phenom II X3 B77 uses the Heka (2009−2010) architecture (45 nm), while the Atom C3508 uses Goldmont (2016−2017) (14 nm). In PassMark, the Phenom II X3 B77 scores 1,844 against the Atom C3508's 1,831 — a 0.7% lead for the Phenom II X3 B77. L3 cache: 6 MB (total) on the Phenom II X3 B77 vs 8 MB on the Atom C3508.

The Phenom II X3 B77 uses the AM3 socket (PCIe 2.0), while the Atom C3508 uses FCBGA1310 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1333 on the Phenom II X3 B77 versus DDR4-1866 on the Atom C3508 — the Atom C3508 supports 28.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Atom C3508 supports up to 256 GB of RAM compared to 32 GB — 155.6% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 0 (Phenom II X3 B77) vs 12 (Atom C3508) — the Atom C3508 offers 12 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AM3 (Phenom II X3 B77) and Intel FCBGA1310 (Atom C3508).