CPUDesktopReleased 2009

Intel Core 2 Quad Q9400S

4C/4T · 65 W

The Core 2 Quad Q9400S is the 65 W low-power version of the Q9400, introduced in January 2009 alongside the Q9550S and Q8200S. It keeps the same four cores at 2.66 GHz, 6 MB of L2 cache (2 x 3 MB) and 1333 MHz front-side bus as the standard 95 W model, making it suited to small and quiet LGA 775 systems.

General

Manufacturer: Intel
Model: Intel Core 2 Quad Q9400S
Segment: Desktop
Generation: Core 2 Quad (Yorkfield)
Codename: Yorkfield
Architecture: x86_64
Microarchitecture: Yorkfield
Release date: 2009
Price: Search on Amazon

Cores & clocks

Cores / threads: 4 cores / 4 threads
Base clock: 2.66 GHz
Boost clock: —
TDP (design W): 65 W
Unlocked: ✕ No
L2 cache: 6 MB
L3 cache: —
Technology (nm): 45 nm
Intel 45 nm

Platform

Socket: LGA775
2-CPU (multi-socket): ✕ No
Integrated GPU: None
Memory type: —
Memory size: —
ECC memory: ✕ No
PCIe: —

Instructions & AI

Instruction extensions: MMXSSESSE2SSE3SSSE3SSE4.1Intel 64VT-x
NPU: None

OS support

Windows: Windows 10
Linux: UbuntuFedoraArch Linux
Notes: Windows 11 is out of reach: the chip is far below the 8th-generation floor on Microsoft's supported-processor list and its platforms offer no TPM 2.0 or Secure Boot. Windows 10 and the mainstream Linux distributions still install, because they are built for the x86-64 baseline, but the CPU has no SSE4.2 or POPCNT, so any software that requires x86-64-v2 or newer will not run. ChromeOS Flex does not cover hardware of this era.

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