Intel · Core 2 Extreme · 2008 · LGA771
The Intel Core 2 Extreme QX9775 is a desktop processor with 4 cores, released in 2008 at an MSRP of $1,499. It is part of the Core 2 Extreme lineup, using the Core 2 platform, and fits the LGA771 socket. Internally, it is built on the "Yorkfield" architecture. It operates at a fixed 3.2 GHz. Intel manufactures the "Yorkfield" silicon on a 45nm process node. The multiplier is unlocked, making overclocking straightforward. This processor supports DDR2 memory. With a TDP of 150W, the Core 2 Extreme QX9775 runs hot and requires a capable cooling setup. This processor has no integrated graphics — a discrete GPU is required. The cache hierarchy consists of 32KB/core of L1 and 6MB of L2 cache. There is no L3 cache on this processor.
The only Core 2 Extreme that used LGA771 (Xeon socket) rather than LGA775. Designed for Intel's dual-socket 'Skulltrail' platform — two QX9775s in one workstation giving 8 cores total. Not compatible with standard LGA775 boards without a physical adapter.
| Brand | Intel |
|---|---|
| Family | Core 2 Extreme |
| Series | Core 2 |
| Architecture | Yorkfield |
| Type | Desktop |
| Launch year | 2008 |
| Cores | 4 |
| Threads | 4 |
| Base clock | 3.2 GHz |
| Boost clock | 3.2 GHz |
| L1 cache | 32KB/core |
| L2 cache | 6MB |
| TDP | 150W |
| Socket | LGA771 |
| Process | 45nm |
| Memory type | DDR2 |
| Integrated graphics | None |
| Chipsets | Intel 5400A |
| Launch MSRP | $1,499 |
| Part number | EU80574KJ080N |
| OEM / tray part number | EU80574KJ080N |