Intel Xeon X3220
Drops into a supported LGA 775 board as it is; check the board's CPU list. How to check.
Intel Xeon X3220: 4-core, 2.4 GHz, Kentsfield, LGA 775, 1066 MT/s FSB, 8 MB (2 x 4 MB) L2, 105 W TDP.
Put an X3220 next to a Core 2 Quad Q6600 and the specs match: same Kentsfield silicon, clock, bus and cache, with a Xeon name on the lid. A 266 MHz bus clock times 9 gives 2.4 GHz. That makes it an easy quad for an old LGA 775 desktop or a small VT-x home server, as long as the cooler can handle 105 W. ARK gives that single TDP; Wikipedia splits the rating by stepping into 105 W and 100 W, and the table stays with ARK. Two steppings shipped: B3 as SL9UP (CPUID 6F7) and G0 as SLACT (CPUID 6FB). Tcase is 62.2 °C, a fairly low limit, so keep the heat spreader cool.
| Family | Xeon |
|---|---|
| Codename | Kentsfield |
| Socket | LGA 775 |
| Cores / threads | 4 / 4 |
| Base clock | 2.4 GHz |
| Front-side bus | 1066 MT/s (267 MHz base clock) |
| Multiplier | 9x |
| L2 cache | 8 MB (2 x 4 MB) |
| TDP | 105 W |
| Process | 65 nm |
| Launch | Q1 2007 |
| Dual-socket capable | No |
| VT-x | Yes |
| SSE4.1 | No |
| Enhanced SpeedStep | Yes |
| Max case temperature | 62.2 °C |
| Voltage range (VID) | 0.85 V to 1.5 V |
Steppings and microcode IDs
| Stepping | CPUID | sSpec |
|---|---|---|
| B3 | 6F7 | SL9UP |
| G0 | 6FB | SLACT |
A BIOS needs a microcode update matching the CPUID (and, for Xeons, the LGA 771 platform ID). See LGA 771 Xeon microcode and how to read your stepping.
Mod notes
It sits in a stock LGA 775 socket. Check the board maker's CPU list for the X3220 and its stepping; a listing for the Q6600 alone is a hint, not a promise.