A low voltage quad-core Xeon with a TDP of 50W (regular models in this speedrange are rated 80W). The L5320 was released in March 2007 where. This engineering sample pre-dates that by roughly a month. > Read more

The slowest CPU in the 65nm Clovertown family. It is equipped with 4 cores that run at just 1.6GHz. It was cheaper but usually not the best option if you wanted decent performance for your end-users. The 2.33GHz and higher clocked parts offered snappier performance.

Because this CPU has the lowest multiplier available in this CPU-architecture it doesn't have EIST (Enhanced Intel Speedstep Technology) since it can't clock lower than multiplier 6x. EIST relies on lowering the multiplier (along with vCore) in order to reduce energy consumption. > Read more

The Xeon X5355 is available in three different sSpec numbers:
SL9YM and SLAC4 being B3-steppings and SLAEG being a G0-stepping just like this QWTM engineering sample. I'm not sure what the difference is between SL9YM and SLAC4. The G0-stepping has a lower TDP and overclocks better.

The G0-stepping was released in April 2007 which is about 2 months earlier than this engineering sample.

The X5355 runs at 2.66GHz and boasts 4 cores. A good performer in it's day. > Read more

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The brother of the X5355 but running at 3GHz rather than 2.66GHz. A good performer in it's day. This engineering sample is released about 3 months before the production version hit the market. > Read more