CPU Data for comparison:
==================
E4300 (Dual 1.80 GHz, 2MB, Allendale, FSB800, DDR2-800 )
E4400 (Dual 2.00 GHz, 2MB, Allendale, FSB800, DDR2-800 )

E6600 (Dual 2.40 Ghz, 4MB, Conroe, FSB1066, DDR2-800 )
E6700 (Dual 2.66 Ghz, 4MB, Conroe, FSB1066, DDR2-800 )


Problem:
======
I have an Intel Westchester Motherboard (3 yrs warranty) with 2x 512MB DDR2-800 to increase by 2x 1GB DDR2-800 and would like to upgrade the current E4400 CPU to E6700 - but these (FSB 1066MHz) are no longer available (only the FSB 1333MHz) !!
- Why pay more for a motherboard to get into such a dilema.
- Next time I will buy a cheaper (non Intel) motherboard and upgrade it together with the CPU !

I forgot to mention, that the Intel Westchester Motherboard can take CPUs with FSB 800MHz and FSB 1066MHz. However not the FSB 1333MHz.

What can you say. Technology has marched on. The Westchester board was good in its day but now if you want a Intel board you will need to get a G33 chipset version to that supports the latest and greatest processors from Intel. I would recommend either the DG33FB or DG33BU board as a replacement for your Westchester board. You can still buy a E6700 but it will cost more than the 1333 FSB based equivalent.

Obviously Intel wants to sell the newer processors.

The peformance increase isnt worth the price IMO anyways.