Processor compatibility and motherboards
Solution 1:
Yes, it is compatible.
When choosing CPU, you need to look at only two things - socket and FSB (bus frequency).
Your motherboard specification says:
Support for the following:
Intel® Core™2 Duo processor in an LGA775 socket with a 1066 or 800 MHz system bus
Which clearly states that this CPU is supported, since it is:
Core 2 Duo E6700 – 2.67 GHz (4 MB L2, 1066 MHz FSB), LGA775