Xeon Server Motherboard

Xeon dual core processor on regular LGA 775 motherboard.?

Im planning to buy a Xeon LGA775 type processor with dual core for my home desktop. The server motherboards are very expensive. Can I use regular LGA775 socket motherboards? What will be the disadvantages? I just like the extra L2, L3 cache on the Xeon processors.

The Cache on the Xeon Processors is not used like you think it is. I would be more than happy to explain how the Cache works for you but it's been written which saves me time to type.

http://software.intel.com/en-us/articles/software-techniques-for-shared-cache-multi-core-systems

The problem on your end is that you're going to try games... who wouldn't on your computer. The application might call for a CPU Operand that does not exist on the XEON's because they are Server designed. They're not designed for average desktop use. You'll get a Blue Screen of death or a critical system failure if your processor function is not found and an application calls for it repeatedly until it's found.

Also check out this forum.
Xeon (5420) vs. Intel Core i7(920/940)

http://www.tomshardware.com/forum/255948-28-xeon-5420-core

Personally... I would go with the Intel Core i7. It uses GigaTransfers instead of MHz.
Difference between GigaTransfers /MHz.... MHz is one way, GigaTransfers is both ways.

100MHz = 200MT/s(Megatransfers)

http://www.itproportal.com/articles/2008/09/15/gigatransfer-gt-and-megatransfer-mt/

The New Core i7 has an LGA1366 Socket and operates with speed frequencies at 4.8GT/s. Intel Quickpath architecture uses Gigatransfers/s.
Easiest way to compare the speeds so you're not confused is that Gigatransfers refer to billions of bi-transfers. Both ways... Where MHz is a uni-transfer.
e.g.; 100MHz = 200MT/s(Megatransfers)
4.8GT/s = 2.4GHz or 2400MHz per second. Which is pretty fast considering the LGA755 Sockets transfer between speeds of - 800MHz-1600MHz with the Quad Core Extreme.

Oracle OpenWorld 2009: Intel Enabled Server Acceleration Alliance (Intel ESAA)