I7 870 ES

http://www.intel.com/support/processors/sb/CS-030747.ht...

First of all there is no warranty on any ES processors so even if it were bad you wouldnt be able to get any technical support. Also since in order to get an ES processor a company has to promise that they won't sell it but seeing this processor the company or person is showing that they are not honest if they sent you a bad proessor you most likely would be out of luck on returning it.

As far reliability goes this is a preproduction processor so it may or may not be the same as it would be on release so you are really taking a big risk on buying any ES processor.

Hi and thank you for your reply. Is there any other intel cpu 1156 socket to fit my motherboard then? I am really desperate to find a quick solution.

All of these processors are using Socket 1156 http://ark.intel.com/compare/46472,46473,48505,50177,43...

The problem is that all the older socket 1156 based processors have been discontinued so you are going to have a hard time finding them.