Suggest best php-fpm configuration

Hi,

I am srikanth working with a ecommerce company. We have a hardware loadbalancer which sends traffic to 2 web servers in round robin fashion. Two web servers which are dedicated to serve web requests. Database servers are seperate.
Here is the configuration of web boxes I have.

Intel E5620 processor 2.40Ghz, 32GB (3*8GB+2*4GB) RAM , 300GB *4 HDD

Also when i do nproc .. output is 8.

We have ubuntu 12.04 OS, nginx[nginx/1.1.19] web server, php-fpm [PHP 5.3.10-1ubuntu3.4 (fpm-fcgi) ].

Please guide me with the best configuration to handle 10000 requests per second.

Srikanth