Question Concerning (innodb_buffer_pool_size)

[Shaun Adams]

I'm currently running RHEL4.1 64-bit, mysql 4.0.26 w/ 4GB RAM and have my
innodb_buffer_pool_size set to 2GB, 
 
My question is, can I increase my ram to 8GB and set innodb_buffer_pool_size
to 4GB or even 6? 
 
Thanks