I always head to two places.
1. The maker's specs on the maker's web site.
Why? There's nothing fun about troubleshooting RAM troubles.
What would be the Max. capacity of RAM for following system configuration:(specify the no.of modules per GB)
Version: Thinkpad T410
Mainboard model: 2522DMI
Processor: Intel core i5 540M 2.53GHz
CAS Latency: 7.0
Also, suggest the best possible RAM for above system.