wireless setting

Hello. I have an old Edimax BR-6428nS wireless router that does its job for my humble purpose. I always wondered about advanced wireless settings in its web interface that I never touched. Recently wireless throughput and ping times changed not for the better so I changed the channel on 2.5GHz...

Someone has told me recently that my graphics card was un-upgradable. Could someone confirm this or say otherwise? Also, if upgradable, I would like to purchase a new graphics card if i can, so reccomendations would be well appreciated PC Specs ...