I Have Check http://www.systemrequirementslab.com/cyri/intro.aspx for review my CPU (Celeron). It say my CPU below minimum Requirement and the minimum Requirement are Pentium 4 or other equivalents for some games. I quite doubt about it, so give your opinion about Plus and Minus of those CPU in gaming view
with games the cpu and the gpu have to be somewhat new as games stress out a pc more then just loading an os and running the web. with intel on the older 775 and older chipset you have there p line and the c line of cpu. the p line were the more costly chips as they were faster and did not have thing like some of there cache turned off. you see it today with the i3/i5 line the i3 are all 2 core cpu and the i5 are 4 core. with old pc there is a point that is cost more to upgrade it and you wont get the bag foe the buck as a newer cpu and mb will give you. this is one of the times where a 5-7 year old system has had a good life..you can use it as a web pc or as a storage pc or see if a small local library or boys club need a pc that good for word and web.
a lot of library use older software and need older pc to keep running there old software.
i would look into the new i3 or the g line of cpu and a h/b chipset mb and 4 gig of ram and a 550ti/560ti or a 7770 gpu as a min gaming pc now. if you have extra cash i look into an unlocked i5 and a x68 or z77 mb.