I have had Precision T3500 for about 10 years. About 5 years ago, system properties began reading out total memory 8GB (I bought it with 12GB RAM), so I removed the defective module and left everything else untouched. Since then the machine gives the following message every time I boot it up...
My daughter was happy with my old stock Dell Precision T3500 (ATI FirePro 2260 card with 256MB RAM, 525W PSU, Windows 7 64-bit etc) through elementary and middle school. Now she is in high school, plays Sims 4 and other games that demand somewhat (though not much) higher graphics performance...