evyosh :
of cause you can install a 256bits GPU... what GPU are you trying to install? and what motherboard do you have?
there is a similar question may look into it also : http://www.tomshardware.com/forum/id-1663429/128bits-256bits-graphic-card-core-duo-processor.html
GV-N420-2Gl ,GV-N430-2Gl and gt 9400 these r 128 bits and gt 9600 gso 512 (256 bits). I will install one of these but i want to
install 256 bits so that's why i m asking.
MY mother board is Dell Inc. 0M863N (CPU)
also reply to my second question which is that can i run windows 10 on my pc.
250 HDD,4gb ram ddr2,graphics card(will be the one of the above),dell optiPlex 760 core 2 duo 2.80ghz processsor