939 athlon x2 3600 to AM2x2 7750 will I feel a difference

Hello everyone , I have just purchased a Asrock 780gxh mobo and 4 gig of crucial 800mhz for around £100 , I am going to get a cpu shortly , as I am only a casual gamer I thought of spending my next £100 on an Athlon 7750 and a graphics card ..or just a phenom2 710 and use the onboard graphics , apparently i may be able to open the fourth core as I have ACC and a sb710 southbridge (a cheaper 790gx)
I currently have a
3600x skt 939 with DDR ram and a radeon 1650 pro agp graphics card
my question is will I feel a difference with the dual core 7750 ?
or should I spend over double the 7750 price on a phenom2 with NO graphics card
?????????????????????????????????????????????????????????????????????????????

You prob aint gona unlock that core. not telling you y cuz u have like 7482354236 ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????'s at the enda u post.

if you gona upgwade lata get a 720. if not upgrading and sticking with what you have, get an hd4770 and x2 7750. Or better yet, get a core 2 duo e5200 or e2200 (or e2220, forgot if it was 0 or 2...)

who the hell just rated us all down...

thanks guys i reckon , the more I think about it the 7750 and a decent ish gpu is the best option