I have a E 6400 2.13 Ghz (never OCed), a dead MBO abit IL9pro ,Nvidia 9600gt, EVC 500W PSU.
So im planing to buy new MBO http://www.asrock.com/mb/Intel/G41M-VS3%20R2.0/
And OC E6400 to lets say 3.0-3.2 Ghz..."please advice on a cheap cooler for it".
Another question. Would i gain much if lets say i buy Vtx3D 7750 and pair it with E6400 Oced on 3.0-3.2 Ghz with that Asrock MBO and with 2x2 GB 1333 RAM. Bottleneck?
It would be a Dota 2 ,Wow ,Swtor ,Diablo 3 ,SC2 and new Company of heroes 2 usage.
I wouldn't spend more than $20~ish for a heatsink used for an old Conroe (E6400). The best ones I know are Cooler Master Hyper 212+ or Xigmatek Gaia. Both are great coolers, and cost around $20, and will keep your cpu temp very low even after OC'ing.
Your E6400 will be the bottleneck if you pair it with 7750, more so than RAM @1333mhz. If you OC E6400 2.2Ghz to 3.2Ghz, that will definitely increase performance, but still most likely bottleneck you gaming experience about 5%~15%, depending on the game and setting. That isn't too bad though, considering how old E6400 is currently.
My opnion: upgrade your system if you want full gaming experience, but your current system sound sufficient for most gaming chores at low~mid setting, 1 monitor, for a year or so.