Forum:Strange stutering issues

My spec - Core2Duo 2.4, NVidia Geforce 8600 GTS.

Everything was fine at first installation on old system. Fine framerates (40-60) and no problems at all/

After windows reinstallation i found my Borderlands starts stutter after about 5 minutes of gameplay (its unnoticable at the start). Every 30-60 seconds FPS drops from 40-60 to 19-25 for half of second, wich results in "jumpy" gameplay.

Ive searched all kind of forums, tried different solutions including defragmentation, INI-tweaking, changing drivers - tried numerous of them from 186.18 to 197.45 and new 258.96, with no result - FPS are better at recent drivers, but they still drop down to 19-25 every now and then.

Need suggestions besides standart "Defragmment your drive", "Change videocard" and all such unhelpful crap.

Maby there is some unusual INI-tweak, or special driver, that i missed?