Another ntoskrnl BSOD/Random freezes.HELP nothing worked so far!!

So i get these BSOD after switching VGA.But also sometimes the system totally freezes with the sound making a continous buzz and not able to BSOD,i have to reset.
I have cleaned up old drivers,with safe mode driver fusion and installed 13.11 catalyst.
I used to get freezes but NO BSODs with my older cards,i though it was memory compatibility,and i had fixed it.But now i get both freezes and these BSODs.

What i tried so far with no luck:

1.Sfc scannow,no problems
2.8 hours memtest86+,no errors
3.Driver verifier for one day,no result,same BSOD/freezes but no report about bad driver
4.Swapping memory,i currently have 2 GB,after removing another 2GB,i have tried different combinations on slots/sticks.Sometimes i might get more time without BSOD/freeze,like a day or two,other times i get BSOD/freeze on few hours.

The BSODs AND freezes only happen while intensive gaming.Sometimes when i tried some memory configurations,i got freezes while browsing/internet/video but NO BSOD.

So far my suspects :
-Motherboard memory compatibility.My number 1 suspect,but i have not found a consistent result.Like i said few months ago, i was getting freezes,and by trying some settings in bios (ddr2 to 667 mhz,and VBNSB voltage) i had solved them.Now their back along with BSODs.
-Bad memory sticks.Memtesting plus trying them on other computers,tells me this is unlikely.However i will try a few more combinations/settings to see.
-VGA driver.I think the BSODs are possibly from drivers,but they have been clean installed,and i can do nothing about that.
-Faulty motherboard/CPU/memory controller/VGA.Well i hope not.Except the VGA i dont have a way to test these,and i have no way to change any of the rest.

Hi Arc,
i did stopped some services from starting up,although that would speed up my boot,not expect it to stop the BSODs.
Also,i downloaded latest Logitech drivers,not that i had problem with setpoint though so far.

As for the 13.9 WHQL catalyst drivers,i was using them before changing to 13.11 and it was much worse:
More often BSODs and also the computer would hang up during restarts through windows button (had to press restart button of the tower case).

Here is another BSOD minidump.
Today i switched to two identical 2GB ddr2 modules,see how it will work.