Old Asus P5B with new GT 720: system freeze randomly no bsod

Ichisuke

Honorable
Sep 10, 2015
21
1
10,515
Hi there. I'm having a weird problem with an old computer.
Mobo is an old Asus P5B with latest Bios, 3GB ram, win10 32bit crystal clean install and a new Gigabyte GT720 n720d3-1gl 1gb
This computer had an old 4870 that stop working (video artifacts and a led powered on the pcb) so since I wasn't looking for an expensive high card I bought the gigabyte one.
Point is that the pc continuosly and randomly freeze while browsing or just on the desktop while looking for something on the computer. It just hang, the hard drive continuosly working... no bsod.
I've already checked the ram with memtest and the hard drive, no issues.
The computer was working just fine before the 4870 went dead.
There is no antivirus or whatever installed yet that can hang up windows somehow.
I'm now using the computer with a GTX 760 that comes from my latest build, no crash yet.
Is this related to the mobo not able to power the VGA correctly? Do I have to set up something manually in the bios? I've already try to use the load defaults function in the bios, it sets everything to AUTO where you chenge frequency etc, so I'm not quite sure if it's ok for this VGA.
Also I'm using the latest nvidia drivers. The next thing I can do is using the VGA in my latest build and if it works correctly is definitely something with the mobo....?

EDIT:Tested the VGA on the new PC with the same nvidia drivers(the latest version), no issues.
As soon as I put it back in the old computer the system froze. Now I'v read about changing NB voltage in the bios or PCIe frequency, cannot change the NB voltages on my P5B but I've set ram to 800 cpu clock to 266 and pcie to 100.... testing.

Thanks(and sorry for my english)