omega1988 :
in CPU-Z always shows 6x(6-9.5) no matter what i change in the bios . but in bios even if i change to 9x after save and reboot it returns to 6x as if i didn't change or saved settings .
yes it crash after 5 minutes
So it does show 9.5x multiplier in cpu-z if you put it under load? Or are you saying that if you set 6-9.5 in teh bios it shows as 6x in cpu-z?
Have you used that memory before without any crashing issues or other issues?
If it's crashing when you set the FSB (cpu host frequency) to 333 and the ram to 2.0 multiplier I would suggest contacting the Gigabyte. They are advertising that this product will work with the e8500 so I think it's on them to let you know how to do it since they're auto overclock settings don't work.
The only other thing I could think of doing is changing some voltages but you are likely to run into serious temperatures issues with that if you don't have good case cooling, a quality aftermarket CPU cooler and a quality PSU. You can really damage the chip and your motherboard if you put too much voltage though, so I would really suggest contacting gigabyte to see if they can tell you waht settings you need to run. If for whatever reason you decide to change voltages keep in mind that 1.3625V is the limit for this CPU. Again, I would really suggest contacting Gigabyte to see what they have to say before playing with voltages. Changing voltages can cause drastic temperature increases on your CPU and motherboard.
Also, try using HWmonitor to see your CPU temperatures.
http://www.cpuid.com/softwares/hwmonitor.html
Simple to install like cpu-z.
Run Hwmonitor and do what you do normally for the 5 minutes it takes for windows to crash and let me know what temperature you see. There should be a CPU temperature and below that there should be 4 temperatures for each core. The 4 temps we need to know will be the core ones. If you see temperatures around 80 or more shut off your CPU, it shoulnd't be running higher than around 72 under full load.
Did you install the cpu cooler yourself? If so, did you apply thermal paste properly? (sometimes parts come with pre-applied paste, you should be ok if it that's the case).