Question My PC reboots after windows loading screen comes up

[Harrrdik18]

I have GA-G41MT-S2 (rev. 1.3) motherboard ,it have 2 ram slots of ddr3 I already had 2gb ram(1333mhz) and later I fixed another 2gb ram (133mhz)
It was showing memory runs at dual channel interleaved at boot up
My computer worked fine till 5th time I ran it
at 6th time it started getting restart after after 20 every minute
So I decided to run them separately ,
when I ran it with my old ram it worked fine
when i ran my pc alone with the new ram I got it started restarting after windows loads up

So Is my RAM damaged or is there anyway to fix this

 

[Calvin7]

2x 4GB DDR3 1066MHz PC3-8500 DESKTOP Memory Non ECC 1066 Low Density RAM
https://www.ebay.com/itm/8GB-2x-4GB...Non-ECC-1066-Low-Density-RAM-8G-/331724485983

Your old and new memory may not be compatible with each other. I suggest you return the new memory and use the ones in the above link.

 

[Harrrdik18]

2x 4GB DDR3 1066MHz PC3-8500 DESKTOP Memory Non ECC 1066 Low Density RAM
https://www.ebay.com/itm/8GB-2x-4GB...Non-ECC-1066-Low-Density-RAM-8G-/331724485983

Your old and new memory may not be compatible with each other. I suggest you return the new memory and use the ones in the above link.

If it weren't compatible why did they worked first 5 time for like 10 hours I am little curious about that and I forgot to mention it in my OP this new ram was given to me by a friend who don't have any use of ddr3.