Hello guys, Just upgraded to an MSI GTX 970, did a 3D Mark vantage benchmark and got a score of 44K. When I started to play AC blak flag for about 48 minutes, my PC shut down without a warning. I started the game again and PC shut down after only 5 minutes or less of gameplay. The same process continued until I couldn't even get to windows or even see the BIOS screen sometimes. Same problem whn I put an old 9800gtx+ that requires 2 power cables. Do you think my PSU is dying ? if so, how could it run 3D Mark Vantage GPU test and 48 munites of AC blak flag without a problem ? what do you think guys, I really need some help here and I can't get a good PSU here in my country so easily. Additional informations : 1-This PSU powred a 9800gtx+ for 2 years and a 660ti GTX for 1 year and half. 2-I've Tried donwclocking my CPU from 4.2 to 3.8Ghz, in order get some extra power room and it didnt work. 3-Tried to run the system with a graphics card that doesn't require any power cable and it worked fine so PCI-e slot is fine. 4-PC configuration is : Motherboeard : Gigabyte GA-Z77X-UD3H PSU : Antec Earthwatts 500W CPU : 3570K @4.2 and then @3.8 GPU : MSI 970 GTX RAM : 4x2 Corsair Vengeance 1600Mhz Storage : 2 HDD + 1 SSD Cooling : Cooler Master Evo with 2 fans + 1 back panel fan Thanks for any help and sorry for my bad english.