System shut off issue

[Blacksunshine]

Hey guys. I just recently got a new machine built (3 weeks ago), and up until today all has been well. Today i bought a new video card (which has a lower power draw then my old card) and installed it. Then suddenly, after a few hours, it just shut down and the power button wouldn't respond until I unplugged the power and plugged it back in. Now as I said.....up until the installation of the new card it was great. here are my system specs.

AMD FX-8350
Asus M599X Rev 2.0 Mobo
16 gb of Kingston HyperX ram @1600
Seagate 1tb HDD
New GPU Gigabyte 650gtx Ti oc 2gb. (With 1 6 pin power Connector)
Old card was the Zotac 9800GTX+ 1gb (With 1 8 pin power connector)
Thermaltake Tough power W0104RU bronze PSU @ 650W
Windows 8 Pro

I realized I never uninstalled my old card or the drivers to do a clean install. So when i plugged in my card (and the extra power pin) It just loaded up from what was already on my system. I then got some beta drivers that work with Crysis 3 open beta. Now I realize that it could have been a bad driver conflict. However, i am used to seeing the BSOD or a lock up when a driver conflict occurs. would this be the cause? I did uninstall all of my nvidia stuff and my GFX card and did a squeeky clean install of it. I even looked over my mobo to make sure no caps are going, and it came up clean. I am hoping it solved the issue...but does anyone have any other suggestions on this issue?

[Train]

Have you made sure the inside of the case is clean? Overheating can cause that. And when I lived in the Seattle area, I had to clean my rigs every 3 weeks or they overheated. Yes the air was that dirty in the Kent valley.

[Blacksunshine]

my case is super clean as it is new. I read somewhere that a PSU will lose about 10% power capacity per year (depending on the usage) and I never turned my system off, aside from rebooting. If that were true...my 5+ years old PSU would be drawing an average of 417 watts.....which would explain why my system shuts off after i installed the new vid card and put it under any good amount of load. I just bout a 725watt PSU and installed it. Hopefully it will return to stability.

What are your thoughts on the the PSU power loss theory if you have any. I am curious to know more about this and see how true it is.

[Train]

I agree with the caps failing and power supplies deteriating as time goes by. Seen it happen a few times. I used a AC amp meter to verify the draw.
So replaced the PS, 480 with a Xion 600 and that was a overkill per this site.
http://www.extreme.outervision.com/p...ulatorlite.jsp

7 years and it still pulling like it should.

[Blacksunshine]

Yea. I used that calculator. My pc would need a 450 watt psu. Add 30% and i get 600. So my 650 watt from 5+ years ago at 10% power loss per year would put it at about 417watts. My new vid card took it over the top and it couldn't handle the slightest load.

[Train]

Things working OK now?

[Blacksunshine]

So far all seems well. Hope it was the issue. Good chatting with y'all again. Best tech support ever

[Steve R Jones]

I never heard the 10% theory... And I'm using an 8 or so year old Dell that started with a small psu... On the other hand - nothing lasts for ever and a failing supply can cause what was happening.

[Train]

DrMDJ is the one who brought it to my attention initially.
But you are right a light pull on the power supply does tend to extend the ps lifespan.