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Upgraded to GTX780 Ti - Computer Switching Off Under Load

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  • Computers
  • Graphics
Last response: in Graphics & Displays
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December 2, 2013 3:44:40 PM

Hi there,

I have a 1 year old Alienware Aurora R4 and I decided to replace my 2 Radeon 7870's with a single GTX 780 Ti. I have successfully installed the new card and drivers etc and it seemed to be working fine in Windows 8.1. However, on loading up Prepar3d (FSX) and flying for 5-10 mins the whole computer just shuts down with no warning. It is fine when just in Windows and not in games.

I have a 6 core i7 oc at 4.2GHz and monitoring the core temps they don't rise above 70. Monitoring the GPU temps is the same so I don't think it's overheating. I have an 875W PSU and I'm pretty sure this should be enough for the GTX considering it replaces two cards? The one thing I haven't yet done is upgrade the motherboard BIOS - currently on A07 and believe there is an A10 release - could this be the cause with the GTX being such a new card? I haven't updated the BIOS as I don't know how to and reading online there are some scary stories about bricking Alienwares - any advice? I also have 5HDD's installed - 3SSD's and 2HDD's - I wondered if these were drawing too much power from the PSU? Can always disconnect one if so.

Performance before shutdown is fantastic so I'm keen to try and resolve this. I'm hoping it's a pretty simple job!

Thanks

James

More about : upgraded gtx780 computer switching load

December 2, 2013 3:49:19 PM

That definitely sounds like a PSU problem. As kristianAA says, what's the brand and model? Also, it doesn't matter how high the wattage is, if the amps on the 12v aren't adequate then it won't work properly.
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December 2, 2013 5:01:56 PM

benjii said:
That definitely sounds like a PSU problem. As kristianAA says, what's the brand and model? Also, it doesn't matter how high the wattage is, if the amps on the 12v aren't adequate then it won't work properly.


Hi there it's a Dell Model H875EF-00
AC Input (50-60Hz) 100-240V /12.5A
If it is the PSU is this easy to replace? What should I be going for? I have also seen the cabling that goes into the PSU - it was one big cable with all the separate cables coming from a single 6x11 connection into the PSU. Ideally I want to be able to use this rather than replace all the cabling inside. Is this possible and does it mean I have to look for a specific PSU to achieve this?

Many thanks

James
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Related resources
December 2, 2013 6:01:55 PM

kristianAA said:
http://www.guru3d.com/articles_categories/psu_power_sup...

On peak performance even 2 7870 wint come close to power consumption of single 780ti:)  I think you are short on amps, and that old dell just dosent have enough juice


Thanks Kristian, I guess a new PSU is in order. Will it be relatively easy to get one with the same single connector from the PSU so I don't have to switch all the wires out? Anything I should look for apart from Wattage when buying? Thanks again
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December 2, 2013 7:15:33 PM

kristianAA said:
Which brand is you psu but signs show that psu is failing


kristianAA said:
Those listed in that website or any well know brand have all cables needed one 8pin and one 6pin


Thanks, I guess that means a complete rewiring of the system with a new PSU then? That will be a real pain as it is wired together pretty well now and will need to be totally dismantled. Are there no PSUs I could get with the same 6x11 output plug as on the Dell one?

Those that you sent through have some wattages lower than my 875w - to be on the same side do I need to go to 1000w or will a lower wattage with better components than the Dell one be ok?

James
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Best solution

December 5, 2013 12:51:38 PM

You'll need to re-wire the whole system for sure. I think this PSU ought to do the trick

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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