PSU on the way out?

Just picked up a 780ti from OcUK (for the frankly crazy price of £250, before they bumped it back up to £320) as an upgrade to my 760, installed it into my system and now dies and restards whenever any stress beyond regular programs I use (chrome/3ds Max/Photshop) is placed on the GPU. I have a 550W PSU which I realise is under the recommended 650W but nowhere has shown much of a draw from the wall beyond 380w so figured it would be fine, just not much headroom for overclocking. I am able to underclock the card to 60% (clock speeds are around 800mhz in GPUz) in PrecisionX but anything above that and the system dies.

I have a horrible feeling that my PSU is badly degraded or was faulty from that start and isnt able to draw enough power. I is a good unit - Coolermaster V550 which is basically a rebranded Seasonic good components 80+ gold 92% 45A on the 12v rail

System specs as follows:
Gigabyte m-ATX Z87
Xeon E3-1230v3
Kingston HyperX Fury 16GB 1600mhz
Samsung 840 EVO 250GB
Crucial M500 120GB
Seagate Barracuda 1TB
x3 Coolermaster Jetflo Blue fans
Xigmatek Dark Knight Cooler + PWM Fan

Dead/dying PSU?
 
Not yet, its the first thing I will do tonight along with double checking all the connections & ordering a power meter to see how much the system is drawing from the wall. I thought the difference would be negligable at stock as I had a decent overclock on my 760 (140mhz on the core and 450mhz on the memory)
 
Ok dude - Im now going to guess you used the two in one PCIE connector?

If you did use two seperate cables to power the GPU and you may find its ok. Im thinking you might be under delivering on the power requirements for the card on a single cable.

Give two separate ones a try and then test it
 
Damn, didn't think of that because I have extensions fitted, just opened the back of my case and there aren't separate cables on this PSU, the x2 PCIE connections are on one cable. Nuts.

Oh well. No money for a new PSU so the card is going to have to go back. **Deeper sigh**
 
I ran my Titan Black from a 500w PSU and it was fine. Same card pretty much.

Edit and mine are on a single cable also so you may have a faulty GPU.
 
I ran my Titan Black from a 500w PSU and it was fine. Same card pretty much.

Edit and mine are on a single cable also so you may have a faulty GPU.


Ive had 780 Ti's that like daisy chains and some that dont. The GPU isnt faulty fella its likely the card just wants cleaner juice.

Ive had cards not like daisy chains on an AX1500i - its just one of those quirks with some silicone
 
Ive had 780 Ti's that like daisy chains and some that dont. The GPU isnt faulty fella its likely the card just wants cleaner juice.

Ive had cards not like daisy chains on an AX1500i - its just one of those quirks with some silicone

Yeah had an odd issue once where a 295 (GTX) would not power up if I used 8 pin extensions :confused: as soon as I removed them it worked fine lol.

It might do an amp draw test at start up and if the cables can't provide enough juice it simply refuses to fire.

Thank god my Titan doesn't do that, I'd be screwed !
 
So I'm guessing this whole thing would require an RM 650 or a 650W Leadex?
650W on those units should mean ample headroom and clean juice to the card... Then again, both units are quite expensive even in the UK as I can imagine
 
Just removed the PCIE extensions to see if they were a possible cause but the same thing happens, 5 seconds of Valley or Iray at just 70% power and then the whole rig dies and starts back up again.

I did notice that there is an ungodly amount of inductor noise coming from the card when under load for that short period which is easily audible over 4 Jetflo fans (which aren't exactly whisper quiet even at 800rpm) in my N200 case with the side panels on.

I'd probably be looking at a 650W EVGA, so that I can grab the compatible Cable mod set later on but I have other things to purchase this month for my wife and children and they come first. The card was a bit of an impulse purchase, I saw it was being sold for £250 brand new at OCUK and couldn't not buy it. They have a 14 day unwanted returns policy so I'll send it back tomorrow.

I don't mind going back to my 760, it has an extra GB of Vram which is better for working with Iray. It's a little outmatched by my 1440p monitor but part of the joy of PC gaming is being able to tweak settings to suite your hardware.
 
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