System Instability, suspect: GPU

Hey everyone, finally got off my arse and joined the community, been following the YouTube channel for some time. Recently I decided to splurge and build a new PC, (first completely new PC built since uh.... 2002?).

Anyway, basic specs are as follows:

  • Gigabyte Z97MX-5 Gaming motherboard
  • Intel G3258 Anniversary Edition CPU
  • 8GB DDR3 1600 HyperX ram
  • A-Data 128GB SSD
  • Asus R9 270 DirectCU II
  • EVGA Nex 750B semi modular PSU
  • Recycled a couple of 2TB Green drives for mass storage.

Build was done around mid November, and no issues were had. Gaming was good. Then I decided to play around with some overclocking after about 2 weeks once I was sure things were stable.

At first, everything was good, then I had a 2 week stretch where I had no time to game as I was focused solely on work. I started noticing an obnoxious coil whine, but the system was still performing well. I finally got around to looking into the issue, and reset the UEFI back to factory settings along with the GPU.

The coil whine persisted, so I figured I would yank the GPU out and see what happens, coil whine goes away. I kept the card out of the PC for about a week or so, and decided to maybe give it one more go.

The coil whine did not come back, however a whole host of other issues crept up:

  1. Even with FastBoot enabled, the UEFI response is slow as molasses, unbearably so
  2. When computer would wake from sleep, it would take a reboot to get the GPU to respond correctly in game (it seemed like the PCIe lanes were getting nerfed and not enough bandwidth was available to the GPU)
  3. Decided to move to Linux instead of running via Virtual Machine, and was receiving CPU soft lock messages from the Kernel during installation. Once into the desktop with GPU installed, screen updates were horrible. IE I could move a window and it would stay in place as well as move to the new location, I could use the mouse pointer to "paint away" the previous window placement on screen.

After that I pulled the GPU back out, and have been running on IGX ever since (last night).

My questions are these:

  1. Is this a GPU issue, or a Mobo issue? I'm not as familiar with the new platforms as I would like to be.
  2. Is there additional testing that I can perform specific to the Z97 platform that can help me isolate this issue?

Some of the things I have tried, is using a PCIe 6 pin supplementary power cable from an independent 12v rail (multi rail PSU, thought I was buying a different one with a single rail), with no change in the performance of the system.

These new issues (bogginess when waking from sleep, CPU kernel panics in Linux) only came about after re-installing the card. I haven't had a chance yet to grab another GPU to test with to isolate the issue to the GPU or the MOBO.

Thanks in advance,

Goon.

Sorry for your bad luck.  It sounds like you have done a good job with the trouble shooting so far. 

I can think of two things that you might try.  If your mobo supports it, put the card in another PCIe slot and try it again.  The slot you are using may be bad for some reason.  Lastly, swap out the PSU completely.  Someone correct me if I am wrong, but I believe that the GPU pulls some power through the PCIe slot, in addition to the auxiliary 6 or 8 pin power connectors.  The PSU may have a fault in the power it is delivering to the mobo over the 24 pin connector.

Hope this helps.

I believe that the pcie slots have 75watts of throughput. 

Well I was doing some additional inspection and decided to take a look at the card physically.

In addition to a faint smell of burnt electronics, I see the following (sorry for the picture quality, it's difficult to capture the contrast of the specific areas vs glare from lighting). The darkened/discolored areas appear to be scorch marks, and are directly beneath some capacitors. There is some additional "scorching" near the back of the card, again directly under some capacitors.

Looks like I have found out the source of the instability, the card got cooked.