A little more than a week ago, I acquired an ASUS Strix GTX970 4GB OC. I've been noticing alot of sporadic stuttering whilst playing games and I'm kind of puzzled to what it could be. Very frustrating.

I've monitored my system with HWiNFO64 and saw no abnormalities in CPU, GPU and RAM usage. Nor did I see any in CPU and GPU temperature. A friend of mine said I should look for abnormalities in temperature as he suspected that throttling would be the issue. I've also run Furmark but did not observe any faults either.

What I am noticing while booting up or playing games, is that the VRAM usage indicator on ASUS's GPU Tweak 2 goes no further than 6% an most of the times just idles at 0%, which is why I suspect the GPU to not function correctly. Could there be something I've missed?

Could it be the the powersupply that I recently purchased? I felt the need to purchase a new powersupply as my old one only delivered only 25A on the 12V rail. The minimum seemed to have been 28A and it said 38A was recommended on the card's box. I had no money to buy me a really good one, so temporarily went for a Corsair CX600M. I know that the chance of the powersupply being the culprit is very slim, but I thought I should state the potentially necessary.

I'll state the specifications of my system below to give you guys more clarity on this matter and help you answer my (very) vague question:

  • Antec GX300 case
  • ASUS P8H67 Motherboard
  • Intel i5 2400 processor
  • ASUS Strix GTX970 4GB OC
  • Mushkin 240GB SSD
  • Samsung 500GB 5400rpm HDD
  • Corsair CX600M PSU

The system was recently clean-installed with Windows 7 Ultimate edition. Games tested include GTA V, MS Flight Simulator X and CS:GO.


As suggested by Psycogeek, I have checked the current Link Width in the Main Board section of CPU-Z and saw something that might be remarkable:

CPU-Z Link Width

The card installed into the lower PCI-E slot of the motherboard. Could this slot be defective? Should I try the other slot?

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    As a troubleshooting step, try under-clocking the video card's core and memory and see if it becomes more stable. – user5071535 Aug 26 '15 at 22:48
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    @FarizFakkel, Oops, my bad! Looks like you're using slot "PCIe x16_2", which is supposed to provide a x4 link, so that slot is definitely suspect. If you have similar issues on slot "PCIe x16_1", then it's probably the video card. You could try cleaning the slot contacts if that's the case. Note also that your motherboard manual recommends slot PCIe x16_1 if you're using a single video card. – user5071535 Aug 27 '15 at 17:36
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    @user5071535 No worries man. It's alright. You've helped enough as is. Everything runs smoothly now that the card is inserted into the correct slot. CPU-Z also indicated the correct Link Width. I don't want to make any excuses, but since the print on the mobo stated "16x PCIe 2.0" above the card, I assumed that the card would run as it should've. Still, I can't help feeling stupid for my error. I'll make sure to refer to the motherboard manual in the future. In case you answer the question, make sure enough credit/(comment-) upvotes go to Psycogeek for the great lead in the "investigation". – Fariz Fakkel Aug 27 '15 at 19:47
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    Good to hear all's well, I'll let @Psycogeek answer since it was his hunch. – user5071535 Aug 27 '15 at 19:55
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    I think it would be fair enough to write the answer myself. I will do this later. – Fariz Fakkel Dec 23 '15 at 12:58

As Fariz Fakkel & user5071535 note in the comments you were using the wrong PCI slot. As per your subsequent edits & comments you were using the second PCI slot (PCIe X16_2) when your motherboard recommends using the first slot when using only one video card. The second slot is also only x4 PCI

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