GPU fails to function when using PCIe X16 configuration.

Z

204

09-11-2016, 10:47 PM

#1

Hello everyone. Could you share some guidance? I understand the distinction between x16 and x8 is minor, but this feels more about principle. After using GPU-Z, I noticed the graphics card was operating in x8 3.0 mode. It’s plugged into the top PCIE X16 port. The BIOS shows it as X16 connected, yet it functions natively in X8. I’ve looked through some forums and tried these steps:
- Swapping the GPU into another X16 slot
- Running Furmark and verifying with GPU-Z
- Cleaning the pins on the card
- Cleaning the connector
- Switching to a different operating system
- Reinstalling drivers
- Mounting the GPU horizontally in the case without attaching it
- Repeatedly reinstalling the card to remove oxidation from the pins
- Applying extra pressure on the CPU cooler for better pin contact
- Reviewing all BIOS settings
- Disconnecting other devices from the PCIE slots
- Reinstalling the CPU

My hardware setup is:
CPU: i7 4960x
Motherboard: Asus Rampage IV Extreme (BIOS 4901 modded for NVMe)
GPU: GTX 780 Ti
RAM: HyperX Beast DDR3 2400MHz 4x8GB
PSU: Aerocool GT 1050W

C

c_x_y
Member

227

09-12-2016, 12:45 AM

#2

You can remove the extra PCIe cards and test if it resolves the problem. Switching your GPU to a different slot might also help, since you can adjust bandwidth settings in those slots. This setup looks like a retro build—modern case design but older components, especially the GPU. It seems like a budget-friendly choice, with used 8GB RX 580 cards around $60 or less.

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Darling_Doctor
Member

207

09-13-2016, 02:23 PM

#3

PCie lanes on a retail chipset are fewer compared to Epyc or Threadripper models. LGA1150 offers 16 total slots. Using any other slots besides the GPU slot allows it to run at x8, which isn’t much of an issue considering the card’s performance doesn’t require 8GB/sec bandwidth.

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_zNinjaa_
Member

132

09-13-2016, 04:18 PM

#4

PCIE bandwidth isn't a major issue on HEDT systems, though a faulty GPU can still cause some impact.

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SHURIKP
Member

60

09-13-2016, 07:22 PM

#5

LGA 2011 offers numerous PCIe connections, making it a versatile option.

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Mael309
Member

145

09-13-2016, 08:54 PM

#6

I've already attempted all these steps. I documented everything I tried in the notes above. There’s no line selection option on my MB—only GEN3, GEN2, and GEN1. This isn’t a retro build, but the initial phase of an upgrade. I’m planning to install the 2060 Super.

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Grizugler
Junior Member

19

09-30-2016, 02:57 AM

#7

Confirmed LGA2011 configuration. Processor supports 40 lanes. According to the manual, the first slot is always X16 regardless of other device placement.

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Petard6
Member

225

10-02-2016, 02:42 AM

#8

I plan to set up a different GPU. It might function in x16. However, if it doesn't, it could be a CPU or memory problem—or possibly both.

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Soruz
Member

63

10-02-2016, 09:48 AM

#9

Intel's naming can be quite confusing, especially with models like the 4960X placed between 4770 and 4970. It seems they have a pattern that's not always intuitive!

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master_scope
Posting Freak

794

10-02-2016, 12:31 PM

#10

I’ll check the Rampage IV BIOS overview and look for any upgrade plans. It seems you’re considering a price jump next time. Used models like the B3/450 start around $50-70, 5600X about $80-100, and 3600X near $50-60—definitely a big step up from the 4960x. You might also find used 5700XT, 6600XT, or even 3060TI for similar value. The 2060s models could be better than that. Basically, unless you can snag these deals cheaply, it doesn’t make sense to upgrade to something like the X79, 780TI, or a 2400-bin RAM in a matching kit—especially if they’re likely from Hynix. IMC might be a concern too.