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Slaver  
#1 Posted : Tuesday, January 31, 2023 7:22:52 PM(UTC)
Slaver

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Hello Folks,

I've built over 200 streaming systems for vMix to date, but this is the first time this problem has appeared.

System:
i7-12700K
MSI Z690-A Pro
MSI GeForce RTX 3070 Ti 8GB
32GB DDR4-3200
Samsung 500GB 970 Evo Plus M.2
2x Blackmagic Decklink Duo 2

I built this system beginning of january and it was running well with 6 cameras and 2 outputs. After 6 days of production with no changes in preset and hardware i noticed render time peaks, which wasn´t there in the beginning. The System is running usually with 7-9ms and now it get every 10 seconds a 30ms render time for a second.

Even after a complete new windows installation and using all hints of the list "Diagnosing High Render Times" of vmix the problem still occure.

Did somebody has a similar problem or has an idea what i can do?

Thank you!
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nikosman88  
#2 Posted : Tuesday, January 31, 2023 9:54:11 PM(UTC)
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Hello. I see in m/b specs that pci3 slot don't connect directly to cpu pci lanes but from chipset. You have a gpu that needs 16x lanes, 2 duo cards that need 4x lanes each (preferably connect directly to cpu lanes) and an m2 that also needs pci lanes. Maybe all this is out of specs so you have this problem because i7 cpu has 20pci lanes.. In my occasion with i7 10700 I had blue screen when running vmix with gpu, m2 drive and a bmd intensity that needs 4x lanes. When I changed m2 with a sata ssd everything ok.
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Slaver on 2/2/2023(UTC)
Slaver  
#3 Posted : Monday, February 6, 2023 9:34:08 PM(UTC)
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Unfortunately that was not the solution to the problem. This behavior is also only evident with only one capture card.
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mavik  
#4 Posted : Monday, February 6, 2023 11:24:16 PM(UTC)
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Maybe you are a bit too quick in this. According to ark.intel.com the CPU has 20 lanes. GPU = 16, m2 = 4 -> You reached 20 lanes already. Whatever is added to the PCIe bus is sharing from there on. I can really recommend using Server CPUs. I run a stone old E5-2630v4 with 40 lanes and never faced an issue until now.
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paco3346  
#5 Posted : Tuesday, February 7, 2023 1:29:12 AM(UTC)
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On the surface you're not doing anything wrong. Most consumer motherboards will split your 16x slot into an 8x to give lanes to other slots.

8x is plenty enough bandwidth for GPUs these days, especially if you're running PCIe 4
(https://www.gamersnexus.net/guides/2488-pci-e-3-x8-vs-x16-performance-impact-on-gpus)

What do you have running on your network? NDI, streaming, simple internet?
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Kayo33  
#6 Posted : Wednesday, June 24, 2026 4:45:07 AM(UTC)
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Originally Posted by: Slaver Go to Quoted Post
Hello Folks,

I've built over 200 streaming systems for vMix to date, but this is the first time this problem has appeared.

System:
i7-12700K
MSI Z690-A Pro
MSI GeForce RTX 3070 Ti 8GB
32GB DDR4-3200
Samsung 500GB 970 Evo Plus M.2
2x Blackmagic Decklink Duo 2

I built this system beginning of january and it was running well with 6 cameras and 2 outputs. After 6 days of production with no changes in preset and hardware i noticed render time peaks, which wasn´t there in the beginning. The System is running usually with 7-9ms and now it get every 10 seconds a 30ms render time for a second.

Even after a complete new windows installation and using all hints of the list "Diagnosing High Render Times" of vmix the problem still occure.

Did somebody has a similar problem or has an idea what i can do?

Thank you!






The MSI Z690-A Pro motherboard allocates the i7-12700K's 20 CPU PCIe lanes solely to:
PCIe slot 1 = GPU = x16
and M.2 slot 1 (M2_1) = Windows SSD = x4

Consequently, the two DeckLink Duo 2 cards end up in PCIe slots connected to the Z690 chipset,
whereas they should ideally be connected to the CPU PCIe lanes, as recommended by vMix.

Therefore, you need to replace the motherboard and switch the RAM to DDR5,
because no Z690 DDR4 motherboard can split the PCIe lanes to allow capture cards to be installed in slots connected directly to the CPU.

You need a Z690 DDR5 motherboard that distributes the i7-12700K's 20 CPU PCIe lanes like this:
PCIe 1 = x8 (GPU)
PCIe 2 = x8 (capture card)
M2_1 = x4 (Windows M.2 SSD)


There are two solutions:


Solution 1:

Install an MSI MPG Z690 Carbon or ASRock Z690 Taichi motherboard
and replace the two DeckLink Duo 2 cards with a single DeckLink Quad 2 card.



msi mpg z690 carbon+ quad 2.png (156kb) downloaded 7 time(s).



Solution 2:

Install an Asus ProArt Z690 Creator motherboard

add a Dual M.2 PCIe SSD adapter card (PCIe x8) to the second PCIe slot
and enable x4/x4 bifurcation mode for that slot in the BIOS

connect the two DeckLink Duo 2 cards to the Dual M.2 PCIe SSD adapter card using M.2-to-PCIe x4 riser cables



asus z690.png (270kb) downloaded 7 time(s).



however, if the GPU takes up more than two slots, or if you don't want to use up two M.2 ports,
you will need a PC case with vertical expansion slots to mount the DeckLink Duo 2 cards externally.



pc case with vertical slots.png (147kb) downloaded 7 time(s).
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