Latency and Graphics Card

I am stuck with latency issue. My system uses MESA through ethernet.

I have Gigabyte H310 S2 2.0 motherboard + Intel i3 6100T (2core) processor+8GB RAM.

This machine when tested earlier without a graphics card had showed Max jitter around 50,000~80,000ns. Then I had added a Radeon(AMD) 2 GB graphics card which clutched latency values within ~30,000 ns.

Now, while testing with actual control panel after complete wiring, the graphics card malfunctioned (temp above 60 Degree C plus monitor black out) and resulted a 49ms latency spike. After removal of graphics card latency returned back to 80,000~115,000ns.

Now, if I conclude that graphics card really helps managing latency, am I doing wrong or right?

Another query, in LCNC documentation, it is written "Graphics card capable of at least 1024x768 resolution, which is not using the NVidia or ATI fglrx proprietary drivers". Now what does that mean? In india, most graphics card uses NVIDIA brand name on packing, not sure about the driver though. Can those be used?

Use the built in graphics, no add on cards, those usually make latency worse, especially NVIDIA.
Really old Matrox cards were good and had no impact on latency.

You can try a CPU without a iGPU (i.e. a series with the F suffix). Coupled with AMD's discrete graphics card, which I use now, it works very well.

 

I did some testing minths ago and have the same results.
With the Rt kernel, AMD graphics have the lowest latency numbers, with the onborad graphics disable into Bios.The onboard Intel ghaphics was 2a and the worst and I don't recommend to use was Nvidia cards. I teste one 1050 and a Quadro and the results are the same. For some reason the native drivers from Debian to Nvidia dont like the RT kernel, and I could no find a soluntion for it.

With my experience of my last setup, it is safer way to opt for inbuild GPU with higher RAM and more importantly two identical RAM on both slot of motherboard.
It really improved latency.

I have just discovered that if you use an old VGA screen on a computer having both VGA and DISPLAYPORT or HDMI outputs, performance will be much better if you connect your VGA screen to the DISPLAYPORT or to the HDMI port using an external adaptor than connecting the screen directly to the VGA output.
The reason is because the VGA output is managed by a secondary chipset via the southbridge and this chipset is managed directly by the processor, not by the GPU that in that case is totally useless.