Resizablebar support for NVidia RTX3080 and AMD 6000 video cards and higher. Enable it if you can!

[JCitron]

I've been investigating poor performance of my fairly new PC and with Trainz and other graphics intensive programs. I came across a free utility, there's a "pro" version too to buy, that listed information about the motherboard and other devices such as my RTX3080. HWinfo 64 www.hwinfo.com

In the formation was a warning saying that the resizablebar was disabled. I checked Dell's website and found this is supported and I had to enable it in the BIOS then enable it in the NVidia Control Panel.

Here's some information on it:

Resizable BAR (Base Address Register) is a feature that allows the CPU to access the entire VRAM of a graphics card, improving performance in gaming and other GPU-intensive tasks.
-- Support: Resizable BAR is supported by NVIDIA's RTX 30 Series and newer GPUs, as well as AMD's RX 6000 Series and newer GPUs. Intel's Arc GPUs also support this feature.

-- Implementation: Each vendor implements Resizable BAR differently. For NVIDIA, it is enabled via a post-release VBIOS update, while AMD uses Smart Access Memory (SAM).

-- Benefits: By enabling Resizable BAR, the CPU can access the entire frame buffer reducing latency and improving data transfer efficiency, which can lead to higher frame rates and smoother gameplay.
-- Enabling: To enable Resizable BAR, you may need to update your motherboard BIOS and ensure your CPU and GPU are compatible. Check the manufacturer's website for specific instructions.

After enabling this option, the long latency and slow redraw of splines and assets disappeared! TRS-Plus actually performs better or about the same as the original TRS19.

When I first got this PC a few years ago, it performed nicely then the performance sagged to what I was seeing prior to this change. I thought at first the hardware was failing or there was some other data corruption which prompted me to run this hardware info program as a first step to rule out hardware issues prior to running additional diagnostics beyond Dell's Support Assistant which never seems to find much.

When I went into my BIOS to change the setting, it was in fact disabled and it was then I realized I had to reset my BIOS to defaults after a BIOS update quite a while ago and it was after this update that I had the performance problem!