Hi Mel
A 2gb gpu is probably now the minimum requirement to run SH5.
There are some posts kicking around Subsim that can point you in the right direction to help reduce the gpu load.
It is interesting that you said you could run stock ok.
Stock = minimum load
Running with your mod list = game problem.
If you read the documents that come with this mod then I would suspect that these are heavy on resources.
Replaces these
SteelViking's Interior Mod V1.2
SteelViking's Interior Mod V1.2.2 Patch
With this mod >
first folder only
JSGME position is 1
NDB,NDH OM#1 - No Dialog Indicator
You do not have the resources to run DynEnv mods with high resolutions.
High resolution mods should only be used with a top spec computer.
If you still want to retain these mods then change to low resolution and enable in numerical order.
Personally I would just run these 2 below in JSGME positions 2 and 3 and see how you get on.
DynEnv v2.9 - 1. Main Mod
DynEnv v2.9 - 2. Main Mod Low Resolution Patch
< In 2nd folder
Peter