Hi all as my last built is around 3-4 years old, and I'm now almost always working in 4k and with LUTs, I was wondering if it's time for an upgrade. My ( almost only ) gripe is still Vegas' preview performance, and as I don't intend to go to a proxy workflow, I was wondering if things have evolved between Vegas and new and faster GPUs.
A 3070 is a very capable GPU even in 2025. You can see the two benchmarks in my signature for a sense of how different CPU/GPU combinations scale (feel free to fill it out for your system).
If you are using 10-bit 422 HEVC or AVC media you might benefit from a 50XX NVIDIA that's capable of decoding it in the future once VEGAS gets that capability.
Beyond that I'm skeptical you'd see an improvement by putting money into hardware vs just keeping VEGAS up to date and benefiting from the evolution of the video engine and decoders.