If anybody considers upgrading a GPU for ultra wide display or triple display systems with nVidia surround, here are my results:

CPU: i7-7700K 4.2 GHz (4 physical cores, 8 with hyper threading enebled, not so new) overclocked to 4.6 GHz
RAM: 32 GB
SSD
3 x 1920x1080 displays with nVidia surround with bezel correction resulting in 5900x1080 resolution
few clouds, day, C172 steam gauges, final approach to EPPO (generic regional airport in non-photogrametry city)
most settings on Ultra, some on high

1070Ti + ca. 10% overclock - ca. 25 FPS (GPU limited)

3070 + ca. 10% overclock - ca. 44 FPS (with a potential to set more settings to ultra and still having 30 FPS)

I would say for higher resolutions (like 5900x1080) the GPU upgrade provides significant benefit.

Edited November 10, 20205 yr by Steku

Would it be safe to assume these test results were with lots of clouds, something to tax the cards a little?

Interesting! Good to know. Does it max out the VRAM?

Both 1070Ti and 3070 have 8 GB of VRAM, so I can't report any usage difference. I have seen VRAM consuption above 7GB, but no apparent VRAM issues I noticed. I can only guess that sim/driver is aware of the amout of available VRAM and handles it accordingly.

Both 1070Ti and 3070 tested with few clouds preset, the same flight stage, tha same conditions.

The general consensus in other games is the amount of VRAM does not really effect average or max FPS by any significant margin - but it DOES have a big effect on how much stuttering you will suffer from.