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I'm currently building a pc for sole purpose of blender. I was just curious as to what the function of the gpu is in blender So I can decide which GPU to buy. I have a rough understanding of CPU function but not sure GPU other than it can be used to render

Blenderinho
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GPU can be used for faster viewport display, more vertices count. A PC with a powerful GPU can handle Millions of vertices and faces, but Consumer Notebooks cannot be used to get that performance. GPU can also take over some functions of CPU in rendering, it can handle Volumes , Procedural Textures better than CPU, specifically GTX is mostly used for Realtime, and is famous among gamers, and RTX is for has specific algorithms for raytracing, (useful for Cycles in blender). When you set Your GPU in the CUDA section in Preferences , you let the GPU do most of the calculations in blender(after setting to GPU Compute in Render settings) and it can do somethings faster than your CPU.

susu
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SHikha Mittal
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    GPU calculations are not "better" in general, it's just faster in some cases. – brockmann Nov 01 '20 at 16:53
  • overall you get the idea its better for like almost everything complex and can handle big amount of work which is common in CG @brockmann – SHikha Mittal Nov 01 '20 at 17:45
  • How many gb would you consider to be a ‘powerful’ gpu – Blenderinho Nov 01 '20 at 21:24
  • I would say that somewhere about 8 gb should be good @user107904 – SHikha Mittal Nov 02 '20 at 08:19
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    In other words: GPU's can't handle large scenes due to RAM limitations... The reason why production renderers like renderman, mantra, arnold or 3d light are still not entirely gpu based. Without going to much into technical details, calculations are mostly done in 16bit in order to save some space on the card (which is not that precise as it could be). So again, it's not "better" in general, it depends on what you do, as always. – brockmann Nov 02 '20 at 10:07
  • @user107904 if this answer has benefited you , you can click the tick mark bellow question voting system to declare this a correct answer – SHikha Mittal Nov 03 '20 at 04:49
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    Thank you for your help – Blenderinho Nov 03 '20 at 10:36