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Key hardware for complex scenes in viewport?

Guys, what is the bottleneck hardware for Zbrush when handling multimillion poly meshes in a vewport? Would it help handle complex scenes more fluently with Xeons rather than on i5s? Basically, this is my current config:

CPU: i5 3.20 Ghz
GPU: GeForce 750 Ti 2Gb vram
RAM: 32Gb

And still when I have let’s say 20 mil. poly mesh in a viewport I experience noticeable lag when placing alphas and sculpting. What should I upgrade in first hand? Thanks!

20 million polygons is a lot even on an i7 (sometimes). I know nothing however about Xenon processors so I cant speak for those.
On the other hand you can use HD sculpting and go into the billions under XP on far lesser systems so its sort of a matter of how you go about doing stuff.
You have a lot of ram, your videocard has nothing to do with it (Zbrush is only using your CPU), so if there’s a bottleneck Im going to have to guess its the i5.
But, that’s just a guess.

Thanks!

No sweat!
But I forgot something, you can also use multiple subtools and this can help a lot.
If you can see if what you are working on can be divided up into parts, this can make it much easier to work on, so something with twenty million polygons could be broken up into four chunks each having five million for example.
Sometimes that’s not practical, like with a person, having the arms legs and head separate from the body might not go well, but if its a tractor you can chop it up like crazy.