3ds Max Gpu vs Cpu

[Sartaknight]

Hello LTT Community,

I'm having my share of doubt with how the rendering engine works in the Vray render of 3ds max. Y understand that there is RT (Gpu) and Adv (Cpu) rendering in Vray, and everywhere I read about this, people recommend the RT Vray because it uses the Gpu, which is supposed to be much faster. 

Anyway, my question is, asuming this id true, and that I should buy a Gpu over a Cpu for this kind of work; what really do I need a Cpu for then?

If I didnt make myself clear please ask, I just want to solve this

[Tryekk]

Well generally for rendering the CPU and the RAM are the primary components. The amount of cores in a CPU will make a huge difference to your render times.

However using GPU acceleration to assist the CPU when rendering will also really help to speed up the render times.

This will utilise the CUDA cores in your GPU(s) which means the more CUDA cores you have the faster your render times will be.

So both components are useful at least for rendering, but primarily the CPU and RAM are more important than the GPU in my experience.

[Sartaknight]

21 minutes ago, Tryekk said:

Well generally for rendering the CPU and the RAM are the primary components. The amount of cores in a CPU will make a huge difference to your render times.

However using GPU acceleration to assist the CPU when rendering will also really help to speed up the render times.

This will utilise the CUDA cores in your GPU(s) which means the more CUDA cores you have the faster your render times will be.

So both components are useful at least for rendering, but primarily the CPU and RAM are more important than the GPU in my experience.

How can I configure my Vray to use Cpu, and Gpu as "assist"? Or does it already work like that?

[Tryekk]

10 minutes ago, Sartaknight said:

How can I configure my Vray to use Cpu, and Gpu as "assist"? Or does it already work like that?

You can use 'Vray RT' will utilise your GPU for ray tracing calculations; taking the load off of your CPU as GPUs are designed for this sort of thing and will be much faster than your CPU will be. This can be known simply as 'GPU acceleration'.

 

Go into the Vray RT settings and change the engine type to CUDA if you are using an Nvidia card or OpenCL if you are using an AMD card.

 

This should help improve render times as a lot of the load will be taken off of the CPU and the calculations will be performed by the GPU instead.

[Sartaknight]

20 minutes ago, Tryekk said:

You can use 'Vray RT' will utilise your GPU for ray tracing calculations; taking the load off of your CPU as GPUs are designed for this sort of thing and will be much faster than your CPU will be. This can be known simply as 'GPU acceleration'.

 

Go into the Vray RT settings and change the engine type to CUDA if you are using an Nvidia card or OpenCL if you are using an AMD card.

 

This should help improve render times as a lot of the load will be taken off of the CPU and the calculations will be performed by the GPU instead.

Figuring I have a 6900k and a 750ti (this is hypothetic), should I use Adv and be done with it, or simply buy a better Gpu and use Rt?

[Tryekk]

12 minutes ago, Sartaknight said:

Figuring I have a 6900k and a 750ti (this is hypothetic), should I use Adv and be done with it, or simply buy a better Gpu and use Rt?

The 750ti only has 640 CUDA cores.

You can get a GTX 960, which has 1024 CUDA cores for around £100 (UK) second hand.

So if you were going to use RT then upgrading to a decent amount of CUDA cores would not cost a ridiculous amount of money.

However with your current config adv would probably end up being faster than using your GPU as an assist as your current CPU is probably better off doing all of the work itself. Your current GPU could end up causing a bottleneck.

 

I'd say it's best to just compare the two against each other and see what works best for you and then consider whether to upgrade or not.

[Sartaknight]

18 minutes ago, Tryekk said:

The 750ti only has 640 CUDA cores.

You can get a GTX 960, which has 1024 CUDA cores for around £100 (UK) second hand.

So if you were going to use RT then upgrading to a decent amount of CUDA cores would not cost a ridiculous amount of money.

However with your current config adv would probably end up being faster than using your GPU as an assist as your current CPU is probably better off doing all of the work itself. Your current GPU could end up causing a bottleneck.

 

I'd say it's best to just compare the two against each other and see what works best for you and then consider whether to upgrade or not.

Thanks man, I appreciate the help.