How does the CPU affect render performance?

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How does the CPU affect render performance?
« on: July 20, 2015, 04:57:29 pm »
July 20, 2015, 04:57:29 pm

I'm going to build a new workstation for a friend (he works for a architecture firm), he already has a titan black for his new workstation, but I'm not sure which CPU I should advice him to get.

Currently I have the i7-4790K, as this is the best haswell cpu at the moment, however I could also go with the 2011-3 platform and get the i7-5820K, which is a hexacore but has a lower clockspeed.

So my question is, does lumion depend on single core performance or does it utilize multiple cores, that is more then 4?

I'm also curious as to whether lumion would benefit from the use of ECC memory? If so I should be looking for a xeon CPU instead of an i7


Re: How does the CPU affect render performance?
« Reply #1 on: July 21, 2015, 12:44:43 am »
July 21, 2015, 12:44:43 am
Hi Jb

For Lumion the PC only requires a CPU that can process the data communications from GPU to system without slowing down the GPU.  Number of cores are not important, except for multi-tasking with Lumion and other applications open.

Please refer to our forum guide: LUMION 5: Minimum hardware requirements.

Most work (about 90%) is done on the GPU. During the render process the CPU is used some more for some later stages, mainly with the conversion and compression to MP4 for videos.

The  i7-4790K has a Passmark of 11238, so is above the Recommended Guidelines. 

The  i7-5820K has a Passmark of 12985.

Consideration for employing the more recent 2011-3 socket platform would be about investing in hardware that is more recent than the older Haswell platform, and would allow for more options in future upgrades of CPU, RAM etc.

ECC is not important or critical to Lumion.

If the friend is going to use other CAD and modelling software on the same workstation, then you may want to consider better performing CPU's and memory for that reason.

The highest clocked CPU with fastest RAM and supported by a motherboard that provides for 40+ data lanes (the newer gaming based ones) will impact on FPS when building scenes, and also best support the more powerful Titan series.