December 12, 2019, 05:36:04 AM
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Topic: Which software/hardware do you use for molecule modeling that give results?  (Read 115 times)

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Offline d0_0b

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I’m currently using Chemdoodle 3-d but it’s not very powerful and can only handle a few thousand connections rendered over a quarter of a day to get very little information back. This is on an i7 with 16 gigs of ram.

Maybe I’ve made the beginners error of not rendering in smaller steps as I go.

Can you recommend anything I can use to process my molecule set so I can get some information back, even if I have to wait all day. I’m happy to remake the molecule as its not complicated. Thank you.

Offline Enthalpy

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About good hardware for ChemDoodle 3D, you should first observe the application when it runs.

You have a multicore machine. Let ChemDoodle run heavily, open the task manager with Ctrl-Alt-Del (for Windows, or find use the local equivalent). Does ChemDoodle use all cores? Does it occupy all the Ram? This tells you if more cores or Ram bring something, or as opposed, if a machine with few cores and faster clock would be better. Check also if ChemDoodle puts heavy load on the graphics card, because Cuda allows science computations on it; software exists to show the workload on the graphics card, whose computing power varies hugely among the models.

The Ram throughput matters generally more for science than the computing power, at a graphics card even more. Try to reduce the Ram clock in the Bios and measure if ChemDoodle gets slower. If the Ram throughput matters, then fast DDR4 is better than slower DDR3 better than DDR2, and more Ram channels are better. You can get used Xeon on socket LGA 2011 for very little money presently, they have 4 channels of up to 2133MHz DDR4 and 2 to 18 cores.

I didn't find quickly whether ChemDoodle uses SIMD instructions (AVX-512, AVX-256, SSE, or long ago MMX). As it puts no requirements nor suggestions on the CPU, probably it doesn't. Then, an old CPU like a Wolfdale is just as good as anything recent.

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