# enable hyperthreading on DR machine

**URL:** <https://forums.chaos.com/t/enable-hyperthreading-on-dr-machine/13165>\
**Category:** General\
**Created:** [December 16, 2006, 10:35pm UTC](https://forums.chaos.com/t/enable-hyperthreading-on-dr-machine/13165 "2006-12-16T22:35:16Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![bisenberger](https://avatars.discourse-cdn.com/v4/letter/b/d9b06d/32.png) [@bisenberger](https://forums.chaos.com/u/bisenberger)\
**Post date:** [December 16, 2006, 10:35pm UTC](https://forums.chaos.com/t/enable-hyperthreading-on-dr-machine/13165/1 "2006-12-16T22:35:16Z")

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I’m using VRay DR on a computer that has hyper-threading, but the hyper-threading is not being utilized. Is there a way to activate hyper-threading on a DR system?

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**Author:** ![Da\_elf](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/da_elf/32/44038_2.png) [@Da\_elf](https://forums.chaos.com/u/Da_elf)\
**Post date:** [December 16, 2006, 11:38pm UTC](https://forums.chaos.com/t/enable-hyperthreading-on-dr-machine/13165/2 "2006-12-16T23:38:28Z")

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HT is usually set up in the bios. its not something that DR should be turning off or anything like that.

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**Author:** ![bisenberger](https://avatars.discourse-cdn.com/v4/letter/b/d9b06d/32.png) [@bisenberger](https://forums.chaos.com/u/bisenberger)\
**Post date:** [December 16, 2006, 11:41pm UTC](https://forums.chaos.com/t/enable-hyperthreading-on-dr-machine/13165/3 "2006-12-16T23:41:55Z")

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SEE WORK AROUND THIRD REPLY DOWN :?

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**Author:** ![Da\_elf](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/da_elf/32/44038_2.png) [@Da\_elf](https://forums.chaos.com/u/Da_elf)\
**Post date:** [December 17, 2006, 12:38am UTC](https://forums.chaos.com/t/enable-hyperthreading-on-dr-machine/13165/4 "2006-12-17T00:38:00Z")

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i think displacement has a problem with multiprocessors…i cant remember

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**Author:** ![neoVisual](https://avatars.discourse-cdn.com/v4/letter/n/e99b99/32.png) [@neoVisual](https://forums.chaos.com/u/neoVisual)\
**Post date:** [December 17, 2006, 1:48pm UTC](https://forums.chaos.com/t/enable-hyperthreading-on-dr-machine/13165/5 "2006-12-17T13:48:50Z")

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If you have MAX9 you must write something into max listener window to tell max about using more than 1 CPU (virtual or physical)

search here for MAX9 and Vray licence issue

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**Author:** ![bisenberger](https://avatars.discourse-cdn.com/v4/letter/b/d9b06d/32.png) [@bisenberger](https://forums.chaos.com/u/bisenberger)\
**Post date:** [December 17, 2006, 10:44pm UTC](https://forums.chaos.com/t/enable-hyperthreading-on-dr-machine/13165/6 "2006-12-17T22:44:24Z")

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The work around is detailed on page 2 of this thread:  
[http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=17177&postdays=0&postorder=asc&start=25](http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=17177&postdays=0&postorder=asc&start=25)

tryharder wrote:

> How can I use the MaxScript property. Thanks for some deeper step by step explanation.

Vlado wrote:

> make V-Ray the current renderer, open the MaxScript listener (F11), type “renderers.current.system\_numThreads=2” without the quotes and press Enter.

Thanks neoVisual