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Q: Regarding Hyperthreading
I noticed that Reason 7 only uses 4 cores of my cpu which has 4cores and 4 logical cores.
Is there a Reason why hyperthreading is not supported?

Also since Hyperthreading is not uspported atm. Should i disable it from Bios to gain some more cpu cycles or let it be?

skatebird:

Reason chooses the number of cores it will use based on what will work best on most systems. Our measurements have shown that the use of hyperthreads will not improve performance and we therefore choose to not use that number of core per default. However, if you would like to try to let Reason use more cores on your system we support configuration of how many cores Reason uses with a Multicore configuration file. Contact support and they will help you.

skatebird:

Peter S, who has done a lot of this coding, writes:

One physical core has two logical cores (a logical core is a hyper thread). I see no abiguity. The audio rendering is run on the number of audio rendering threads that Reason chooses. That number is the number of physical cores - 1. Exception is that 2 is chosen when there are only two physical cores.
The other reason threads such as background calculations, GUI, MIDI etc is entirely scheduled by the OS and will use hyperthreads when OS decides that. The point of not choosing too many threads for the audio rendering is that if two audio rendering threads run on the same physical core on two logical cores (hyper threads) the two audio rendering threads will compete for the cores resources such as cache. So will choose the number of audio rendering threads so the OS has a chance to schedule them on different physical cores.