Number of Instances 2 or 4?

Hi, I just got the 2.66GHz Quad-Core Intel Xeon "Nehalem" processor MacPro. Do I select the Number of Instances to 2 or 4? Thanks

I've noticed that all of my processors are active during processing, no matter what the number of Qmaster instances are. The instances are not the cores that are in use, but rather how many parallel process are running.
Example:
If you have a 4 core Mac and set it to 2 instances, then you will see in the batch monitor window that two process are running, but that all cores are processing the information. You can see this if you have a system utility like menu meters running, which shows how your cores are being used.
The advantage here is that the more processes that are running in parallel, more of the head room for each processor is consumed, (till it reaches 100% for each processor.) Qmaster will also split up a single file into many mini files, so that different parts of the same file can be worked on in parallel, so that the single file will finish sooner, than when it is encoded from start to finish as a single encode, (like when you select "This computer" under the submit button of compressor, rather than using a cluster.
I have two 4 core Mac's one is a G5/quad and the other is an Intel 3.0Ghz 4 core. I run both in Qmaster with 3 instances, which puts it just under 100% of all cores headroom being consumed and works just fine, finishing project very quickly.

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