Really glad to hear it is working for you now.    Nothing like the thrill of multiple cores tearing through a render :-)

As I understand it, you might get a further increase by changing the number of threads to 4 even on your current processor.  Whether you get an increase in speed depends on the memory in your system and the memory requirements of the scene.  When you get a slow day then it might be worth trying it with a scene to see if it makes a noticable improvement.

Info for when you upgrade:  I'm running a quad core with 2 Gig of RAM on Windows Vista.  I have the number of threads set to 4, but I've found that having the Separate Process box unchecked works best for me.

Just realised that I have the manual in PDF format here, so here's the relevant part on page 26:

**

Render Process Settings**

?

renders in a separate process on the CPU, and vice versa. This feature is disabled by

default. For more information on Rendering in a Separate Process, see

Technology” on page 352

***Separate Process: Checking the **Separate Process box enables running FireFly“FireFly.*****?

you can take advantage of multi-threaded rendering by setting the

Threads

dual-core system, you may see increased benefit from setting the number of threads to

four, rather than just two. However, if you have a single-processor and single-core

system, we recommend that you set the number of threads to one, as the increased

memory demand of running parallel threads may offset the performance benefits. For

more information on multi-threaded rendering, see

****Number of Threads: If you have a multi-processor and/or multi-core hardware system,**Number ofslider to a value greater than one. Even if your system is a dual-processor or“FireFly Technology” on page 352.******NOTE

EVEN WITH A MULTI-PROCESSOR OR MULTI-CORE SYSTEM, IF YOU ARE RENDERING A

HIGHLY DETAILED, MEMORY INTENSIVE SCENE YOU MAY FIND THAT YOU HAVE BETTER

RESULTS BY SCALING BACK THE NUMBER OF THREADS IN ORDER TO REDUCE MEMORY

OVERHEAD. WE RECOMMEND RENDERING YOUR SCENE WITH FOUR THREADS, AND IF YOU

ARE UNSATISFIED WITH THE PERFORMANCE RESULTS, OR IF THE RENDER FAILS TO

COMPLETE, THEN REDUCE THE NUMBER OF THREADS.

i7 5960X, 32GB RAM, GTX 1080Ti, GTX 980 Ti, Windows 10 Professional.  Running Daz Studio 4.11, Poser 11, Vue Inf 7, Photoshop CS4