Meanwhile I have been working a few weeks on my new machine, that has a x79 saubertooth motherboard with a i7-3930K running at a 33 multiplier.
Initially with 32 GB but since today with 64 GB. Memory was often close to 32 GB so I felt it might help adding another 32 GB. And for 220 euro you can't really go wrong of course.
Below I will add my experiences. They all are about previewing panoramas in the editor. Rendering is not something I worry about much.
- The machine's bottleneck now is the CPU and the GPU and their communication. Loading projects from SSD was already fast and I don't see much pagefile I/O anymore. CPU and GPU are not running at 100% though. It used to be that they both were at 70%, now the CPU seems to be a busier (hitting 100% more often) and the GPU a few % less. I assume the % below 100% are partly caused by the 128 bit transfer of data between RAM and GPU-memory.
-Maybe unrelated, but by changing the cachedivision-setting from auto to 24 MB I am able to work on two panoramas in editor at the same time, where I had a lot of problems/chrashes lately. Keeping it on auto while having 64 GB still gives crashes so it seems like the settings is the positive factor.
Running for a week with an extra 32 GB, totall of 64 GB. Mixed feelings.
32 GB does not cost much and certainly gives you the ability to load more stuff into memory without heavy pagefile I/O. So that is a good thing. It also means I can load more panoramas into their editor and start a preview run to see how they might look after rendering.
There seems however no speed difference going on. Problably this is because I already had a PCI-SSD in use for the temp-directory and pagefile. So not much to gain anymore.
I run preview sometimes with GPU processing, sometimes without.
With GPU processing and compatibility for old graphics cards, I notice a 99/46% CPU/GPu processing percentage.
With GPU processing without compatibility for old graphics cards, I see a 80/70% CPU/GPu processing percentage.
Without GPU processing the CPu runs on 100% again.
I have no times for how long previewing takes in these cases. Too long it is anyhow. I often go away from the computer to do something else. The good thing of 64 GB is I can bundle more editors together to do their preview so stay away longer each time.
Geekbench is telling me it is on 17004 http://browser.primatelabs.com/geekbench2/2186831
Problably a new GPU will make the GPU processing without compatibility for old graphics cards the fastest overall option. looking already for the GTX Titan. 4 times as expensive as adding 32 GB but hopefully of more influence to the speed of preview.