A few years and versions ago I experienced DXO Optics for the first time. The experience was GREAT. You can catch my pictures on Flickr and I can say that each one was processed with DXO Optics. I am the photographer of the current Trump photo on Wikipedia and that was processed with DXO Optics. Many of those pictures were at a higher ISO than many could stomach, but DXO seemed to process them well.
At the time I got DXO for the first time I had a premium HP I-7 laptop with a GEForce graphics card and 16 gb of ram. Nothing can stop this thing and it seemed to zoom through Lightroom quite effortlessly. Than I loaded DXO on it and it took 3+ minutes to process any PRIME noise reduction on it. The laptop became very hot, the fan howled like I was about to break the thing, etc.
Not wanting to give up I found a well discounted Acer Predator on Ebay with 4470 processor and 32gb of ram. This was originally designed as a gaming machine and at that time its specs could not be beat. Now each photo took a minute and a half. Not great, but better than the laptop and no scary howling of fans out of the machine.
At some point DXO redesigned its program to allow for OPENGL. I was excited and got a discount AMD graphics card. I think it was an R7 graphics card because in many tests AMD exceled at OPENGL. The processing times then sank to a minute. This was acceptable to me and a long way we came from 3+ minute DXO Prime times.
Now today I have a Dell Precision M7710 Mobile WorkStation with Xeon 1545 and 64 gb of ram. It is a 17 inch laptop. The processing times are slightly less than the Acer Predator, but that's pretty good because I can fit the M7710 in a big laptop bag and the Acer Predator is a beast and cant be traveled with in the same way. The Dell also doesn't operate with a lot of drama as it was designed to be a workstation. Doesn't heat up and howl like the old HP. A more civilized machine.
Currently the most powerful mobile solution on the market is the Origin EON 17 SLX with 6700k processor. I got the Dell because the Dell is really meant as a laptop and its easier to live with. It also comes with 3 year on-site warranty repair. The Origin is a mobile beast designed as a desktop replacement meaning its supposed to live life on a desk or a table, but not like a laptop where you can drop by Starbucks or put on your lap for hours of surfing. It will only last about an hour or two before that's it.
Fortunately for most DXO Optics fans now on Ebay are refurbished HP and Dell desktops under $1000 with 6700k processors. Probably those will process the PRIME photos in about 40 seconds a piece. Also on Ebay for those with a larger budget is Dell Precision workstations with 14+ cores I saw for $3500. These are refurb units which carry the same 3 year warranty.
For myself, I needed a mobile solution because I'm on the road extensively. I would process a few photos on the HP laptop and when I got back home I would hammer it through on the Acer Predator.
So my suggestions for those who absolutely need a mobile solution like myself and you found Lightroom is not an acceptable alternative I can only suggest two laptops which are the Dell M7710 with Xeon processor and maxed out ram OR the Origin EON 17 with 6700k desktop processor, maxed out ram, etc. The Origin laptop WILL pound through those files probably 30-40 seconds per PRIME file. What makes the Origin so great is that it uses both a desktop processor and a desktop gpu in a portable package. Well, its 11 pounds and the power supply is 4 lbs. So its more portable than a desktop but less portable than a notebook/laptop, however, it can be carted around in a carry on. At the end of the day, I found myself going for the M7710 as I could live with it.
I have discovered when it comes to DXO processing times that first and foremost the processor matters most. Next comes the graphics card, memory, etc. An SSD drive does help to solve the bottlenecks that naturally occur with spinner drives.
As for dual cpu systems like those Xeon systems or dual gpu systems I believe that the software has to be designed for it. You can send a message or call up DXO to get an exact determination. Their customer service will know. So if I was going to get a dual Xeon or one big powerful single Xeon I would go with the single Xeon solution.
I believe the BEST solution for DXO is a single cpu modern Xeon system with a lot of cores. I looked up the $3500 Dell Precision Xeon system on CPU benchmark and its 14 core Xeon processor was rated at about 16000 whereas the 6700k is at about 11000. So probably that beast can pound through a PRIME file at less than 30 seconds per.
Now keep in mind my main camera is the Canon 5DSR and its RAW files are 50 megabytes. These are not easy files for the DXO program. So when I speak of processing times I am talking about the largest raw files out there for this thing.
For the very busy wedding photographer you might just throw up your hands and stick with Lightroom as DXO has never been that quick. For those who cant do without fortunately technology has caught up and we are now seeing very tolerable processing times of under 1 minute with the best laptops and under 40 seconds for high end desktops.