Z820 slow video rendering

Hi,
I work in a video production studio that is primarily Mac-oriented. We have two z820 workstations we want to incorporate into our workflows, and have upgraded them with 32gb RAM, Zturbo SSDs and Nvidia Quadro 5000 GPUs. We are hoping to get these stations to render as quickly or more quickly than the standard 2014 iMacs we have in the studio, but so far the machines are rendering a 4.5 minute 5K video sequence in about 12 minutes, as opposed to the Mac's 3 minutes.
I was wondering if anyone on this forum had famliarity with video editing (we use Adobe Premiere Pro) and GPU maximization. We're trying to get the z820s to at least match their Mac counterparts.
Currently the windows machines beat the Macs in transcoding and ingesting footage, going about 5x faster while transcoding Quicktime or R3D files into 1920 x 1080 HD quicktime, so I'm pretty sure they have the processing power to get the renders we want, i'm just not sure what video card/computer settings I might need to mess with to get there.
Any and all help is much appreciated!
Thanks,
Zach

@ZFinch
Hi,
I have had some more time to think about your rendering issue. Please post your hardware configuration and Product Number.
How large are the data objects?
Think of your rendering process like a single transaction much like when you do an online query to a server. If just one of your transactions are slow then you may have a data object problem. Just for now temporarily assume that the hardware platform is stable but you can test that assumption by running some diagnostics if you so desire.
If all of the transactions are slow then think of the time line for the transaction. Typically the time line looking at the transaction linearly, is made up of three major queuing components: CPU, memory and I/O. You can start the Windows resource monitor before doing the rendering process and then look at the recorded results to determine where the bottlenecks reside. Are all of the expected number of processors and threads running at 100%? Is the memory utilization at maximum for the 32 GB? Are you seeking a lot of hard faults? Look at the disk queue length and I/O activity. What do you see? Historically with transactions, I/O is the biggest bottleneck.
What are your biggest performance bottlenecks with your rendering process? Once you give me some more information then I can make some more suggestions. The above graphics that I had referenced may not solve your issue.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad, HP Chromebook 11
Custom i7-4770k,Z-87, 8GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650,GTX 760
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