Upgrade Motherboard/CPU on Zbook 15u G3?

[chris_agu]

Hi Community - I am new to HP computers and got a Zbook 15u G3 with an i7 6500 2.3ghz that only has two cores. I do video editing and although the machine is able to "handle" the 4k footage I work it.. it is jittery at best and have to downscale in editing ALOT to just see play back (premiere lets you preview in low res as you edit). But even that playback freezes and drops frames. Figured with the AMD card it would give me more performance..nope.. so I moved all my source footage to an upgraded 1TB SSD M.2 NVE.. still a negligable boost in performance. I am boosted the RAM from 16GB to 32 this week, but it is the processor that is getting taxed. There is a known issue with Adobe Premiere using the internal Intel card opposed to the discreet AMD card and I did apply that fix and it did not help. 

My next step would be replacing the 2 core CPU (I can almost slap myself for not looking at the core specs, I just thought all or most i7's were four core processors). I see a couple motherboards used out there that have the four core i7-6280HQ chips on them. I was wondering if this would even work in my computer. My machine is HP Part Number V1H64UT .. looking to get this thing four cores...somehow... thanks for any guidance you can offer (I might just purchase a new machine, but man would love to avoid that since I beefed up everything on this one I can think of alraedy!). Thank you! 

[banhien]

@chris_agu 

Not many options for the series as shown on page 72 of the following manual

    http://h10032.www1.hp.com/ctg/Manual/c04887250.pdf

You have to look at different series.

Regards.

[chris_agu]

Hi thanks for the reply so based on that manual there are no four core CPUs at the time it was published. I am wondering if sense then and perhaps the newer models were released a four core based motherboard would be able to work in this chassis. Spending $500  on a used MB/CPU is way cheaper then dropping several thousand on a new machine 

Thanks