Is my old (2012) CPU likely bottlenecking my more modern (2017) GPU in video editing/rendering?

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I'm still rocking a Core i5 3470K that I bought in 2012. I don't really need to have the newest most powerful gaming system any more as I now use Shadow cloud gaming service for that, but I wanted a little extra power for editing 4K video which I do a lot.

To this end, I decided to upgrade my graphics card (an ageing Radeon 7850 2GB) to a more modern GPU (an RX 580 8GB), but although I did notice an improvement in playing VR games locally, I didn't really feel like it was much beefier when editing videos in Adobe Premiere Pro.

Could it be that my older CPU is bottlenecking any performance boost the newer GPU might be giving me? Or even that my system (which frequently idles around 40C) might be throttling due to insuffician cooling (I'm just using the crappy stock Intel cooler that came with my CPU!)??

If you were me, what would you do - stick with the older Radeon 7850 until I have the money to upgrade my ENTIRE system, or keep my RX 580 and maybe look at getting a better cooling system like a liquid AIO or similar??
 
Run task manager and have a look at whats pegged to 100% while rendering/video editing, that cpu was never that great in the first place and its terribly dated with four threads.
 
Your CPU and if a mechanical drive is part of the video editing process (except for exporting at the end which shouldn't count as the "time taken actually working on it") will be the two main culprits. 8GB RAM may not help much either and you could check by inspecting Task Manager while working now and then and seeing if the page file is being used due to lack of physical memory.

You should really keep the 580 given the GPU scarcity situation, absolutely no reason to sell that first. When you have the funds, upgrade the rest of your system, and try with the 580 before considering upgrading it as well.
 
What programs do you use for video editing, as some like Resolve will get up GPU power ! Specially at 4k but as mentioned above ... GPUs cost a lot !

If your doing this for a living then 3900X is a good start !
 
An 11400F + B560 would give you a really nice upgrade without costing much but in terms of the GPU now is probably not the best time to buy as they're overpriced / out of stock due to the crypto boom.
 
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