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You don't need to have a dedicated video card to edit and produce videos, but having the right one will make producing much faster if you're using H.264 (AVC) or H.265 (HEVC) encoding. It won't help at all if you're producing to WMV or MPEG-2 for DVDs.
A good GPU can help significantly, even for MPEG2, there is always the decoding side so it depends heavily what the source video is that the user wants to create a MPEG2 format for DVD from. Factors of 1.5X overall encode improvement can be achieved which is pretty substantial.
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As seen in this nVidia table, the GTX1060 has the same supported formats as the RTX series with the exception of HEVC B-frame support. PD doesn't actually support that feature at this time so you won't miss out by having the older GTX card.
A little misleading statement, the table only refers to formats, not necessarily format specifics. For instance, the GTX can support H.264/60i formats in PD while the RTX can not. Important for those users that need that capability.
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Thanks, and to all others who posted. It seems impossible to get hold of a decent video card in the UK at the moment, and they're going for silly prices on Ebay. My current one has an AMD Radeo HD 6450 which seems to be doing the job, so I'll just transfer that to the new computer for now until I can find an updated one. He's going to look for the relevant Intel CPU anyway.
You might look at EVGA. For current models in production, they let you get on a wait list and you have 8 hrs to accept once your turn in the queue. I've had several users that have been successful with that approach. Price in USA is not inflated with approach.
Jeff