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I don't know, I didn't bother looking at the i7 vs i9, as I have my eyes set on the AMD Ryzen series... seems more value for money...
Admittedly, the i9 still gives better single core performance than the Ryzen 3900x (£412 inc delivery from AMD directly), which is currently the best AMD has to offer until the 3950x comes out later this year, but that's like £700+ and I don't think us mere mortals would see any real benefit... maybe it will, but it ain't worth the extra £300...
I know most 3D stuff uses single core, but the multi cores performance the Ryzen gives simply blows the i9 out of the water making the slightly inferior single core performance worth the compromise. And imagine how much joy this would bring when working on a heavy video project!
Is the price/performance ratio worth it with i9 now?
When I built my highh spec machine a few years ago I seem to remember that I would have been paying about £500 more than a decent i7 for about 5% gain in performance.