I have been looking at purchasing an iMac 27" for photo and video editing. I'm wondering if the 9th-gen Core i9 8-core processor is worth the upgrade cost compared to the 9th-gen Core i5 6-core processor? Will the i9 processor throttle heavily due to overheating under heavy load? Should I stick with the i5 and spend the money on either the graphics card upgrade or more SSD storage instead? I'm looking for advice from those with personal experience with the i9 processor.