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CPU definitely then when you get the urge to further improve performance add a cheap GTX 1060 6GB GPU (less than 250 EURO).
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I second Bill. CPU definitely: Despite it's eight cores, it is actually slower than even recent quad-core, non-hyperthreadable i5 CPUs, let alone a quad-core i7 (as determined by the MPEG-2 DVD export score with the MPE set to software-only mode in PPBM). In fact, it is almost as slow as some newer dual-core Intel CPUs.
In addition, most GPU-accelerated workflows use a combination of high CPU and high GPU usage. Thus, a balanced system is critical. Otherwise, if you upgrade the GPU without also upgrading the CPU, what would happen there would be the GPU occasionally sitting idle waiting for the CPU to catch up. And remember, no GPU upgrade can compensate for a weak CPU!
Unfortunately, any CPU upgrade in your particular system will also require a motherboard and memory upgrade. Too bad memory prices are astronomically expensive right now, and may not come down for a year. This is because AM3+ is a dead-end platform where no new CPUs have been introduced for that CPU socket (and is now effectively EOL), making your current FX-8320 part of the latest series of CPUs compatible with AM3+, and any drop-in upgrade to the fastest available AM3+ CPU is priced much higher than any tangible performance benefit justifies.
I understand, thank you very much for your explanation !