20-core Xeon E5-2698 V4 ($405 on eBay)
22-core Xeon E5-2699 v4 ($300 on eBay)
28-core Xeon QL1F 8176 ES Platinum ($488 on eBay)
They will all beat the 8-core i9 in almost any multicore test.
For $520 you can have a whole server with 40 cores (4x E7-4860) and 128GB RAM:
https://www.ebay.com/itm/292944891997
or 64GB RAM $100 cheaper:
https://www.ebay.com/itm/233201237130
20-core Xeon E5-2698 V4 ($405 on eBay)
22-core Xeon E5-2699 v4 ($300 on eBay)
28-core Xeon QL1F 8176 ES Platinum ($488 on eBay)
They will all beat the 8-core i9 in almost any multicore test.
For $520 you can have a whole server with 40 cores (4x E7-4860) and 128GB RAM:
https://www.ebay.com/itm/292944891997
or 64GB RAM $100 cheaper:
https://www.ebay.com/itm/233201237130