In a leaked slide Intel puts Core i9-10900K 30% higher than Core i9-9900K in SPECint_rate_base2006_IC16.0 benchmark.
Intel Core i9-10900K 2% to 30% faster than Core i9-9900K
A picture published originally by ITHome and shared by Tom’s Hardware demonstrates the performance of Intel’s upcoming 10-core and 20-thread Comet Lake-S CPU known as Core i9-10900K against Coffee Lake-R Core i9-9900K.
Both CPUs were reportedly tested with all security patches available on 4th November 2019. In benchmark such as Cinebench R15, the 10900K is up to 26% faster than 9900K. Based on all these results, the CPU is on average 13% faster than the current-gen CPU.
The number of leaks suggests that the 10th Gen Core series are very close. In fact, Intel announced a press conference for January 6th. We might be hearing more about Core i9-10900K on that date. 
| Intel 10th Gen Core Comet Lake-S Specifications (Jan 1st) | ||||||
|---|---|---|---|---|---|---|
| Core SKU | Cores / Threads | Base Clock | Single Core Turbo | Max Turbo 3.0 | All Core Turbo | TDP |
| i9-10900K | ||||||
| i9-10900 | ||||||
| i7-10700K | ||||||
| i7-10700 | ||||||
| i5-10600K | NA | |||||
| i5-10600 | NA | |||||
| i5-10500 | NA | |||||
| i5-10400 | NA | |||||
| i3-10320 | NA | |||||
| i3-10300 | NA | |||||
| i3-10100 | NA | |||||
| * Intel Thermal Velocity Boost (single core / all core): 10900K: 5.3/4.9 GHz; 10900: 5.1/4.6 GHz | ||||||
The specifications of Intel’s 10th Gen Core series were leaked by Informatica Cero just few days ago:
Source: ITHome via Tom’s Hardware
