Well as the Title Assumes that Intel 8th Gen Processors Are only 30% Faster than 7th Generation, Yes is true. Recently in Computex 2017, Intel displayed their 8th-Gen Processors Coffee Lake processors and officially said that the Coffe Lake Processors are quite Faster than 7th Gen Processors. The Company also bought a Laptop which featured 8th Gen Processor.

What Intel said about their 8th Gen Processors.

8th Gen Intel Core processor: As we move toward the next generation of computing, Intel also shared its commitment to deliver 8th generational Intel Core processor-based devices by the holiday season, boasting more than 30 percent improvement in performance versus the 7 Gen Intel Core processor.2

Based on SYSmark* 2014 v1.5 (Windows Desktop Application Performance). Comparing 7th Gen i7-7500U, PL1=15W TDP, 2C4T, Turbo up to 3.5GHz, Memory: 2x4GB DDR4-2133, vs. Estimates for 8th Gen Core i7: PL1=15W TDP, 4C8T, Turbo up to 4 GHz, Memory: 2x4GB DDR4-2400, Storage: Intel SSD, Windows* 10 RS2. Power policy assumptions: AC mode. Note: Kaby Lake U42 performance estimates are Pre-Silicon and are subject to change. Pre-Si projections have +/- 7% margin of error.

projections have a +/- 7% margin of error, Actually they didn’t do final test this means that there would be like 25-30% Performance increase.

The Intel 8th Gen Processors would be soon In market, No Price has been stated by Intel Yet but it would be quite expensive.