The i7 lost HT but gained 2 real cores, which will be faster in practice. The i7 has the same amount of cache as its predecessor and the i9 has more. 9-series

The i7 lost HT but gained 2 real cores, which will be faster in practice. The i7 has the same amount of cache as its predecessor and the i9 has more. 9-series has hardware fixes for Meltdown variant 3 as well as the L1 terminal fault fix.