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> on the high-end side there is still no 5GHz and there is little single-core improvement since 2004, since the Pentium 4 3GHz.

This isn't true. There's easily a single thread win, clock-for-clock, of 2-3x over this period.




Single core performance comparision: https://www.cpubenchmark.net/singleThread.html

   Intel Core i3-4370 @ 3.80GHz     2,215 pts 
   Intel Pentium 4    @ 3.80GHz       822 pts
But to make a fair comparison, one would have to throttle the memory to the speed of a 2004 memory chip. Then the CPU single core performance increase will be a lot less. Also the Pentium 4 architecture was a crossroad and Intel switched back to Pentium 3/M for Core. So a better comparision is the fastest Pentium M with a modern Core CPU.

  Intel Core i7-4760HQ @ 2.10GHz    1,922 pts
  Intel Pentium M      @ 2.10GHz      660 pts
Again, the memory speed increased a lot since then, so for a fair comparison, one would have to throttle the memory chip.

The Atom 330 vs current gen Celeron (haven't found J3060, but his bigger brother J1900):

  Intel Celeron J1900  @ 1.99GHz      530 pts   (10 W)
  Intel Celeron J3060  @ 1.60GHz        ? pts   ( 6 W)
  Intel Atom 330       @ 1.60GHz      251 pts   ( 8 W)
The performance increase of the cheapest Intel CPU hasn't increased that much since 2008, as I said.




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