This was the processor that I had in my very first DIY PC, back when I had a well-worn softbound copy of Building a PC for Dummies, 4th Edition which I read voraciously. It is astounding just how far CPU performance and power efficiency has progressed in these last 15 years since the time of the Pentium 4 640. Now, one single core of a fanless Surface 3 using a diminutive Intel Atom Z8700 with an SDP of a mere 2 W is nearly as fast as my Pentium 4 was with its toasty, power-thirsty TDP of 84W. With all four cores engaged, this otherwise unassuming Atom is nearly three times as fast as my Pentium 4 was. And as for the latest generation Kaby Lake fanless Core M/Y-series Core i processors? One core alone in the top-of-the-line Core i7-7Y75 is three times as fast as my Pentium 4. With all threads and cores utilized, a fanless Core i7-7Y75 is six times as fast as my Pentium 4. Now, that is progress!