30 years of CPUs at Tom’s Hardware — looking back on three decades of processors, from the Pentium II to…

(Image credit: Tom's Hardware) We're celebrating the 30th anniversary of Tom's Hardware. Since the beginning of Tom’s Hardware in 1996, we’ve been covering CPUs. Over the course of the past 30 years, we’ve maintained a comprehensive list of the best CPUs for gaming by reviewing each new release, and we’ve compiled thousands of data points spanning years to compile our CPU benchmark hierarchy. From the Pentium II and the introduction of Dual Data Rate memory to dual 3D V-Cache CPUs, Tom’s Hardware has been there for it all.It’s time to look back, not just on Tom’s Hardware’s role in the world of CPUs over the past 30 years, but on the broader CPU market. Earth-shattering releases at a given time turned out to be footnotes in hindsight, and bubbling competition that seemed like no real threat turned into seismic shifts in the AMD vs. Intel battle. Hopefully, along the way, we’ll see some reflections of what’s going on in the world of CPUs today.This is a celebration of 30 years of CPU coverage here at Tom’s Hardware, a history lesson about how the AMD and Intel of yesteryear arrived at the positions they’re in today, and a retrospective of the CPUs that stood the test of time against the refreshes that faded into obscurity just as soon as they were released. We hope you enjoy it.Ruffling feathers from day one (1996 - 1998)Ruffling feathers from day one (1996 - 1998) (Image credit: Tom's Hardware)Like much of the early internet, the true beginnings of Tom’s Hardware (or, rather, Tom’s Hardware Guide) is difficult to pin down, but the earliest archived article concerns the SoftMenu BIOS, which allowed you to change CPU settings through software rather than physical jumper cables; it should go without saying that this article was from July 1, 1996. There were articles before this one, with the original domain of sysdoc.pair.com going online in February 1996.Tom’s Hardware gained a lot of traction a year later with a CPU review: a look at the Intel Pentium II ‘Klamath’ processor. Swipe to scroll horizontally Table 1: Then and Now: Pentium II Row 0 - Cell 0 Pentium II Klamath Core Ultra 7 270K Plus Ryzen 9 9950X Transistors 7.5 million 17.8 billion 16.63 billion Node 350 nm 3 nm 4 nm Die size 203 mm² 243 mm² 2 x 70.6 mm² Max clock speed 300 MHz 5.5 GHz 5.7 GHz Price (w/ Inflation) ~$700 (~$1,450) $300 $500 Tom’s Hardware’s founder, Thomas Pabst, had discussed CPUs previously, like in a dense CPU guide published the same year, but the Intel Pentium II review marked a turning point. It was published March 1, 1997, more than two months before Intel launched the Pentium II 80522 (or Klamath). It was not positive: “...since I wouldn't eat [Mad Cow Disease] infected beef, I wouldn't be interested in risking an infection of my computer with this CPU either,” wrote Pabst.The CPU wasn’t officially available, but Pabst was able to test the chip with a pre-release unit shared by two German magazines: C'T Magazin fur Computertechnik and PC Professionell. Following the publication of all three reviews, Intel targeted the two German magazines, threatening to withhold advertising dollars and take legal action against them. Pabst publicized this fiasco and was contacted by The New York Times, which also covered the story. Intel backed down. Pabst later wrote that “...this 'David against Goliath'-incident made Tom's Hardware Guide very famous.”Get Tom's Hardware's best news and in-depth reviews, straight to your inbox.In the following months, Pabst focused on CPUs quite a bit, breaking from the performance-tuning guides and general enthusiast information the website had previously published. The situation with Intel made Pabst a “secret star,” so much so that AMD not only offered Pabst a free review unit of the upcoming K6, but also apparently offered to cover legal fees should Intel pursue the situation further.Although the unofficial review of the Pentium II predates it, the first review that looks most like the technical reviews that have been published on Tom’s Hardware for decades came in April 1997 with a review of the AMD K6, a CPU that established AMD as a true competitor to Intel, claiming Pentium II-like speeds for less money.The performance wasn’t quite on the level of a Pentium II, most notably because the K6 originally arrived at 233 MHz, when 266 MHz was promised. But it was competitive, particularly when compared to the Pentium II 233, and much cheaper. Pabst concluded the review, “All in all I'm sure that this CPU will be very successful… Whoever is contemplating the purchase of an Intel Pentium or Pentium MMX CPU can forget about this now. The AMD K6 is faster and cheaper.” (Image credit: Tom's Hardware)Later that same month, Pabst published a proper review of the Pentium II, now using finalized silicon. In DOS games and the 32-bit Windows NT, Pentium IIs showed a commanding lead over the K6, though the battle on Windows 95 was closer. “The world is back to normal. Intel’s managers can sleep quietly again. The Pentium II shows that Intel is still the leader in the CPU market,” the review concluded.A review of the Cyrix/IBM 6x86MX went live in 1997, as well, showing competitive performance with the K6, but much of the rest of the year was focused elsewhere after the Pentium II/K6 showdown. Looking back, it’s interesting to note the dynamic at play between AMD and Intel, with Pabst using a running gag of referring to Intel as the “Empire,” and competitors like AMD and Cynix as “Rebels.” Although Intel backed away from further action on Pentium II, it wouldn’t be the last time Pabst and Intel butted heads.The Pentium III incident (1999 - 2001)The Pentium III incident (1999 - 2001)The competitive performance of K6 brought AMD into focus as the rival to Intel, which Pabst often described as “almost-monopolistic” at the time. However, AMD really put itself on the map with the release of K7, or as it’s better known, Athlon, in June 1999. In our review, we described it as “a milestone in the whole processor scene,” due in part to AMD’s unique three-way instruction decoder, which allows instructions of variable complexity through all three lanes. Intel’s P6 architecture in Pentium III also had a three-way instruction decoder, but they were segmented based on the complexity of the instruction.We’re still firmly in the single-core era of CPUs here, so an architectural divergence like this, even before testing, represented a goldmine of speed gains. Rather than releasing several variants of silicon sliced up in different ways, as we see with modern CPUs, Intel and AMD refined their chips and released new versions with faster clock speeds. AMD released the Athlon 600 as the fastest chip in the range at 600 MHz first, but less than two months later, it introduced the Athlon 650, and two months after that, the Athlon 700. (Image credit: Tom's Hardware)Intel was caught off guard and quickly introduced the Pentium III 600 to counter AMD. The original Pentium III range, codenamed Katmai, was largely a refinement of Pentium II ‘Deschutes’ chips; both were built using a 250nm node, in fact. In our original Athlon review, we noted instability with the Pentium III 600, suggesting the architecture couldn’t handle such high clock speeds.The original ‘Katmai’ range of Pentium IIIs was short-lived, and later in 1999, Intel introduced a new revision called Coppermine. Coppermine introduced an on-chip L2 cache for Intel, and it was built on a 180nm node, allowing Intel to go from 9.5 million transistors on Katmai to 28 million on Coppermine, as well as push clock speeds up to 733 MHz with the initial range, squeezing out a minor increase over the Athlon 700. Less than two months later, AMD introduced Orion, or Athlon Model 2, which also used a 180nm node and clocked up to 750 MHz. This back and forth of minor clock speed improvements is going to stick with us for at least another half of a decade, so strap in. (Image credit: Tom's Hardware)The goal, of course, was the first 1 GHz CPU, a milestone that AMD claimed for itself in March 2000 with the introduction of the Athlon 1000. Intel had shown a 1 GHz Pentium III, but AMD released a 1 GHz Athlon first. Intel followed shortly after with its first CPU to hit the gigahertz milestone. Intel didn’t want to place second again, so it went to work on the Pentium III 1.13 GHz, which it introduced in July. Swipe to scroll horizontally Table 2: Then and Now: Athlon 1000 (Magnolia) Row 0 - Cell 0 Athlon 1000 Core Ultra 7 270K Plus Ryzen 9 9950X Transistors 22 million 17.8 billion 16.63 billion Node 180 nm 3 nm 4 nm Die size 103 mm² 243 mm² 2 x 70.6 mm² Max clock speed 1 GHz 5.5 GHz 5.7 GHz Price (w/ Inflation) ~$1,300 (~$2,500) $300 $500 Pentium II made Tom’s Hardware a name in the PC industry, but the Pentium III 1.13 GHz gave it a name among enthusiasts. Our review found that the processor wasn’t stable at 1.13 GHz, and less than a month after introducing the chip, Intel recalled it. The Pentium 1.13 GHz would eventually come back in 2001, but at the pace of CPU innovation at the time, even a six-month delay was detrimental.In June 2000, AMD introduced a refinement of Athlon, codenamed Thunderbird, and days before Intel’s recall, introduced the Athlon 1100. AMD remained uncontested throughout the rest of the year, pushing Thunderbird up to 1.2 GHz. Intel was closing the curtain on Pentium III and trying to move attention away from Athlon toward its upcoming Pentium 4 range.Going for gigahertz (2001 - 2004)Going for gigahertz (2001 - 2004)Intel was struggling to keep pace with Athlon, but work was going on behind the scenes on the new NetBurst microarchitecture, which was set to become the successor to P6. It was introduced to the world with the Willamette core inside the first Pentium 4. Like most major microarchitecture shifts we’ve seen from Intel and AMD, NetBurst wasn’t an immediate success. However, Pabst noted in our review: “I am certain that Intel will deliver very fast Pentium 4 processors