GoKawiilToday marks 20 years since the first raft of Intel Core 2 Duo processors, codename Conroe, was launched. Ten Intel Core 2 Duo and Intel Core 2 Extreme processors were unveiled for consumer and business desktop and laptop PCs and workstations on July 27, 2006. We were lucky enough to test Intel’s now legendary new desktop processors earlier in the month, and our reviewer anointed the Core 2 Duo “the new king.” Our early hands-on review underlined that “as soon as Core 2 Duo hits the market, it will outperform the complete Athlon 64 family (X2 and FX) in all areas, including gaming, where AMD has traditionally been very strong.”
Swipe to scroll horizontally The four mainstream and one high-end desktop Core 2 Duo processors that launched on July 27, 2006 Core 2 Model Clock Speed Multiplier Front Side Bus Speed L2 Cache Extreme X6800 2,933 MHz x11 266 MHz (FSB1066 QDR) 4 MB Duo E6700 2,666 MHz X10 266 MHz (FSB1066 QDR) 4 MB Duo E6600 2,400 MHz X9 266 MHz (FSB1066 QDR) 4 MB Duo E6400 2,133 MHz X8 266 MHz (FSB1066 QDR) 2 MB Duo E6300 1,866 MHz X7 266 MHz (FSB1066 QDR) 2 MB
The GHz race ends with an architectural revolution
One of the defining characteristics of the first Intel Core 2 Duo chips was that they kicked the GHz race to the periphery of the battlefield. After years of chips being sold with this performance statistic placed most prominently, Intel and the tech media had to educate the wider public that higher GHz numbers didn’t define performance.
Intel Conroe desktop chips came with a generational performance uplift we don’t see often. These third-generation dual-core processors from Team Blue would “provide up to a 40 percent increase in performance and are more than 40 percent more energy efficient versus Intel's previous best processor,” according to launch-day PR. Testers also observed that even the entry-level new Conroe chips could outpace the mighty flagship desktop Pentium Extreme Editions, despite running at nearly half the clock speed.
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Behind the real-world performance successes Intel eagerly highlighted, and reviewers seemed genuinely excited by, there were a number of architectural innovations and refinements. Intel boasted that the Core 2 Duo contained “a whopping 291 million transistors” and had achieved many benchmark firsts in internal tests. Conroe arrived with higher efficiency, shorter pipelines, improved branch predictions, new shared Smart Cache, and substantially higher IPC, all built upon Intel’s newest 65nm process technology. With this attractive new price, it wasn’t difficult for Intel to retire its former king, with its hot, power-hungry, and big GHz Netburst architecture.
(Image credit: Tom's Hardware)
Defining the next decade+
With the Core 2 Duo, Intel regained its performance leadership from AMD and its Athlon parts. Conroe, the desktop Core 2 architecture, didn’t get singled out in our five best Intel CPUs of all time article (2024), but it was the direct ancestor of the legendary Core 2 Quad CPUs. These quad-core CPUs would take the Gillette-like next logical step with four cores on a chip, combining two Conroe dies in a single package, and launching in January 2007.
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