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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Intel’s 45 nm process was more than a smaller version of its 65 nm process: it replaced two key transistor-gate materials with a hafnium-based high-k dielectric and a metal electrode. Intel explained the dielectric and published performance claims, but it did not identify the specific metals in the gate electrode. That undisclosed composition—not a hidden, wholly different process—is the clearest answer to what Intel did not tell the public.
What changed inside Intel’s 45 nm transistor?
As transistor gates became smaller, the silicon-dioxide insulating layer beneath the gate had to become extremely thin to maintain electrical control. At those thicknesses, current could leak through the dielectric. Intel’s 45 nm process replaced silicon dioxide with a hafnium-based high-k dielectric. Because a high-k material can be physically thicker while providing the needed electrical capacitance, it offered a way to reduce that gate leakage without giving up transistor control.
Intel also replaced the polysilicon gate electrode with a metal gate. The dielectric and electrode changes worked together: this was not simply a geometric shrink. Intel and IEEE Spectrum described the move from silicon dioxide and polysilicon to high-k and metal-gate materials as the first fundamental CMOS-transistor redesign in roughly four decades. Intel co-founder Gordon Moore called it “the biggest change in transistor technology since the introduction of polysilicon gate MOS transistors in the late 1960s.”
What gains did Intel claim over 65 nm?
Intel’s 2007 release and white paper compared its 45 nm process with 65 nm. The figures below are Intel’s process claims, not independent measurements or guarantees of a particular processor’s real-world performance.
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| Measure | Intel’s 2007 claim for 45 nm versus 65 nm |
|---|---|
| Transistor density | Approximately twice as high |
| Active transistor-switching power | About 30% lower |
| Drive current | More than 20% higher, according to Intel’s release |
| Transistor-switching speed | Greater than 20% improvement, as an alternative performance comparison in Intel’s white paper |
| Gate-oxide leakage | More than 10 times lower |
| Source-drain leakage | More than five times lower |
These measures describe different parts of the transistor story. Gate leakage is current escaping through the gate dielectric; source-drain leakage is current flowing between the transistor’s source and drain when it should be off. Switching power, drive current, speed and density are also distinct measures, so the percentages should not be combined into a single estimate of how much faster or more efficient a finished computer would be.
Which detail did Intel keep proprietary?
Intel said the gate electrode used a combination of metal materials, but explicitly did not disclose which specific metals it used. Its public account identified the material class and described the electrical goals, while leaving the exact gate-metal composition and stack proprietary. The cited disclosures therefore support saying that the recipe was not fully public; they do not establish a specific undisclosed metal combination.
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When did 45 nm reach Intel processors?
Intel identified Penryn as its first processor family built on the 45 nm high-k process. In a March 2007 roadmap, the company said production was planned for the second half of that year and reported more than 15 designs in development. On November 11, 2007, Intel announced 16 45 nm server and high-end PC processors across its Core 2 and Xeon families.
Intel’s 2007 white paper described Penryn-era designs with more than 400 million transistors in dual-core processors and more than 800 million in quad-core processors. It also noted roughly 50 new SSE4 instructions in that product generation. Those are product-generation details, separate from the process-level leakage and power claims above.
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What else changed—and what did not?
The gate materials were the headline innovation, but Intel retained other established process choices and made additional manufacturing and packaging decisions:
- Interconnects: Intel said its 45 nm chips continued to use copper wiring with a low-k dielectric between wires.
- Lithography: Intel extended 193 nm dry lithography, using new design rules and mask techniques to support cost and manufacturability goals.
- Packaging: Intel announced lead-free 45 nm processors, including copper-column bumps and a tin/silver/copper solder alloy.
What the historical claims do—and do not—tell you
The figures describe Intel’s 2007 process comparison with 65 nm, not a modern benchmark of Penryn CPUs or a prediction of how a specific old PC will perform. They also do not establish current processor prices, availability, reliability or compatibility. The useful takeaway is narrower: Intel’s 45 nm advance paired a high-k dielectric with a metal gate to address scaling-related leakage, while keeping the exact gate-metal recipe to itself.
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- Game Without Compromise. Play harder and work smarter with Intel Core 14th Gen processors
- 20 cores (8 P-cores plus 12 E-cores) and 28 threads. Discrete graphics required
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- Compatible with Intel 600-series (with potential BIOS update) or 700-series chipset-based motherboards
- DDR4 and DDR5 platform support cuts your load times and gives you the space to run the most demanding games
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