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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteAn advanced chip package combines multiple semiconductor dies—such as processors, memory and I/O—into one package and connects them so they can work as a system. Instead of putting every function on one piece of silicon, designers can integrate specialized dies that may use different manufacturing processes. The term describes a broad set of approaches, not one standard design.
What makes a chip package “advanced”?
In a conventional single-die design, much of a system’s functionality is built onto one silicon die. Advanced packaging brings multiple dies together and provides the connections between them. The package therefore becomes part of the system architecture: it determines how components communicate and how they are physically integrated.
This approach is often called heterogeneous integration. A package might combine logic, memory and I/O dies, including dies made on different process nodes or by different suppliers. Intel describes the broader shift as moving from “system on a chip” to “systems of chips”; TSMC groups its integration technologies under the 3DFabric family. Neither label denotes a single universal package design. Intel Foundry’s overview and TSMC’s advanced-packaging services page describe their respective approaches.
How 2.5D packaging connects dies side by side
In 2.5D packaging, dies sit beside one another rather than being stacked directly on top of each other. A bridge or interposer provides dense lateral connections between them. Think of the dies as buildings on the same level, with a high-capacity road network between them.
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- 8 cores and 16 threads, delivering +~16% IPC uplift and great power efficiency
- 96MB L3 cache with better thermal performance vs. previous gen and allowing higher clock speeds, up to 5.2GHz
- Drop-in ready for proven Socket AM5 infrastructure
- Cooler not included
Bridge-based packages
Intel’s EMIB embeds a silicon bridge in the package substrate to connect dies. Intel calls it “Embedded Multi-die Interconnect Bridge 2.5D” and says EMIB has been in mass production since 2017. Its EMIB 3.5D approach combines EMIB with Foveros vertical stacking; Intel cites its Data Center GPU Max Series as an example. Intel reports that this product has more than 100 billion transistors across 47 active tiles and five process nodes. These are Intel’s company-reported product details, not a general specification for advanced packages. Intel Foundry’s packaging page provides the descriptions.
Interposer-based packages
TSMC’s CoWoS is a 2.5D approach that integrates system-on-chip dies with high-bandwidth memory (HBM). In CoWoS-S, a silicon interposer carries the connections. TSMC says the interposer can reach up to 3.3 times reticle size; that is a stated limit for this CoWoS-S implementation, not a typical package size or a general industry limit. See TSMC’s CoWoS technology page.
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How 3D packaging stacks dies vertically
Three-dimensional packaging places dies on top of one another and uses dense vertical connections between layers. The arrangement can bring components close together, but it also makes the design dependent on vertical interconnects and requires attention to heat removal and assembly.
Intel describes Foveros Direct as chiplets stacked on an active base die using copper-to-copper hybrid bonding. TSMC’s System on Integrated Chips (SoIC) is another vertical-integration technology. In its 2025 annual report, TSMC said its 3nm SoIC stacking technology entered volume production in 2025. That status refers to the specific technology and date reported by TSMC, not all SoIC versions. Intel’s packaging page and TSMC’s 2025 annual report, Chapter 5 describe these examples.
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Where fan-out packaging fits
Fan-out packaging uses redistribution layers (RDLs) to route electrical connections across the package footprint. It is another advanced-packaging family, not simply a synonym for chiplet integration. TSMC says its InFO technology offers 2.5D and 3D options and uses through-InFO vias. InFO-PoP integrates a mobile application processor with DRAM in a package-on-package arrangement; InFO-oS supports multiple logic chiplets. The structures and intended uses differ, so “fan-out” alone does not specify a package’s full design. Details are on TSMC’s InFO technology page.
How the main approaches differ
| Approach | Physical arrangement | Connection method or example |
|---|---|---|
| 2.5D | Dies placed side by side | A bridge or interposer provides dense lateral connections; examples include Intel EMIB and TSMC CoWoS. |
| 3D | Dies stacked vertically | Dense vertical interconnect; examples include Intel Foveros Direct and TSMC SoIC. |
| Fan-out | Connections redistributed across the package footprint | Redistribution layers; TSMC InFO includes mobile PoP and multi-chiplet options. |
| Hybrid | Combines side-by-side and vertical integration | Intel EMIB 3.5D combines EMIB and Foveros. |
These categories describe structures, and a real package can combine them. Vendor technology names such as EMIB, Foveros, CoWoS, SoIC and InFO refer to specific technology families, not interchangeable generic terms.
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- Cooler not included
What to compare when evaluating a package
“2.5D” or “3D” does not by itself tell you whether a package is faster, cheaper or more efficient. The relevant trade-offs depend on the components and design goals. Useful questions include:
- Interconnect and bandwidth: How much data must move between dies, and what connection density does the design need?
- Footprint: How much package area is available, and does the design need a large interposer or compact stacked arrangement?
- Power and thermal management: How will power be delivered and heat removed, particularly when dies are stacked?
- Assembly complexity and yield: How many dies and connections must be assembled successfully, and what does that mean for manufacturing risk?
- Cost: What are the costs of the chosen interposer, bonding, assembly and testing approach?
- Integration needs: Which logic, memory or I/O components must be brought together, and do they need to use different process nodes?
Intel and TSMC describe architectures and intended applications, but the cited vendor pages do not provide an independent apples-to-apples ranking of their packages for performance, cost, power or yield. Intel’s fact sheet reports more than 100 of its own 2.5D products in volume production; that is an Intel company claim, not an industry-wide product count. Intel Foundry’s fact sheet states the figure.
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