This is what makes AMD’s X3D processors so good

When AMD launched the AMD Ryzen 7 5800X3D in 2022, it immediately changed the conversation around gaming CPUs. Without dramatically increasing clock speeds or adding more cores, AMD delivered one of the fastest gaming processors on the market.

The secret? A massive increase in ultra-fast cache thanks to a technology called 3D V-Cache.

Four years on, AMD’s X3D chips are still hitting the same highs and keeping Intel very much on its toes with CPUs like the Ryzen 7 9850X3D, revealed at CES 2026. But what makes AMD’s X3D CPUs so powerful, and what does X3D even mean?

What “X3D” actually means

How does it differ from a regular CPU?

Credit: XDA-Developers

The “X3D” name refers to AMD’s 3D V-Cache technology, which increases the amount of L3 cache on the processor by stacking additional cache vertically on top of the CPU.

Normally, all components of a processor sit on a single flat silicon die. AMD tore up the book a bit on this one and decided to place additional cache memory above the processor cores using an extremely precise silicon bonding technique, creating a much larger L3 memory cache.

However, this design was important in another way: AMD didn’t need to revise the entire design for its CPU. The core part of the CPU, like the cores, execution units, controllers, and so on, all remained the same.

For example, the AMD Ryzen 7 5800X and the AMD Ryzen 7 5800X3D both use the same Zen 3 CPU architecture and the same underlying compute die. That means the two CPUs share the same cores, instruction pipelines, memory controllers, and so on. The only real difference is the additional L3 cache layer attached to the chiplet.

Also note that while AMD stacked the cache on top of the CPU for earlier X3D designs, the latest CPU generations (7000- and 9000- Series) have moved the cache under the CPU for performance reasons. I’ll explain about this in more detail in a moment.

It’s also worth noting that most modern CPUs are specifically designed to manage cache memory dynamically. The CPU just has to manage the additional cache memory, which AMD took care of by increasing the size of the memory pool the CPU expects.

X3D chips literally stack the cache memory

These lads are absolutely stacked

Credit: tester128/Shutterstock

Instead of increasing the size of the CPU die horizontally, AMD adds a separate slice of cache memory on top of the existing compute chip. This additional layer is connected using microscopic vertical connections known as through-silicon vias (TSVs) and a process called hybrid bonding, which connects the cache die directly to the compute die with microscopic vertical connections.

In layman’s terms, it’s easier just to call it chip stacking, resulting in a two-layer processor where the bottom layer contains the CPU cores and standard cache, and the top layer adds the additional L3 cache.

The result is a massive expansion between the “standard” CPU and the X3D version, as you can see in the table below.

As you can see, it’s a big jump in numbers, but that also translates to a large step up in performance — but not in every area. Also note that the Ryzen 7 9850X3D didn’t have a standard CPU that it upgraded from; instead, it was a refresh of the existing Ryzen 7 9800X3D.

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Why X3D processors are so good at certain tasks

And why their clock speeds aren’t always what you expect

X3D chips are great all-around performers, but they excel at a few specific tasks, like gaming. That’s because tasks like gaming, development, programming, and similar tasks all require consistent access to the same types of data: physics calculations, AI behavior, world geometry, and other simulation elements.

Because the X3D chips have an enormous amount of cache memory, the CPUs can hold more situational information rather than constantly having to move data between it and RAM, improving overall performance significantly.

In gaming, this leads to three specific benefits:

1. Games achieve higher average frame rates because the CPU can feed data to the GPU faster. In CPU-limited scenarios—such as high refresh-rate gaming—the difference can be substantial.
2. The larger cache improves frame-time consistency. Instead of occasionally stalling while waiting for memory access, the processor can keep working smoothly, which helps reduce micro-stutters.
3. Certain genres benefit particularly strongly. Large simulation games, strategy titles, and open-world environments often see significant gains because they rely heavily on CPU calculations.

It’s why when AMD launched the Ryzen 7 9850X3D in January 2026, it immediately shot to the top of the gaming CPU charts, and why when you read or watch anything regarding the “best gaming CPU,” the list is always stacked with AMD X3D chips.

Interestingly, X3D processors often run at slightly lower clock speeds than their standard counterparts. This is partly because stacking additional silicon on top of the CPU affects heat dissipation. AMD had to balance thermals, voltage limits, and reliability when designing these processors.

But if you’re thinking that leads to a performance downgrade, think again. The extra cache more than makes up for the slightly reduced clock speeds, and the X3D models typically always outperform the standard versions.

We’re already using “second-generation” 3D V-Cache

AMD’s latest CPUs use even more advanced X3D tech

AMD’s Ryzen 7000 and 9000 AM5 Series CPUs differ slightly from the previous AM4 generation, benefiting from changes in how the stacked cache is integrated.

Earlier X3D processors placed the cache layer on top of the CPU cores, which made cooling more difficult. That’s partially what led AMD to opt for the reduced clock speeds, as thermal dissipation is vital for overall performance.

The newer X3D generation chips swap the stacking process around, moving the larger memory cache below the CPU cores instead of above them. The change means that instead of the cache being closer to the CPU cooler, now, the CPU cores are instead, boosting cooling and, in turn, enabling higher clock speeds.

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AMD’s X3D chips will be the best of the best for a while

Intel doesn’t really have tech for consumer chips

The Ryzen 9000 X3D lineup highlights how AMD sees stacked cache as a long-term CPU strategy. Instead of pushing clock speeds ever higher, the company is improving efficiency by reducing memory bottlenecks and increasing the amount of data the processor can store locally.

Another reason X3D is so popular is that its only real competitor, Intel, doesn’t have a similar hardware system at the current time. Or, at least, it uses a different approach, focusing on hybrid CPU designs that combine its high-performance P-cores with efficient E-cores to boost multi-threaded performance.

On top of that, Intel has largely prioritized higher clock speeds to improve performance rather than enormous cache sizes. It’s been a mixed bag, but it has led to some of Intel’s latest chips being incredibly power-efficient while delivering exceptional processing power.

In that, Intel is still using a type of stacked CPU design, it’s just a different implementation with a different focus.

But all in all, it means that for now, AMD’s X3D chips continue to hit the highest heights, and it’ll take some serious effort to take them down.

Brand

AMD

CPU Model

Ryzen 9 9950

CPU Socket

AM5

Cores

16

Threads

32

Process

TSMC 4nm

The AMD Ryzen 9 9950X3D is a flagship Zen 5 desktop processor built for gaming and heavy workloads. With 16 cores, 32 threads, boost speeds up to 5.7 GHz, and 3D V-Cache expanding total cache to around 144 MB, it delivers exceptional gaming performance while maintaining strong multi-threaded productivity on the AM5 platform.