AMD Ryzen 9 9950X3D2: 3D V-Cache on Both Halves of the Chip
The short answer: the Ryzen 9 9950X3D2 is sixteen Zen 5 cores carrying AMD's stacked 3D V-Cache on both eight-core clusters instead of one, which gives 192MB of L3 and 208MB of cache in total. What it removes is a question rather than a bottleneck: on every other twelve and sixteen core X3D processor there is a right half and a wrong half for a game to land on, and here there is not. Very few people need that. It is a £324.00 option on the G6 Apex 5 and the G6 Apex 6, the only two machines that offer it, and for almost everyone reading this the Apex 5 as it ships at £3209.99 is the better buy.
Kevin will talk most people out of this processor. Call him on 01902 714533, say what the machine has to do when it is not gaming, and he will name which of the five processors on the Apex 5 belongs in it.
What Dual 3D V-Cache Means, Precisely
One diagram explains the whole processor. Everything else on this page follows from it.
Every Ryzen 9 is more than one piece of silicon. Sixteen cores arrive as two separate eight-core dies, called clusters or CCDs, sitting on a single package alongside an input and output die that carries the memory controller and the PCIe lanes. Each cluster has its own pool of L3 cache, and on a Zen 5 chip each pool is 32MB.
3D V-Cache is a second slice of silicon, 64MB of cache and nothing else, bonded to a cluster. On Zen 5 it sits beneath the cores rather than on top of them, so the heat from the cores has a clear path to the cooler. That is why the Ryzen 7 9800X3D and everything after it clocks like an ordinary Ryzen chip and lost the overclocking restrictions the Ryzen 7000 X3D parts carried. Add that 64MB to a cluster's own 32MB and the cluster holds 96MB of L3.
The Ryzen 9 9950X3D gets one slice. One cluster runs on 96MB, the other on 32MB, the L3 total is 128MB, and with 16MB of L2 the chip carries 144MB. The 9950X3D2 gets two slices. Both clusters run on 96MB, L3 comes to 192MB, and the total with L2 is 208MB. Those are AMD's published figures and they are the entire specification difference between the two processors.
The number is not the point. Sixteen cores does not make a game faster, and neither does cache that a game never reads. What changes is that the processor no longer has a good half and a bad half.
Why AMD Cached Only One Half Until Now, and What That Cost
Stacking cache is not free. The extra slice costs money to make, it adds height to the package, and until Zen 5 it sat on top of the cores where it trapped their heat. That is the reason the Ryzen 7 7800X3D ran slower than the ordinary 7700X and arrived with its overclocking locked down. Putting one slice on a sixteen-core processor was the compromise the engineering allowed: gaming speed from one cluster, full clock speed from the other, and one cache die's worth of cost and heat rather than two.
That compromise handed a job to the software. A game gets the frame rate the X3D name promises only if Windows runs it on the cluster that carries the cache. AMD ships a chipset driver and a provisioning service to make that happen, and the arrangement leans on the Xbox Game Bar to work out which running application is a game, so the scheduler can park the other cluster's cores and keep the game where it belongs.
Most of the time this works and nobody thinks about it. The times it does not are recognisable. A title launched through a wrapper or a third-party launcher. Something the Game Bar does not classify as a game at all. A heavily modded build, or a game running alongside capture software, a browser full of tabs and a second screen doing something else. When the scheduler gets it wrong the game runs on the cluster without the stacked cache, and the frame rate is a Ryzen 9 9950X frame rate. Nothing is broken. You paid for a result and on that occasion you did not get it.
The 9950X3D2 removes the decision. Both clusters carry the cache, so there is no cluster it is wrong to land on, and the reviewers who have tested the chip report that the Game Bar arrangement becomes close to optional in practice, even though AMD still recommends leaving it in place. That is the product. Not a faster processor so much as one that gives the same answer whatever the scheduler does. Whether that is worth £324.00 depends entirely on whether the uncertainty has ever cost you anything.
It is not free on the specification either, and this is the part the headlines skip. AMD publishes the 9950X3D2 at a 5.6GHz maximum boost against 5.7GHz on the 9950X3D, and at a 200W default TDP against 170W, with the same 4.3GHz base clock on both. Two cache slices instead of one is more silicon to feed and 100MHz less at the very top of the range. On a lightly threaded job that lives on peak clock speed, the older and cheaper chip is fractionally ahead. Anyone calling this a straight upgrade has not read the specification sheet.
Practically, 200W held flat through a long render is heat that has to go somewhere, and AMD's own guidance for this processor is that a liquid cooler is recommended. The two machines that take it, the G6 Apex 5 and the G6 Apex 6, both run a 360mm liquid cooler as standard on a Gigabyte X870 board with Wi-Fi 7 and Bluetooth onboard. Where that radiator goes is a decision rather than a default, because a badly placed one sits in the graphics card's intake and then both parts run hotter for it. Memory is fitted as a matched pair so the processor has both channels to work with, since one stick leaves half the available bandwidth unused, and the profile is switched on and proved before the machine leaves the bench. It then spends a full day running under load in our Wolverhampton workshop, which is where a marginal part announces itself instead of waiting to do it at your desk in week three.
At this money, what happens after the sale counts for as much as the cache diagram does. Ginger6 has been assembling machines by hand in Wolverhampton since 2001, the phone on 01902 714533 is answered by Kevin rather than by a support desk, and anything that needs attention inside the 3-year warranty goes through him instead of a ticket system. On a machine at this price that is worth more than the last 100MHz, and he will say so before he sells you the upgrade.
Almost Nobody Needs This. Here Are Four Reasons Why.
Four cheaper answers with their real prices, before we get anywhere near the two machines that offer it. This costs us margin and it is what Kevin says on the phone.
If it only plays games, buy the 9800X3D
A game runs on one eight-core cluster with 96MB of L3 cache behind it. That is what a game sees on the 9950X3D2, and it is also what it sees on the eight-core Ryzen 7 9800X3D. Reviewers describe the gaming gain from the second cache slice as modest rather than a step change, and AMD said much the same at announcement. In a G6 Fusion 800 X2 the 9800X3D comes to £1495.99. That is well under half of £3533.99, and the difference buys a far larger graphics card, which is the part that sets frame rates once you are past 1080p.
If you want sixteen cores, buy the 9950X3D
It is £324.00 less and it is the right processor for almost everyone who reaches this page. The G6 Apex 5 ships with it as standard at £3209.99 behind an RTX 5080. Same sixteen cores, same 4.3GHz base clock, a slightly higher 5.7GHz peak boost, and one cluster with the stacked cache instead of two. Unless the scheduling question is a problem you have personally had, on your machine, in a game you care about, this is the one to buy.
It is not quicker at everything
AMD publishes a 5.6GHz maximum boost on the 9950X3D2 against 5.7GHz on the 9950X3D, and a 200W default TDP against 170W, with the same 4.3GHz base clock on both. On single-threaded work that hangs on peak clock speed the older processor is marginally ahead, so this is not a straight upgrade across the board. It is a trade, and what you are trading away is 100MHz at the top and 30W of extra heat for a result that does not depend on how Windows schedules the work.
If you already own a 9950X3D, keep it
Swapping a working sixteen-core X3D processor for this one is a large sum for a change most people will never measure. If one particular title has behaved oddly on your machine, the cheaper first move is to confirm the AMD chipset driver and the Xbox Game Bar are both in place, since between them they are what steers a game onto the cache cluster. Call Kevin on 01902 714533 and describe the symptom before you spend anything at all.
The Two Machines That Offer the 9950X3D2
It is an upgrade option in the processor dropdown rather than a fixed specification, and it appears on two builds only. Both are in stock. The two rows underneath them are the cheaper answers, which is where most readers should end up.
The 9950X3D2 is not offered on any Fusion build and it is not on the AMD custom PC builder, where every other AMD processor is. If you want the Apex 5 hardware with a gaming-only chip, the Ryzen 7 9800X3D is a £192.00 reduction on it and takes the machine to £3017.99. Browse the rest of the range on the Ryzen 9 gaming PC page. Prices were read live from the configurators at the time of writing, and the current figure is always in the dropdown on the product page.
The Three People This Processor Is Built For
Having spent most of the page arguing against it, here is the case for it, drawn as narrowly as it deserves.
You Game and Render on the Same Day
Take it if the machine renders, exports or compiles through the working day and plays at 1440p or 4K in the evening, and you want the same answer from it every time without thinking about which half of the processor is being used. Sixteen cores finish those jobs in roughly half the time eight do, and here every one of the sixteen has stacked cache behind it.
Your Games Are the Cache-Hungry Ones
Take it if you fly, race, or run large city builders, factory games and grand strategy. Those titles ask the processor for scattered small pieces of data more often than almost anything else, which is exactly the work cache absorbs, and they keep several threads busy at once. With both clusters cached, a secondary simulation thread cannot land somewhere slower than the main one.
The Scheduler Has Let You Down Before
Take it if you have watched a twelve or sixteen core X3D machine give inconsistent results in one particular title, and you would rather pay to remove the variable than keep chasing it. That is the honest case for the £324.00. If it has never happened to you, it is not a problem worth £324.00 to solve, and the Ryzen 9 9900X3D or the 9950X3D will do the same work for less.
Still not sure? Call Kevin on 01902 714533 or email [email protected] with four things and he will name the processor to fit, including the times it is the cheapest one on the list:
1. The games you play most often. 2. Your monitor resolution and refresh rate. 3. What the machine does when it is not gaming, and how long those jobs run for. 4. Your approximate budget.
Prefer to specify it yourself? The 9950X3D2 is not on the AMD custom PC builder, but every other AMD processor is. 0% finance available via PayPal Pay in 3 on orders over £500. Subject to status.
Common Questions About the Ryzen 9 9950X3D2
The AMD Ryzen 9 9950X3D2 Dual Edition is a sixteen-core, thirty-two-thread Zen 5 desktop processor for the AM5 socket. AMD publishes it at 4.3GHz base and 5.6GHz maximum boost, with 192MB of L3 cache and 16MB of L2, so 208MB in total, and a 200W default TDP. What separates it from every X3D chip before it is that the stacked 3D V-Cache sits on both eight-core clusters rather than one, so there is no cluster without cache for a game to land on. It uses DDR5 memory and carries AMD Radeon integrated graphics.
Cache placement, and two small trades. Both are sixteen-core, thirty-two-thread Zen 5 processors on AM5 with a 4.3GHz base clock. The 9950X3D carries stacked cache on one of its two eight-core clusters, giving 128MB of L3 and 144MB in total. The 9950X3D2 carries it on both, giving 192MB of L3 and 208MB in total, which removes the need for Windows to steer a game onto the correct cluster. In exchange, AMD publishes a 5.6GHz maximum boost against the 9950X3D's 5.7GHz, and a 200W default TDP against 170W. In a G6 Apex 5 the 9950X3D is the standard fit at £3209.99 and the 9950X3D2 is a £324.00 option, which takes the machine to £3533.99.
For gaming on its own, no. A game runs on one eight-core cluster with 96MB of L3 cache, and it gets that from the far cheaper Ryzen 7 9800X3D as well, which comes to £1495.99 in a G6 Fusion 800 X2. Reviewers describe the gaming gain from the second cache slice as modest rather than a step change. The 9950X3D2 earns its price when the machine also renders, exports, encodes or compiles, and when you want the same result from it every time regardless of how Windows schedules the work. If the only demanding thing the machine ever does is play games, put the difference into the graphics card instead.
Because two stacked cache slices take more of the power and thermal budget than one. AMD publishes the 9950X3D2 at a 5.6GHz maximum boost against 5.7GHz on the 9950X3D, alongside a higher 200W default TDP against 170W, with the same 4.3GHz base clock on both. The practical effect is small: on a lightly threaded task that depends on peak clock speed the 9950X3D is fractionally ahead, and on work that leans on cache the 9950X3D2 is ahead. It does mean the newer chip is not a straight upgrade in every workload, which is worth knowing before you spend the difference.
Two, and on both it is an upgrade option rather than the standard fit. The G6 Apex 5 with an RTX 5080 starts at £3209.99 with a Ryzen 9 9950X3D, and the 9950X3D2 is a £324.00 option in the processor dropdown, taking it to £3533.99. The G6 Apex 6 with an RTX 5090 starts at £5889.99 and the same £324.00 option takes it to £6213.99. No other Ginger6 build offers this processor and it does not appear on the AMD custom PC builder. Both machines are in stock and hand-built to order in Wolverhampton.
£3533.99 for a G6 Apex 5 with an RTX 5080, which is the cheapest machine Ginger6 builds with this processor, and £6213.99 for a G6 Apex 6 with an RTX 5090. Both include free UK mainland delivery, a 3-year warranty and 24 hours of stress testing before dispatch. For comparison, the same Apex 5 with the standard Ryzen 9 9950X3D is £3209.99, and with a Ryzen 7 9800X3D it is £3017.99.
AMD's own guidance for this processor is that a liquid cooler is recommended, and at a 200W default TDP that is sensible advice rather than a formality. A render or a long export holds the load flat for an hour at a time, which is a far harder test than any short benchmark, and coolers that look adequate on paper are the ones that quietly hand back clock speed halfway through. The two machines that take this chip, the G6 Apex 5 and the G6 Apex 6, both run a 360mm liquid cooler as standard on a Gigabyte X870 board with Wi-Fi 7 and Bluetooth, tuned on the bench for a load that lasts.
On a Ryzen 9 9950X3D the Game Bar matters, because Windows uses it to work out which application is a game so the scheduler can put it on the cluster carrying the stacked cache. On the 9950X3D2 both clusters carry the cache, so there is no wrong cluster, and reviewers report that the arrangement becomes close to optional in practice. AMD still recommends leaving the Game Bar and the AMD chipset driver in place, and so do we, since both do other useful work. Removing that uncertainty is the main thing the £324.00 buys.
The Chips We Would Sell You Instead
Ryzen 9 9950X3D
The same sixteen cores with one cached cluster instead of two, a slightly higher peak boost, and £324.00 less on the G6 Apex 5.
Read the GuideRyzen 7 9800X3D
Eight cores with 96MB of L3 cache. The answer for a machine that plays games and does nothing else demanding, from £1495.99 fitted.
Read the GuideEvery Ryzen 9000 Chip Explained
The ten processors we build with, what each one is for, and the price of putting any of them into a machine.
Read the GuideIf the sixteen cores are for work rather than games, the Ryzen 9 9950X guide covers the version with no stacked cache at all, which is a good deal cheaper.
Ready to Decide on the 9950X3D2?
Two machines take it, both as a dropdown option rather than a fixed specification. Whichever processor you land on, the machine is assembled by hand in Wolverhampton, stress-tested for 24 hours, and backed by a 3-year warranty. The person who answers your call is the person who builds it.