During Computex 22, AMD showcased its updated CPU roadmap going through 2024, which yielded some exciting propositions to the desktop processor market. One of those products highlighted was a new 3D V-Cache SKU based on Zen 4 cores, and with the success of its previous Ryzen 7 5800X3D with 96 MB of 3D stacked V-Cache, gamers have been chomping at the bit for more ever since. Using their primetime keynote slot during CES 2023, AMD has unveiled its next 3D V Cache-based processors to the market using its Zen 4 core architecture.

AMD hasn't unveiled just one new Zen 4-based X3D SKU; it's announcing three across the Ryzen 7000 series, the Ryzen 9 7950X3D, the Ryzen 9 7900X3D, and the Ryzen 7 7800X3D. Aside from 64 MB of additional L3 cache through AMD's 3D V-Cache stacking technology, which is a 3D chiplet stacking technology in conjunction with TSMC, all three Zen 4 X3D SKUs feature a 120 W TDP. They also have higher boost core frequencies than previous X3D chips, with the Ryzen 9 7950X3D boosting up to an impressive of 5.7 GHz on the core.

AMD and 3D Chiplets: Stacking L3 Cache For Gamers

Since AMD released its first desktop processor featuring its 3D V-Cache packaging technology, the Ryzen 7 5800X3D, it has given users and gamers a taste of the benefits that large pools of L3 cache can have on framerates in CPU-limited scenarios. Focusing on the previous Ryzen 7 5800X3D, AMD and TSMC added 64 MB SRAM chiplet onto the top of the existing 32 MB through a direct copper-to-copper bonding TSV to ensure circuit integrity.

The method includes die thinning, intending to enable parity between the 3D stacked chiplet, the rest of the silicon, and the integrated heat spreader (IHS) so that it fits within the same overall platform frame, e.g., cooler and compatibility. As the Ryzen 7 5800X3D and its 96 MB of stacked L3 V-Cache displayed significant improvements in specific titles, the extra L3 cache didn't provide that performance gain in other titles; there still isn't an official list of games that benefit from extra L3 cache.

The main caveat with the Ryzen 7 5800X3D came through its compute performance. With slower overall core clock speeds than the Ryzen 7 5800X, it suffered in tasks such as rendering, encoding, and any task or workload that didn't benefit from large amounts of L3 cache. It looks as though AMD considered that and did it better.

Below is a list of our detailed coverage of AMD's Ryzen 7000 desktop processors and its 3D V-Cache packing technology:

Ryzen 9 7950X3D: New Flagship For Gaming with 128 MB L3 Cache, Up to 5.7 GHz

AMD has gone all out with its 3D V-Cache packaging technology with the announcement of AMD Ryzen 9 7950X3D, a 16-core, 32-threaded behemoth with 128 MB of L3 cache, and a boost core clock speed of up to 5.7 GHz. While we saw some concessionary trade-offs between the previous generation Ryzen 7 5800X3D in computation performance, this was explained by lower voltages, necessitating a lower core base frequency and a lower core boost frequency. Consequently, pure CPU compute performance declined in contrast to the Ryzen 7 5800X.  

The latest Ryzen 7000 X3D SKUs look to alleviate much of the previous discrepancies in performance like we saw with the Ryzen 7 5800X3D and 5800X, by allowing for similar peak turbo clock speeds without interfering with the integrity of the stacked silicon in the 3D V-Cache stack.

We have reached out to AMD to confirm how they managed to secure the integrity with a much greater boost clock speed than the previous Ryzen 7 5800X3D. Still, with the efficiency of TSMC's 5 nm node and performance-per-watt upgrade with AMD's Zen 4 core architecture over the 7 nm Zen 3 core, we believe this combination is one of the reasons how they managed it. We have also reached out to AMD on whether or not the Ryzen 7000 X3D processors are unlocked or if overclocking via the frequency multiplier is disabled. Once we receive a reply, we will update this piece with their response.

Opening with the flagship SKU, the Ryzen 9 7950X3D shares many of the same characteristics as the Ryzen 9 7900X, including 16-cores and 32-threads and a turbo frequency of up to 5.7 GHz. The enhanced chip offers 128MB of L3 cache, which is comprised of 64 MB of existing pooled L3 cache in the CCDs, and another 64 MB sliced on top with TSVs (presumably placing 64MB on one CCD, creating an unbalanced cache). Curiously, the official TDP is also much lower, with the chip rated at 120 W versus 170 W for the regular 7950X. Consequently, the 7950X3D has a lower base core frequency of 4.2 GHz, versus 4.5 GHz. Although the Ryzen 9 7950X3D has a 300 MHz slower base frequency, having the same turbo frequency of 5.7 GHz means that peak performance can be similar, though in heavily multithreaded situations the lower TDP is undoubtedly going to come into play.

AMD Ryzen 7000X/X3D Series Line-Up
AnandTech Cores
Ryzen 9 7950X 16C / 32T 4.5 GHz 5.7 GHz DDR5-5200 64 MB 170 W $699
Ryzen 9 7950X3D 16C / 32T 4.2 GHz 5.7 GHz DDR5-5200 128 MB 120 W TBD
Ryzen 9 7900X 12C / 24T 4.7 GHz 5.6 GHz DDR5-5200 64 MB 170 W $549
Ryzen 9 7900X3D 12C / 24T 4.4 GHz 5.6 GHz DDR5-5200 128 MB 120 W TBD
Ryzen 7 7800X3D 8C / 16T TBD 5.0 GHz DDR5-5200 96 MB 120 W TBD
Ryzen 7 5800X3D 8C / 16T 3.4 GHz 4.5 GHz DDR4-3200 96 MB 105 W $449

AMD is competing at the top end of the x86 desktop market with its 16-core offerings, both in compute and gaming. Still, AMD has also readied a 12-core solution with their X3D chiplet packaging technology, the Ryzen 9 7900X3D. Sitting alongside the Ryzen 9 7900X in the stack, the Ryzen 9 7900X3D has double the L3 cache (128 vs. 64 MB) and the same 4.4 GHz boost core clock speed. The only differences come in the way of base frequencies and power consumption, with the Ryzen 9 7900X3D having the same 120 W TDP as all of the new Ryzen 7000 X3D-based SKUs, which as a consequence, does drop the base core frequencies down from 4.7 GHz to 4.4 GHz; a 300 MHz drop on base.

Ryzen 7 7800X3D: Like the Ryzen 7 5800X3D, But Better

The final and third X3D SKU is the Ryzen 7 7800X3D processor, the direct successor, and replacement to the previous Ryzen 7 5800X3D. Sharing the same large 96 MB of L3 cache, AMD has improved the specifications with a faster boost core clock speed of up to 5 GHz, along with the residual benefits that AMD's Zen 4 TSMC 5 nm core brings to the table in both performance, IPC uplift, and performance-per-watt efficiency.

AMD has also provided their in-house figures on the Ryzen 9 7800X3D versus the Ryzen 7 5800X3D, including a claimed 21% uplift in performance at high 1080p settings, 22% in Warhammer Dawn of War 3, and 23% in CS: GO framerates. Further to these performance claims, AMD claims that the Ryzen 9 7800X3D has an uplift of 30% in DOTA 2. AMD hasn't provided any in-house data surrounding compute performance or gaming performance data for the Ryzen 9 7950X3D or Ryzen 9 7900X3D processors.

All three of AMD's latest X3D-based 3D V-Cache packaged processors, including the Ryzen 9 7950X3D, the Ryzen 9 7900X3D, and the Ryzen 7 7800X3D, will be available in February 2023. Although it hasn't provided information surrounding the expected MSRP of each CPU, the Ryzen 7 5800X3D came with a $100 premium over the regular Ryzen 7 5800X. We expect that there will be at least a similar price premium.

With price drops already in force for the non-X3D SKUs already on the market, such as the Ryzen 9 7900X, there could be room for the Ryzen 7000 X3D SKUs to slot in at the original MSRPs of each corresponding processor in the family.

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  • Ryan Smith - Wednesday, January 4, 2023 - link

    You are correct. Thanks!
  • meacupla - Wednesday, January 4, 2023 - link

    From a gaming perspective, I think it makes sense to have one chiplet with the 3D V-cache, as the games that demand this tend to only use 1 core. Other programs may prefer the higher clock speeds
  • nandnandnand - Wednesday, January 4, 2023 - link

    That seems to be the idea. Now we have to see how well Windows and Linux handle it.
  • haukionkannel - Thursday, January 5, 2023 - link

    Another reason is the price. One 3d cache increase the price about $150 to $200… Putting two would increase price by $300 to $400 and not be usefull in gaming!
    The MSRP of 7900x is $550… So one 3d cache chip version will cost $700 to $750 while two 3c cache chipelts would make it $850 $900.. The previous could sell, the later, not so much,,,
  • futurepastnow - Thursday, January 5, 2023 - link

    Probably the VCache can't boost above 5GHz which is why the 7800X3D is limited to that. It's asymmetric.
  • Kevin G - Thursday, January 5, 2023 - link

    This is a very nuanced thing to schedule for as the workloads are not obvious what core would be the better performer. Some will like the raw higher turbo clocks while others will enjoy the larger cache. On the flip side, I don't think we'll have any growing pains like when Alder Lake arrived as the raw core capabilities are the same with the extra L3 cache being the big difference.

    What would be nice is a 16 core model with 192 MB of L3 though. Even at reduced clocks vs. the non-V-cache models, it'd be nice have a symmetrical option. 7970X3D perhaps?
  • Khanan - Thursday, January 5, 2023 - link

    Highly interesting. I suspect the better clocks vs 5800x3D come via 5nm improvements of the Cache, vs 7nm of the predecessors X3D cache. This is almost perfection, it will shred the competition, man I wish I could buy it right now. The 12 and 16 cores are dreams for content creators.
  • Silver5urfer - Thursday, January 5, 2023 - link

    Finally AMD revealed the Zen 4 X3D lineup.

    I think AMD put only half of effort here. First Zen 4 did not need such a quick refresh, it's barely old why would you need this, esp when Zen 4 literally screams through all the workloads across the entire x86 lineup esp the RPCS3 AVX512. Intel Raptor Lake i7 and i9 are faster in Clocks but also higher power harder to cool. And more over if you get an i9 13900K and then unlock it then only it will beat 7950X3D but also upshots the Power. Mid Range 7600X performs perfect for what it is but cannot compete on MT, due to Cinebench accelerator E cores in i5 13600K. Still the chip is potent.

    So AMD should have launched the 7800X3D and waited for Raptor Lake Refresh and put out a full X3D dual CCD Cache chiplets instead of just one on the R9 SKUs 7900X3D, 7950X3D that would ensure Zen 4 X3D refresh being 100% proper. Bet they are saving the top end bins for Genoa-X and not giving much into the Mainstream platform. It's just a single stack that is missing for 2 R9 X3D SKUs damn AMD it's like you almost did but took a step back.

    Also looking at the 300MHz Base clock cut on the R9 parts 12C and 16C along with TDP cut from 170W to 120W that is again conservative, why AMD is always this conservative. The Chips are fast they damn clock at 5.7-5.8GHz why do they need to be like this. Esp when the fact the upper boost range is maintained. I suspect these might not have tuning as well the TDP is limited, so it's just a small advantage that AMD is doing by giving those 16C32T users X3D for gaming advantage, but not a full bore unlocked power. They could have done 200W TDP and gave the dual stack without clock regression if they tried.

    Same for their Radeon RDNA3, they put the slide deck with 3GHz capable design and hamfisted with just 2x 8Pin and also blocked OC tables.

    All in all It's just an OK refresh. 5800X3D also competes extremely good it was able to fight with Alder Lake, Raptor Lake, Zen 4 all of them in Cache intense Gaming workloads. Zen 4 X3D looks like a mid jump of that. RPL Refresh will be setting the parity a little I think as Intel will boost the clocks by 200-300MHz base clock while AMD reduced, that's my guess. Also that gives Intel to fight Zen 5 with 14th gen in 2024 and a 2nd CPU upgrade 2025 on that socket while AMD's Zen 5 X3D might be last, that's however into 2025.
  • Silver5urfer - Thursday, January 5, 2023 - link

    Okay I think maybe it's because of AM5 PPT, 230W, AMD does want to balance out them with TDP by adjusting the R9 top end with higher boost clocks on one of the CCD and reduce base clock boost. A trade off basically. So X3D Stack has some limitations definitely esp when we are dealing with damn 5GHz+ Boost and 4.7GHz Base clocks.

    Look at Intel i9 they always run at lower Base Clocks since a long time not just Big Little but before that Comet Lake and so on.

    A small refresh for those who care about games 7800X3D and for those who want both 7950X3D (not sacrificing the MT performance)
  • Threska - Thursday, January 5, 2023 - link

    Considering zen 4 sales maybe they did.


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