AMD Unveils Ryzen 9 7950X3D, 7900X3D, and Ryzen 7 7800X3D, Up to 128 MB of L3 Cache And 5.7 GHz Boostby Gavin Bonshor on January 4, 2023 10:31 PM EST
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:
- AMD Zen 4 Ryzen 9 7950X and Ryzen 5 7600X Review: Retaking The High-End
- AMD's Desktop CPU Roadmap: 2024 Brings Zen 5-based "Granite Ridge"
- AMD Zen Architecture Roadmap: Zen 5 in 2024 With All-New Microarchitecture
- AMD Zen 4 Update: 8% to 10% IPC Uplight, 25% More Per-Per-Watt, V-Cache Chips Coming
- AMD Demonstrates Stacked 3D V-Cache Technology: 192 MB at 2 TB/sec
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|
|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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AndrewJacksonZA - Friday, January 6, 2023 - link>> "It's not speculation, AMD has officially confirmed that's the reason they did it... They are working with Microsoft..."
Got proof? Got a link please?
Oxford Guy - Friday, January 6, 2023 - linkMicrosoft Windows, the utterly brilliant operating system that restarts when someone is in the middle of their work — to install an "update" that overwrites the software the end-user (the ostensible owner of the machine) prefers to have.
That Windows is still the dominant OS says a lot about humanity and it's not favorable.
Dribble - Thursday, January 5, 2023 - linkSo basically the only one worth getting is the 7800X3D as that's the only one that's fully cached. The others are misleading as only 1/2 the cores have the cache, and the cached CCD (which will be faster nearly all the time) has lower than advertised clocks.
Hul8 - Wednesday, January 4, 2023 - linkThe top image of the CPU would also seem to indicate this. (Unless only one CCD's V-cache die being exposed is for illustrative purposes only.)
It would also make sense for the use case. Gains from V-cache are mostly in gaming, and games usually don't use more than one CCD's worth of cores.
As long as that sort of asymmetric setup works (and Windows scheduler remains on top of things to prioritize the die with the V-cache), omitting an extra configuration with 32MB of V-cache would help to streamline production. It's doubtful such parts would be useful for EPYCs, so why create them especially for gaming?
nandnandnand - Wednesday, January 4, 2023 - linkThat top image is identical to how 5800X3D was portrayed, and it's labeled 7800X3D. The two gray parts are just unusable structural silicon, not cache:
nandnandnand - Wednesday, January 4, 2023 - linkI got heavily confused but you get the point.
shing3232 - Thursday, January 5, 2023 - linkWindows scheduler would prefer work at first CCD when handle any 2CCD/CCX CPU anyway. It would just work as usual on Win10/11.
3D cache is mean to reduce latency and reduce access across infinity fabric. Dual X3D CCD probably not very useful on a client setting as you need at least two single latency sensitive application to run at two CCD.
The Von Matrices - Thursday, January 5, 2023 - linkThe two 7950X CPU's I've used already have two unequal die. Only cores 0-7 can hit the max boost; cores 8-15 are on a weaker die and boost about 200MHz lower even when only one thread is pinned to them. When loading 32 threads, cores 8-15 consistently run 100MHz slower than cores 0-7. The Windows 11 scheduler seems to know this and prioritizes loading cores 0-7 before turning on cores 8-15. In fact, I rarely see Windows assign anything to cores 8-15 unless running some single piece of software that can fully load more than 8 cores.
jospoortvliet - Thursday, January 5, 2023 - linkSadly, that won’t help here as it isn’t a case of a fast and a slow die. One die runs at max 5ghz but has 96mb l3, the other boosts to 5.7 but has only 32mb cache. So some apps run better on ccd with cache others with raw speed. And your OS has no clue so half your threads likely end up running on the wrong ccd. I am very curious to learn how AMD expects to optimize this.
The Von Matrices - Friday, January 6, 2023 - linkI agree. This would be the first CPU I know where the core assignment is based upon the type of software being not just how many CPU cycles are needed. All the other hybrid core designs on desktops and even in the ARM world have a hierarchy of slow and fast cores where the fast cores complete any type of workload quicker than the slow cores.