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Ryzen 7800X3D preview - 7950X3D One CCD Disabled
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According to AMD product pages, the upcoming 7950X3D and 7800X3D are Unlocked for Overclocking.
The AMD Ryzen 9 7950X3D and Ryzen 7 7800X3D Zen 4 processors would be unlocked for overclocking, according to recent a mention on the AMD product pages.
Contrary to what has been shared before, this means that the CPUs will feature an unlocked base-clock multiplier, making overclocking easier than on previous-generation Ryzen 7 5800X3D processors with locked base-clock multipliers. The TDP rating of the 16-core/32-thread 7950X3D and the 8-core/16-thread 7800X3D will be 120 W, which is much lower than the 7950X's 170 W rating. Furthermore, the TJmax value is lower, at 89°C, compared to 95°C for the 7950X and 7700X.
These chips will include stacked 3D vertical cache technology (3DV cache). The 7800X3D will include 64 MB of 3DV cache stacked on top of the 32 MB of on-die L3 cache, bringing the total cache (L2+L3) to 104 MB. The 3DV cache memory on one of the two "Zen 4" CCDs will be available exclusively on the 7950X3D and the 12-core/24-thread 7900X3D. The first CCD will contain 96 MB of L3 cache (including the 3DV cache), while the second will be a normal "Zen 4" CCD with only 32 MB of L3 cache on-die. This means that the L3 cache will be 128 MB for the 7900X3D, and the total cache will be 140 MB for the 7950X3D. AMD has stated that their first CPU with 3D V-Cache, the Ryzen 7 5800X3D, is not overclockable due to the limited voltage that can be safely employed in tandem with the stacked L3 cache.
| AMD Ryzen 7000 Zen4 | Architecture | Cores/Threads | Base /Turbo | L2 + L3 | TDP | iGPU | Price |
|---|---|---|---|---|---|---|---|
| Ryzen 9 7950X3D | Zen 4 | 16/32 | 4.2/5.7 GHz | 16+64+64 MB | 120 W | yes | |
| Ryzen 9 7950X | Zen 4 | 16/32 | 4.5/5.7 GHz | 16+64 MB | 170 W | yes | 849 Euro (699 USD) |
| Ryzen 9 7900X3D | Zen 4 | 12/24 | 4.4/5.6 GHz | 12+64+64 MB | 120 W | yes | |
| Ryzen 9 7900X | Zen 4 | 12/24 | 4.7/5.6 GHz | 12+64 MB | 170 W | yes | 669 Euro (549 USD) |
| Ryzen 7 7800X3D | Zen 4 | 8/16 | 4.x/5.0 GHz | 8+32+64 MB | 120 W | yes | |
| Ryzen 7 5800X3D | Zen 3 | 8/16 | 3.4/4.5 GHz | 4+32+64 MB | 105 W | yes | 489 Euro (449 USD) |
| Ryzen 7 7700X | Zen 4 | 8/16 | 4.5/5.4 GHz | 8+32 MB | 105 W | yes | 479 Euro (399 USD) |
| Ryzen 5 7600X | Zen 4 | 6/12 | 4.7/5.3 GHz | 6+32 MB | 105 W | yes | 359 Euro (299 USD) |
All three processors get a 120W-rated TDP bringing back these processors towards better manageable temperatures. All factors combined can make these processors the most desirable of the year for the gaming end-consumer. The caches are interesting, the Dual-CCD 7900X3D and 7950X3D were demonstrated, with respective total caches of 140 MB and 144 MB. And that means one CCD has a 32 MB L3 cache on-die, and the other is a standard planar CCD.
Currently AMD has altered their product pages to remove this info entirely, implying that the specifications for these chips have not yet been completed.
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Horus-Anhur
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#6098905 Posted on: 02/01/2023 08:06 PM
user1
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#6098935 Posted on: 02/01/2023 09:21 PM
pricing looks pretty good , thought it would be more expensive.
obviously the user can do something about this themselves even if amd doesn't provide an easy switch, as simple as setting core affinity.
I gonna go out on a limb and say that 99.9% of users will not notice , since the performance of zen4 is already really good. real world professional workloads are heavily multithreaded. so what does that leave , maybe the lame mp3 encoder , spreadsheets, word processors? obscure games might suffer, but you'll probably have more than sufficient performance anyway.
Does this user, that mostly uses applications not on the whitelist, and is adversely effected by a performance regression, even exist? I'm guessing there is maybe 5 people world wide that could hypothetically purchase this product and be unsatisfied with it specifically for this reason.
pricing looks pretty good , thought it would be more expensive.
Maybe so. But will end user be able to do this for their own applications that were not checked and tested by this magical person who is going to test every application in existence?
obviously the user can do something about this themselves even if amd doesn't provide an easy switch, as simple as setting core affinity.
I gonna go out on a limb and say that 99.9% of users will not notice , since the performance of zen4 is already really good. real world professional workloads are heavily multithreaded. so what does that leave , maybe the lame mp3 encoder , spreadsheets, word processors? obscure games might suffer, but you'll probably have more than sufficient performance anyway.
Does this user, that mostly uses applications not on the whitelist, and is adversely effected by a performance regression, even exist? I'm guessing there is maybe 5 people world wide that could hypothetically purchase this product and be unsatisfied with it specifically for this reason.
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