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Having just recently built a Ryzen 7 7800X3D CPU based desktop, I was worried I had bought just before a new line came out, but from my reading of the press rel

Having just recently built a Ryzen 7 7800X3D CPU based desktop, I was worried I had bought just before a new line came out, but from my reading of the press release, none of these CPUs are considered a replacement for that chip. I think?

dawnerd 3y ago
Literally did the same last month but heard rumblings about what was coming and felt much better. The 7800x3d is really awesome though.
- slowmovintarget 3y ago
  Same with the Ryzen 9 7900X3D. I got a System76 machine, and it is really good. Nvidia card for GPU / local inference.
  - _cenw 3y ago
    The 7900X3D is by far the worst value AMD currently offers. It only 6 cores per CCX, but two of them, so not only do you get the scheduling issues of the 7950X3D where sometimes games don't use the X3D CCX, you also only get 6 cores if it works. And you get a "7600X3D" (not a real thing) if you disable the other CCX, something 7950X3D owners would sometimes do to benchmark the scheduling difference to get what's essentially a 7800X3D.
    - theogravity 3y ago
      This is the reason why I went with the 7950X and not the 3D variant. Too much additional work involved to get the other cores to play well. Also I read that only one set of 6 cores as full access to cache while the other doesn't or has partial access.
      - _cenw 3y ago
        The cache is on a single CCX, yes. Which is why the 7800X3D is so good: There is no second CCX. Another big advantage is that to get them to work, they need to use higher bin chips. CCX overheats easily because the stacked cache acts like a heat shield, so you get the most power efficient ones.
        kvemkon 3y ago
        The disadvantage of single CCD is only half of available write memory bandwidth (using at least 1 computing thread on each CCD) [1]. [1] 16 B/cycle write vs 32 B/cycle read per CCD https://www.servethehome.com/amd-ryzen-7000-series-platform-overview/amd-ryzen-7000-soc-architecture-soc-topology-with-2x-ccd-1x-iod/ https://www.servethehome.com/amd-ryzen-7000-series-platform-...
        _cenw 3y ago
        I'd wager the number of workloads that'd actually take advantage of operating on entirely different data on a per-thread basis is much, much lower than ones that benefit from massive L3 cache. And note that the infinity fabric and memory controller don't run on the same clock. The fabric tops out at ~2200 (though testing shows sweet spot at 2033 usually) and the memory controller usually tops out at ~3100 (DDR5-6200).
        kvemkon 3y ago
        Those might be not necessary 2 threads of one program, but 2 independent programs.
      - slowmovintarget 3y ago
        The interesting thing was that in testing it turned out that having 3D cache for all cores didn't increase performance. The sweet spot for heat/performance was for half. Granted, I don't think I'm running anything so CPU intensive that I'll be able to tell. For gaming, I was more interested in the DDR5 memory than in worrying about the L3 cache. For everything else I do (including running LLMs and compilers) it's beyond adequate. For a mere $20K I could have had an overall slower gaming experience but be able to locally run things like the Goliath 120B model, but that seemed like a poor trade-off.
- snvzz 3y ago
  Zen5 is meant to be released this year. Just not yet.
_cenw 3y ago
No, the "extreme gaming" line in the press release must have been chosen by someone that have no relation to AMD products and were just told "it does gaming without a GPU pretty good". Which is true, it does do that. These are less important CPUs in this lifecycle though, usually the G series are pretty good for a small computer where you don't want a dedicated tiny GPU, but all but one Ryzen 7000 desktop CPUs had integrated graphics (though, much fewer CUs).
dragontamer 3y ago
AMD is fleshing out the $100 to $250 market with this announcement. Top end $300+ chips (like 7800x3d) are safe. --------- I'm seriously considering the $250 5700x3d for my nieces, or maybe something cheaper. They don't need the latest-and-greatest PC. But having something "pretty good" (and the 5700x3d will be pretty good) is surely going to be appreciated.
- PartiallyTyped 3y ago
  It's a bit funny how the 5800x3d was creeping in the 7xxx series during launch.
  - snvzz 3y ago
    That is my CPU. A great purchase in hindsight. Still great against Zen4, just not against an x3d Zen4.
    - dragontamer 3y ago
      I really want AVX512 on my AMD system (aka: 7xxx series) for maximum irony. So my upgrade will probably be that 7xxx series, probably 7800x3d. This was a feature I thought would appear on mainstream Intel systems first for the longest time. But no, Intel decided to leave it on higher-end Xeons only...
      - snvzz 3y ago
        I can't use my x3d anymore (my family does now), as I moved and left it behind. But I plan on zen5 x3d (at a minimum), or Zen6 if I can hold for that long. Zen+ laptop and some old board with 4790k cover the gap. I'll probably get a RX 7600XT for that haswell.

dawnerd 3y ago

Literally did the same last month but heard rumblings about what was coming and felt much better. The 7800x3d is really awesome though.

slowmovintarget 3y ago
Same with the Ryzen 9 7900X3D. I got a System76 machine, and it is really good. Nvidia card for GPU / local inference.
- _cenw 3y ago
  The 7900X3D is by far the worst value AMD currently offers. It only 6 cores per CCX, but two of them, so not only do you get the scheduling issues of the 7950X3D where sometimes games don't use the X3D CCX, you also only get 6 cores if it works. And you get a "7600X3D" (not a real thing) if you disable the other CCX, something 7950X3D owners would sometimes do to benchmark the scheduling difference to get what's essentially a 7800X3D.
  - theogravity 3y ago
    This is the reason why I went with the 7950X and not the 3D variant. Too much additional work involved to get the other cores to play well. Also I read that only one set of 6 cores as full access to cache while the other doesn't or has partial access.
    - _cenw 3y ago
      The cache is on a single CCX, yes. Which is why the 7800X3D is so good: There is no second CCX. Another big advantage is that to get them to work, they need to use higher bin chips. CCX overheats easily because the stacked cache acts like a heat shield, so you get the most power efficient ones.
      - kvemkon 3y ago
        The disadvantage of single CCD is only half of available write memory bandwidth (using at least 1 computing thread on each CCD) [1]. [1] 16 B/cycle write vs 32 B/cycle read per CCD https://www.servethehome.com/amd-ryzen-7000-series-platform-overview/amd-ryzen-7000-soc-architecture-soc-topology-with-2x-ccd-1x-iod/ https://www.servethehome.com/amd-ryzen-7000-series-platform-...
        _cenw 3y ago
        I'd wager the number of workloads that'd actually take advantage of operating on entirely different data on a per-thread basis is much, much lower than ones that benefit from massive L3 cache. And note that the infinity fabric and memory controller don't run on the same clock. The fabric tops out at ~2200 (though testing shows sweet spot at 2033 usually) and the memory controller usually tops out at ~3100 (DDR5-6200).
        kvemkon 3y ago
        Those might be not necessary 2 threads of one program, but 2 independent programs.
    - slowmovintarget 3y ago
      The interesting thing was that in testing it turned out that having 3D cache for all cores didn't increase performance. The sweet spot for heat/performance was for half. Granted, I don't think I'm running anything so CPU intensive that I'll be able to tell. For gaming, I was more interested in the DDR5 memory than in worrying about the L3 cache. For everything else I do (including running LLMs and compilers) it's beyond adequate. For a mere $20K I could have had an overall slower gaming experience but be able to locally run things like the Goliath 120B model, but that seemed like a poor trade-off.
snvzz 3y ago
Zen5 is meant to be released this year. Just not yet.

_cenw 3y ago

No, the "extreme gaming" line in the press release must have been chosen by someone that have no relation to AMD products and were just told "it does gaming without a GPU pretty good". Which is true, it does do that. These are less important CPUs in this lifecycle though, usually the G series are pretty good for a small computer where you don't want a dedicated tiny GPU, but all but one Ryzen 7000 desktop CPUs had integrated graphics (though, much fewer CUs).

dragontamer 3y ago

AMD is fleshing out the $100 to $250 market with this announcement. Top end $300+ chips (like 7800x3d) are safe. --------- I'm seriously considering the $250 5700x3d for my nieces, or maybe something cheaper. They don't need the latest-and-greatest PC. But having something "pretty good" (and the 5700x3d will be pretty good) is surely going to be appreciated.

PartiallyTyped 3y ago
It's a bit funny how the 5800x3d was creeping in the 7xxx series during launch.
- snvzz 3y ago
  That is my CPU. A great purchase in hindsight. Still great against Zen4, just not against an x3d Zen4.
  - dragontamer 3y ago
    I really want AVX512 on my AMD system (aka: 7xxx series) for maximum irony. So my upgrade will probably be that 7xxx series, probably 7800x3d. This was a feature I thought would appear on mainstream Intel systems first for the longest time. But no, Intel decided to leave it on higher-end Xeons only...
    - snvzz 3y ago
      I can't use my x3d anymore (my family does now), as I moved and left it behind. But I plan on zen5 x3d (at a minimum), or Zen6 if I can hold for that long. Zen+ laptop and some old board with 4790k cover the gap. I'll probably get a RX 7600XT for that haswell.