3 ms·

It almost makes me think the TDP of either the 3800x or 3700x is a publishing mistake. 3.6/4.4 to 3.9/4.5 on the same hardware can't possibly require such a dr

It almost makes me think the TDP of either the 3800x or 3700x is a publishing mistake. 3.6/4.4 to 3.9/4.5 on the same hardware can't possibly require such a dramatic voltage increase to go from 65w to 105w. If it does, it means the process is struggling to produce chips at that speed, so the headroom is incredibly low and you can forget about overclocking.

AstralStorm 7y ago
Same as with Threadripper which eats 300W or so at 4GHz with applicable overvolting. (Rated 180W, you can overvolt it hard, even to 1.55V, if you can dissipate 450W, to get humongous 4.2G all core.)
kllrnohj 7y ago
It doesn't take much of a voltage increase at all to send power usage skyrocketing. That said the part you're missing is binning. The 3800x is definitely the worst binned chiplets, as evidenced by the 3900x and 3950x having the same TDP.
- paulmd 7y ago
  TDP is just a number these days. You're not getting 4 more cores for free, you're getting a cap put on your all-core power consumption at a lower clock rate. More cores, lower all-core boost clocks (the advertised clocks are single-core boost). Even then, both AMD and Intel CPUs will pull significantly above their rated TDP when boosting. It's not quite a base-clock measurement (eg 9900K is more like 4.3-4.4 when 95W-limited) but it's definitely not a boost power measurement either. Again, pretty much just a marketing number these days.
  - kllrnohj 7y ago
    > You're not getting 4 more cores for free, you're getting a cap put on your all-core power consumption at a lower clock rate. There's a mere 100mhz difference in base clock. Which is what TDP is based off of. No where close to enough of a reduction to fully explain +50% cores at the same TDP > Again, pretty much just a marketing number these days. Not really no. You just need to understand it represents all core base frequency thermal design target, and not maximum power draw. It's still based in reality, though. It's not some random made up number. And binning is an extremely real thing with very significant impact. Not sure why you seem to be trying to outright dismiss it.

AstralStorm 7y ago

Same as with Threadripper which eats 300W or so at 4GHz with applicable overvolting. (Rated 180W, you can overvolt it hard, even to 1.55V, if you can dissipate 450W, to get humongous 4.2G all core.)

kllrnohj 7y ago

It doesn't take much of a voltage increase at all to send power usage skyrocketing. That said the part you're missing is binning. The 3800x is definitely the worst binned chiplets, as evidenced by the 3900x and 3950x having the same TDP.

paulmd 7y ago
TDP is just a number these days. You're not getting 4 more cores for free, you're getting a cap put on your all-core power consumption at a lower clock rate. More cores, lower all-core boost clocks (the advertised clocks are single-core boost). Even then, both AMD and Intel CPUs will pull significantly above their rated TDP when boosting. It's not quite a base-clock measurement (eg 9900K is more like 4.3-4.4 when 95W-limited) but it's definitely not a boost power measurement either. Again, pretty much just a marketing number these days.
- kllrnohj 7y ago
  > You're not getting 4 more cores for free, you're getting a cap put on your all-core power consumption at a lower clock rate. There's a mere 100mhz difference in base clock. Which is what TDP is based off of. No where close to enough of a reduction to fully explain +50% cores at the same TDP > Again, pretty much just a marketing number these days. Not really no. You just need to understand it represents all core base frequency thermal design target, and not maximum power draw. It's still based in reality, though. It's not some random made up number. And binning is an extremely real thing with very significant impact. Not sure why you seem to be trying to outright dismiss it.