Unless you overclocked it, that is not strange.I think the eDRAM doesn't do much because it's still DRAM. It's a little lower latency, but it still has the long refresh cycles, because DRAM constantly leaks.
What CPUs really need on-die is static RAM, which can be clocked to very high speeds, but SRAM is much bigger than DRAM, and runs hot. That's what current CPUs use as cache, and that's why there isn't much of it. AMD, with its stacked static RAM on the X3D chips, gets major performance wins out of it, but has to clock the CPUs down because cooling through the SRAM layer on top is substantially harder.
(Weirdly, I get better temps out of my 5800X3D than I did out of my 5800X, but that might be better CPU goop or a better application on my part.)
5800X3D : 3.4ghz, boots to 4.5
5800X : 3.8ghz, boosts to 4.7
The X3D models (including the cache core in a 7950X3D, but not the other) are set a bit lower in their power curve.
They could be better binned to make it less of a concern, but I am not sure. At least in the case of the 7000 series X3D chips, it was hard to get them to reach TDP without turning PBO on. My 7800X3D only drew 90W or so during a stress test with it off, and less in most operation.
Looking it up, I see reviewers are getting numbers like 82W under full load, so that is not so unusual (a fair bit more for the 5800X3D, I am not sure what to make of that).
https://www.anandtech.com/show/1879...eview-a-simpler-slice-of-v-cache-for-gaming/2
TDP is like 120, and it should be able to do 160 for bursts, but it does not get anywhere near that.
I got about 130W at full load on a 7950X3D where they get 144W, so it appears there is some variance on all of them.
I keep it off just because that is a really marginal performance difference, and at 90W (or 130 to a slightly lesser degree), setting an appropriate time averaged power curve with a D-15 means by far the loudest thing in that computer is coil whine from various components (none in particular are bad, it requires being fairly close to hear that) or maybe video card fans when that is operating (although those are numerous and large enough that they also can be set fairly slow).
It is much like why a notebook chip of the same type sips power in comparison to the biggest desktop version, except less so. They set it such that a worst case scenario is not so bad, and most chips will be way under this. They mean it on the limits though, including voltage and such, and so you are less able to make changes which would push it closer to the actual limits for your chip.
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