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> doesn't let the chip exceed its nominal TDP for short (or not so short) bursts the way x86 processors do.

That's more of an artifact of how TDP is defined than anything else. I doubt that this could peg even a single core at 3.0 GHz given a reasonable cooling setup, let alone run all cores @ 3.0 GHz.

Why do you think this won't keep a single core at 3.0GHz?

You can get ~3.4GHz average sustained all-core speed on a 3990x (64-core, nominal 280W TDP). This is with an off-the-shelf AIO cooler.[0]

Note: top-end air coolers are often competitive with AIOs, and can be had for $80-$100.[1]

If you're buying a several thousand dollar CPU, dropping even $500 (much higher than you'd need for closed loop liquid or high-end air cooling) on cooling doesn't seem unreasonable.

[0] https://www.anandtech.com/show/15483/amd-threadripper-3990x-...

[1] https://www.youtube.com/watch?v=7VzXHUTqE7E

Neither the AIO nor the large tower (air) cooler are going to fly in a sever rack.

No. Servers will be utilizing jet-sounding fans, or air conditioned intake, or rack-level water cooling, or any number of other cooling solutions that can handle high the heat output.

250W is not an absurd figure to shove in a server CPU. If you're buying an 80-core CPU, you're not going to be skimping on the cooling solution.

Especially given the target market for Ampere is cloud providers, you can expect these to be racked in enclosures that provide sufficient cooling for their operational needs.

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