Intel demonstrates a 28-core processor running at 5GHz

Re:Intel demonstrates a 28-core processor running at 5GHz by ajross on Tuesday June 05, 2018 @12:11PM (#17239076)

You've gotten confused about how the numbers interact. The 2.5GHz is a base frequency calibrated to be under the TDP under all operating conditions[1], actual clocks are allowed to be higher (in particular when only a subset of cores are used), but subject to thermal throttling. The chip turbos to 3.8GHz in single core operation. Surely the 5GHz number is likewise a turbo rate.

This sounds extraordinarily doable to me. I'd be very shocked if this was anything but an off-the-shelf SKL-SP die with consumer fusing.

[1] And given that it's a server part, this calibration is inherently more conservative than you see in desktop stuff.

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Re:Intel demonstrates a 28-core processor running at 5GHz by loeg on Tuesday June 05, 2018 @02:28PM (#17240611)

That Cinebench score reflects a multi-threaded benchmark, which is not a workflow where the CPU would (or should, anyway) turbo a single core.

Also, while not AVX-intensive, CB does use some AVX, which usually draws more power (and thus limits clock more) than pure integer or even ordinary FPU computation.

Jumping from 3.8 GHz single core turbo to 5 GHz 28-core turbo is a big jump in power.

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