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Yes, the Xeon Platinum 8180 had 28 cores clocked at 2.5Ghz with a TDP of 205W. I don't see how they could pull off 5Ghz this year, apart from using LN2...
by ucha 8y ago
Yes, the Xeon Platinum 8180 had 28 cores clocked at 2.5Ghz with a TDP of 205W. I don't see how they could pull off 5Ghz this year, apart from using LN2...
- ajross 8y agoYou'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.
- loeg 8y agoThat 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.