Gigabyte Leaks AMD Zen 4 Details: 5nm, AVX-512, 96 Cores, 12-Channel DDR5


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Gigabyte is not having a fantastic month. The corporation was strike by an attack that stole 112GB of facts off its servers last 7 days, like (apparently) info on AMD’s upcoming Genoa servers, centered on its Zen four architecture.

Zen four is not predicted to launch in the around future. The subsequent server CPU envisioned from AMD is Milan-X, which will mix 64MB of vertically mounted L3 cache for every chiplet with an present Zen 3 main, or up to 512MB of more L3 in whole. Zen 4, when it arrives next yr, will bring a series of elementary modifications (and, presumably, will continue to keep its bigger L3 cache).

The leaked paperwork, if exact, describe a Zen four Genoa server CPU with up to 96 cores and 12 channels of DDR5 memory rated at DDR5-5200. This will work out to 50 % a terabyte of memory bandwidth in overall. When the selection of memory channels for every chiplet stays the similar (a single), the huge L3 cache improve expected from Milan-X, blended with Genoa’s one.62x maximize in memory bandwidth, will continue to keep the core fed like hardly ever right before. If AMD builds a top-conclusion workstation chip out of this main, we’d expect it to be fewer memory-bandwidth-bound than the Threadripper 3990X for these two factors alone.

The leak also reveals that TDPs on Genoa servers will be headed upwards, from the existing 280W to 320-400W for the prime goods. The 64-main 400W TDP variant proven over will presumably strike larger frequencies than the 96-main variant. Be aware that there is an even bigger 700W concentrate on that the CPU is permitted to hit for 1ms or significantly less.

As for the AVX-512 assert, there is a unique doc mentioning AVX-512 support in upcoming AMD processors.

Even with the change to 5nm, adding features like AVX-512 means the genuine chiplet dimensions haven’t altered a great deal. The boost in power use from Milan to Genoa is in all probability relevant to a selection of elements, together with elevated L3 cache (we’re assuming this attribute carries over from Milan-X), elevated interconnect energy to retain all 96 cores fed, and the power specifications of AVX-512. Intel embraced AVX-512 several years in the past, in spite of the fact that it carries a large power penalty and calls for a CPU to operate at reduced frequencies to keep in just thermal boundaries. AMD may be selecting up the attribute now that the effects is lesser.

These leaks are broadly in line with what we envisioned, but they affirm that AMD is likely to commence nudging core counts upwards again. Immediately after introducing 16 cores on the desktop and 64 cores in workstations and servers, AMD has supplied the market place a few many years to digest the advancements. We’ve viewed a sharp increase in the quantity of avid gamers with six-core and eight-core chips more than the previous 12 months, suggesting that avid gamers are in fact using advantage of the increased main counts now on offer you from AMD and Intel. It is not a provided that AMD intends to improve shopper desktop main counts, but bumping up to 96 cores at the top of the stack offers the enterprise some respiration room.

As often, rumors and leaks must be taken with a grain of salt. Hat-tip to for the info.

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