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It really isn't very bad; Intel is very overpriced relatively if you're talking about e.g. $/core or $/thread at a similar TDP. The bandwidth in P9 chips is pretty high, and they have huge amounts of L3 cache compared to any price-comparable Intel purchase. They also have a significantly higher thread count (SMT4), and comparable PCIe lane count for peripherials vs up-to $8,000 xeons. The individual cores are also very fast: it's not like those ARM64 servers that tried to win by having many slow cores. The cores are fast, and there are a lot of them. Things like COTS networking blades and big-ass database servers are going to be their prime turf, I think. I actually have an Excel spreadsheet open right now with some preliminary numbers (evaluating some random specs from a recent Anandtech article, along with Sforza CPUs, out of curiosity), and in terms of $/thread, the Sforza CP9M06, an 8-core 4SMT chip for $600, is only beaten in $/thread by a Cavium ThunderX2 9980-2200, at $18.5/core vs $14.02/core, thanks to 128 threads. But, at a price of $1,800, with a significantly lower base/turbo clock frequency (3.5GHz+ vs 2.2+) and less than 1/2th the L3 cache. Granted, these numbers are more or less impossible to verify at this moment and unbelievably fuzzy, and it's incomplete without filling in all the data on a wider array of Xeons, EPYC machines, and real benchmarks. But the back of the envelope numbers come off as pretty solid, and my experience with POWER8 makes me think these machines will perform very well. There is also the fact that IBM is quite open about POWER this time around, all the way to making all their firmware/boot/BMC code open, and encouraging patches, under FOSS licenses, and making all the architecture/firmware documentation freely available. Might not matter for hyperscale data centers that negotiate themselves, but certainly a nice bonus. The biggest price-related barrier at the low end is really the cost of the mobos, though. That's where most of the TALOS II's price goes to. The CPUs are relatively cheap in comparison. |