The reason that I prefer this method is that it exposes some of the shortcomings of certain processors that prevent them from achieving their theoretical peak flop value.įor example, circa 2014, NVIDIA GPUs did integer and floating-point operations on the same pipeline. If the server market leads on early adoption, late 2021 or early 2022 might be more realistic.I understand that you asked for the theoretical value, but as this is nearly always inaccessible by any real code, even LINPACK, you might want to just run (optimized) DGEMM for very large matrices.
This may also imply that companies like AMD will keep AM4 around a little longer than we thought - originally, it was thought that we might see DDR5 adoption by 2020 or 2021. Each DIMM will provide its own voltage regulation (JEDEC calls this philosophy “pay as you go.”)ĭDR5 will likely debut next year, possibly in servers first, to be followed by desktop hardware. The advantage to this, at least in theory, is that the motherboard’s DRAM voltage regulation hardware doesn’t have to be built to handle a worst-case scenario. This is expected to reduce motherboard cost and complexity, at the cost of some increased cost per-DIMM. Going forward, every type of DIMM will contain its own integrated voltage regulator. Typically, the voltage regulators for DRAM have been located on the motherboard. One major change to the DRAM specification with DDR5 is the use of onboard voltage regulators. Unlike in the past, when new DDR memory speeds took over for the old standard at its previous frequency level, DDR5 is expected to launch at DDR5-4800, not DDR5-3200.
These, however, will be server deployments not intended for the standard consumer market. LRDIMMs are expected to stack up to eight dies per chip, which is where the 2TB figure comes from. The size of the decrease is half the size of the one from DDR3 to DDR4, where voltage fell from 1.5v to 1.2v, so it’ll be interesting to see how many power advantages DDR5 brings to the table over DDR4. Voltage (Vdd and Vddq) have both dropped, from 1.2v with DDR4 to 1.1v with DDR5. This effectively wastes a great deal of bandwidth fetching data that the CPU doesn’t want and likely can’t use.Īdopting 2x 32-bit channels per DIMM allows JEDEC to double the burst length and improve efficiency, since the two banks can operate independently of each other. With a burst length of 16, a 64-bit channel would fetch 128 bytes / 1024 bits of data.
Standard cache lines are 64-bytes long, and this is the default expected size for memory operations. The reason for the channel shift has to do with the increased burst length.
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