When you don’t have a hand in a server day in and time out, it was maybe not apparent why some Skylake servers when launched had eight reminiscence slots. The Skylake-SP based mostly Xeon platform solely had six reminiscence channels, so every socket ought to have had six or twelve reminiscence slots, however for some purpose we noticed techniques with eight and didn’t know why on the time.
Maybe much more confusingly, not one of the product managers I converse to regularly may give me a straight reply as to why these techniques had eight reminiscence slots per socket. The perfect reply I used to be given was that earlier era processors had been quad-channel, so by having eight DIMMs they might switch costly reminiscence throughout techniques. It will imply a scenario the place of the six channels within the new processors, two of these channels would run at two DIMMs per channel, and the others can be at one DIMM per channel. The configuration is odd, positive, however we’ve seen it up to now on motherboards just like the EX58-UD3 that had a three+1 for a tri-channel system.
When Intel formally showcased Apache Cross, or what’s now often known as Optane DC Persistent Reminiscence (or Optane DIMMs), it grew to become clear that these ‘additional’ slots had been formally designed for it. On the Optane DIMM launch, Intel was coy concerning the adaptability of the brand new reminiscence, deciding to carry again on the reply as as to if the brand new Optane DIMMs and DDR4 had been interchangeable (as they’re pin-compatible), though solutions have been provided by Charlie from Semiaccurate. Earlier within the 12 months, Paul over at Tom’s showcased a diagram of a Lenovo system that exhibited a block diagram of two DIMMs of Optane per socket, with every of these backed by one other DDR4 module.
Intel has clarified that the brand new Optane DC Persistent Reminiscence will solely be suitable with their subsequent era of processors, nevertheless we do know that Optane DIMMs had been initially set for the Skylake-SP platform. The 2 processor households are nonetheless meant to be socket suitable, however server makers had system setups in place for Optane DIMMs again at Skylake-SP launch. When you’ve ever puzzled what these additional coloured reminiscence slots are, there you go. GIGABYTE had some on show at their sales space, therefore a brief replace.
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