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Technically it acts like memory. The dev kit comes with a device driver that makes it look like a block device though, which would be analogous to something lik
by jpgvm 12y ago
Technically it acts like memory. The dev kit comes with a device driver that makes it look like a block device though, which would be analogous to something like NVMe.
- solarexplorer 12y agoIIRC a single DDR3 slot can address max 8GBytes. So the driver will have to map the 400GB Flash into this window.
- Dylan16807 12y agoDDR3 supports 8gbit chips and you can shove 16 onto one DIMM, so 16GB. But that leaves 3 address lines unused for column select. Theoretically they could make a 64GB or 128GB board. Also LRDIMMs can go up to at least 64GB. DDR4 directly supports 512GB, and also throws away three potential column address bits.
- jhallenworld 12y agoWell at the interface level it has to look like memory since it's attached to a memory bus. But that does not mean it looks like a single large DIMM. There is no way in the DRAM protocol to delay a transaction while data is read from the flash chips into the buffer, so you need a protocol on top of the simple memory model. "nvDIMMs" on the other hand do look like and are as fast as plain memory. Disadvantage is that they are not big.