Ddram disk – A PCIe card with 14x RAM slots
ddramdisk.store
Ddram disk – A PCIe card with 14x RAM slots
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Re: Ddram disk – A PCIe card with 14x RAM slots
#2What is the competitive advantage of this versus NVMe? Their 1TB ramdisk is $1000, while a Gen 4 NVMe PCI-e card gives the same speeds in a smaller and more standard format for $150-$200.
Re: Ddram disk – A PCIe card with 14x RAM slots
#3An underrated use case for this would be for storage of sensitive information. Information stored on a non volatile device is difficult to erase (Format NVM/ATA Secure require power cycle, hard drives require time to actually wile). Even if the data is encrypted, it is vulnerable to xkcd's "rubber hose decryption".
With DRAM, the storage media itself is fairly volatile and power removal/memory content initialization should be much faster.
Re: Ddram disk – A PCIe card with 14x RAM slots
#4What is the competitive advantage of this versus NVMe? Their 1TB ramdisk is $1000, while a Gen 4 NVMe PCI-e card gives the same speeds in a smaller and more standard format for $150-$200.
RAM doesn't have a fixed number of write cycles. It can be written to indefinitely, but NVME flash has an estimated number of TBs that it can write before it fails.
RAM is volatile (the data is destroyed when the power is cut), which can be a security feature. There appears to be a battery backup on these boards, but I imagine that it can be removed easily.
Re: Ddram disk – A PCIe card with 14x RAM slots
#5What is the competitive advantage of this versus NVMe? Their 1TB ramdisk is $1000, while a Gen 4 NVMe PCI-e card gives the same speeds in a smaller and more standard format for $150-$200.
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Re: Ddram disk – A PCIe card with 14x RAM slots
#6What is the competitive advantage of this versus NVMe? Their 1TB ramdisk is $1000, while a Gen 4 NVMe PCI-e card gives the same speeds in a smaller and more standard format for $150-$200.
Latency maybe?
Re: Ddram disk – A PCIe card with 14x RAM slots
#7Out of interest, would you get a similar bandwidth using DDRx on this card over PCIe, to using DDRx in the standard memory sockets on a motherboard
Edit: Looks like the slowest DDR4 gives 19200 MB/s https://uk.crucial.com/support/memory-speeds-compatability
Not sure what PCIe that card supports is though
Re: Ddram disk – A PCIe card with 14x RAM slots
#8Is this for real? The store, which looks pretty amateurish, has no products for sale ("out of stock") and the prices are vastly too good to be true.
DDR3 memory for 40c per gigabyte? Cheapest I can see on Amazon is 5 times that. 256GB of memory (plus the board itself) for $280? Not possible.
Sorry, I don't believe it.
Re: Ddram disk – A PCIe card with 14x RAM slots
#9Out of interest, would you get a similar bandwidth using DDRx on this card over PCIe, to using DDRx in the standard memory sockets on a motherboard Edit: Looks like the slowest DDR4 gives 19200 MB/s https://uk.crucial.com/support/memory-speeds-compatability Not sure what PCIe that card supports is though
I haven't kept up with the speed and feeds, but in general PCI bandwidth is a decimal order of magnitude less than all the memory controller bandwidth
Re: Ddram disk – A PCIe card with 14x RAM slots
#10Out of interest, would you get a similar bandwidth using DDRx on this card over PCIe, to using DDRx in the standard memory sockets on a motherboard Edit: Looks like the slowest DDR4 gives 19200 MB/s https://uk.crucial.com/support/memory-speeds-compatability Not sure what PCIe that card supports is though
Looks like the card is PCIe 4.0 x4, which gives about 8GB/s. Not sure if this board is driving the RAM at full speed, or how many controllers there are, but more lanes could make this faster.