By: SHK (nomail.delete@this.mail.com), October 9, 2012 12:55 pm
Room: Moderated Discussions
Michael S (already5chosen.delete@this.yahoo.com) on October 9, 2012 10:33 am wrote:
> Kevin G (kevin.delete@this.cubitdesigns.com) on October 9, 2012 9:48 am
> wrote:
> >
> > If that is the density level, why not just go
> > to an
> SRAM implementation? Shouldn't SRAM density be comparable to RLDRAM?
> >
>
>
> May be it shouldn't. But it isn't.
> According to digikey, the densest SSRAMs
> right now are Cypress 144 Mbit devices. $200 apiece in a lot of 500.
> For
> comparison, 576 Mbit RLDRAM will cost you $40 in a lot of 1,000.
> Also, RLDRAM
> will give you higher bandwidth per pin.
>
IIRC GSI-Technology makes some very fast SRAM with 288Mbit density, but i'm
not sure if it's already in full production.
RLDRAM is still a DRAM so it stores 1 bit in 1 capacitor making it's denser
than a SRAM which uses at least 4 transistor for bit.
What puzzles me is that seems that even in the HPC sector the memory used is the same kind of
cost-optimized DRAM which goes in a desktop pc. Hardly an "high-performace" choice
> Kevin G (kevin.delete@this.cubitdesigns.com) on October 9, 2012 9:48 am
> wrote:
> >
> > If that is the density level, why not just go
> > to an
> SRAM implementation? Shouldn't SRAM density be comparable to RLDRAM?
> >
>
>
> May be it shouldn't. But it isn't.
> According to digikey, the densest SSRAMs
> right now are Cypress 144 Mbit devices. $200 apiece in a lot of 500.
> For
> comparison, 576 Mbit RLDRAM will cost you $40 in a lot of 1,000.
> Also, RLDRAM
> will give you higher bandwidth per pin.
>
IIRC GSI-Technology makes some very fast SRAM with 288Mbit density, but i'm
not sure if it's already in full production.
RLDRAM is still a DRAM so it stores 1 bit in 1 capacitor making it's denser
than a SRAM which uses at least 4 transistor for bit.
What puzzles me is that seems that even in the HPC sector the memory used is the same kind of
cost-optimized DRAM which goes in a desktop pc. Hardly an "high-performace" choice
