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To: Joe NYC who wrote (3913)6/26/2008 1:50:35 AM
From: NicoV  Respond to of 4590
 
IMO, it would be possible to make a system that uses both, but it is a much more challenging proposition. You need to have a chipset, BIOS, mobo and OEM willing to work with you, and time to market would be in years.


Maybe not so challenging. Current multi socket Opteron systems are already NUMA systems, and the operating systems are already NUMA aware. You could put DRAM in the DIMMS connecting to one of the CPU sockets, and EcoRAM in all the others. The only thing that isn't yet in place is telling the OS not to use the EcoRAM for normal operations. And your applications would have to be adapted to read their data from the EcoRAM NUMA memory pool, but since search is all custom software, this is probably not much of a problem.



To: Joe NYC who wrote (3913)6/26/2008 5:40:30 AM
From: Woerns  Respond to of 4590
 
Joe,

AMD was working at one point with a SOI memory technology that would greatly increase density over SRAM, allowing 10s or even 100s of MB of L3 cache. I don't know where that went...

Embedded DRAM was recently presented at the VLSI Symposium 2008.
A One MB Cache Subsystem Prototype with 2GHz Embedded DRAMs in 45nm SOI CMOS
vlsisymposium.org
See page 17 for the announcement:
Regards