Talk:LPDDR

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LPDDR vs multichannel DDR3 SODIMM

LPDDR3 will debut in 2013, running at 800 MHz DDR (1600 MT/s), offering bandwidth comparable to PC3-12800 notebook memory in 2011 (12.8 GB/s of bandwidth).[6] However, even though it offers the same memory bandwidth as notebook memory from 2011, mobile CISC processors still operated at even greater bandwidth by utilizing dual channel memory, effectively doubling the bandwidth.[citation needed][dubious – discuss] More accurately this will allow low power RISC processors to have the same memory bandwidth as mobile CISC processors from around 2006–2007.

Why 'citation' and 'dubious'? Many notebook CISC CPUs have multichannel DDR3 controller, e.g. List_of_Intel_Core_i7_microprocessors#Mobile_processors (intel models of 2010-2011; same for i3 and i7):

"Clarksfield" - 2 × DDR3-1333
"Arrandale" - 2 x DDR3-1066 or 2 × DDR3-800
"Sandy Bridge (Dual-Core)" - 2 x DDR3-1066/1333 [1]
"Sandy Bridge (Quad-Core)" (32 nm) - 2 x DDR3-1066/1333/1600 [2]

And AMD mobile 2010-2011: List_of_AMD_mobile_microprocessors#Nile_platform_.282010.29, based on S1G4 socket with dualchannel DDR3 [3] "socket supports dual-channel DDR3 memory with data rates up 1333 MHz"; next socket FS1 of 2011-2012 has 2 channel memory too: [4] "FS1 works with dual-channel DDR3 memory with data rates up 1600 MHz".

So, I think, this is clear enough that normal 2010-2011 notebooks (not netbooks) were capable of multi-channel (dual-channel) DDR3 with the same MT/s, so double bandwidth of single-channel LPDDR3. The only RS that can be needed here is RS for using single-channel LPDDR in most of smartphones/tablet PC. E.g. Tegra platform had single-channel memory in Tegra 2, Tegra 3 and Tegra 4i; only Tegra 4 has dual-channel "LPDDR3 up to 933". Snapdragon 600 and 800 are dual-channel too. ]Apple Ax are from Single-channel LPDDR up to Quad-channel LPDDR2. Exynos 5 are dualchannel LPDDR3, OMAP 5 is dualchannel LPDDR2.

Many multichannel mobile ARM SoCs are with 32-bit width memory bus, while notebook DDR3 SDRAM (SODIMM) is still 64 bit wide. `a5b (talk) 20:26, 23 April 2013 (UTC)[reply]