Is Samsung's an ultralow voltage part? The recent Samsung LPDDR4-4266 announcements I'm seeing don't mention an operating voltage, so I'd assume that part is running at the standard 1.1v.
Since this specification is 0.6V, they've tacked a X onto there to indicate this. I would suggest that while they both might be pin-compatible, the power delivery of LPDDR4X would have to be modified to supply the lower voltage to the package, therefore you couldn't just drop an LPDDR4X module into the socket taken by LPDDR4 (unless it was designed to supply both 1.1 and 0.6V).
Or they could have tacked an extra L onto the front, for LLPDDR4 instead...
Only the *output* voltage drops from 1.1 to 0.6V, everything else remains the same. So it does not involve "lower voltage supply to the package" in any way, just lower voltage output *from* the package. I don't know if the power delivery would need to be modified (I mean its voltage output stage), but LPDDR4X aware SoC controllers are certainly required.
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farmergann - Wednesday, January 11, 2017 - link
Is there a reason for the "x" in LPDDR4x here, or does this product share the same performance and interface as Samsung's 4266MHz LPDDR4(non-X)?DanNeely - Wednesday, January 11, 2017 - link
Is Samsung's an ultralow voltage part? The recent Samsung LPDDR4-4266 announcements I'm seeing don't mention an operating voltage, so I'd assume that part is running at the standard 1.1v.eldakka - Thursday, January 12, 2017 - link
LPDDR4 = 1.1V.Since this specification is 0.6V, they've tacked a X onto there to indicate this. I would suggest that while they both might be pin-compatible, the power delivery of LPDDR4X would have to be modified to supply the lower voltage to the package, therefore you couldn't just drop an LPDDR4X module into the socket taken by LPDDR4 (unless it was designed to supply both 1.1 and 0.6V).
Or they could have tacked an extra L onto the front, for LLPDDR4 instead...
philehidiot - Thursday, January 12, 2017 - link
Why "L" when "X" is so much cooler? You know being cool matters when it comes to LPDDR. Gets the chicks swarming round you.Santoval - Tuesday, May 15, 2018 - link
Only the *output* voltage drops from 1.1 to 0.6V, everything else remains the same. So it does not involve "lower voltage supply to the package" in any way, just lower voltage output *from* the package. I don't know if the power delivery would need to be modified (I mean its voltage output stage), but LPDDR4X aware SoC controllers are certainly required.