On Jan 5, 2018, at 23:49, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
On Sat, Jan 6, 2018 at 6:35 AM, Richard Wilbur richard.wilbur@gmail.com wrote:
So the trick is how to choose a faster chip and integrate successfully into a system running at lower speed than it is specified for?
yyup. have to use the 1800mhz 1.5v x8 DDR3 IC, which fortunately happens to be down-compatible with 667mhz. the 1.35v DDR3L variant of the same chip is *not*.
I was doing a little reading about DDR3 and noticed the 1.35V DDR3L memory chips are happy talking/running with 1.5V DDR3 systems.[1] So are you saying the 1800mhz 1.35v x8 DDR3L IC is not happy running at 667MHz? (Clock rate incompatibility versus voltage incompatibility?)
References: [1] https://en.m.wikipedia.org/wiki/DDR3_SDRAM