Hi David,
On 03.09.2018 19:13, David Potocnik wrote:
Coreboot, or perhaps rule it out completely?
it's impossible, unless you want to heavily mod the mainboard. Ivy Bridge supports 4 ranks per channel, max 4GiB per rank. SO-DIMMs have only 2 ranks. So with 2 SO-DIMM slots, there are physical connections missing to get to 32GiB.
Information on RAM frequencies is welcome as well:
I've also heard reports of people running the RAM at 1866Mhz. A newer version of the official BIOS reduced the original 1666Mhz, to 1333Mhz. I believe there's a mod available that over-rides this: http://x220.mcdonnelltech.com/resources/
How is this currently on Coreboot?
coreboot limits the frequency to whatever the board manufacturer con- figured the chipset to (using one-time programmable fuses). It can be configured, however, to ignore the fuses. Then it would use whatever the RAM supports up to the CPU's limit. This is overclocking so there is no guarantee that it would work on one X230 sample just because it works on another. And there is probably no real-world application that would benefit (2 x DDR3-800 is already quite fast compared to what Ivy bridge can do with the data).
Hard to tell why Lenovo lowered the frequency late. Maybe because there was no performance impact but it saves power?
Nico
Thanks very much sir!
I guess it makes most sense to just have two of these machines side by side, and split the workload. ;-)
On 3 September 2018 at 19:30, Nico Huber nico.h@gmx.de wrote:
Hi David,
On 03.09.2018 19:13, David Potocnik wrote:
Coreboot, or perhaps rule it out completely?
it's impossible, unless you want to heavily mod the mainboard. Ivy Bridge supports 4 ranks per channel, max 4GiB per rank. SO-DIMMs have only 2 ranks. So with 2 SO-DIMM slots, there are physical connections missing to get to 32GiB.
Information on RAM frequencies is welcome as well:
I've also heard reports of people running the RAM at 1866Mhz. A newer version of the official BIOS reduced the original 1666Mhz, to 1333Mhz. I believe there's a mod available that over-rides this: http://x220.mcdonnelltech.com/resources/
How is this currently on Coreboot?
coreboot limits the frequency to whatever the board manufacturer con- figured the chipset to (using one-time programmable fuses). It can be configured, however, to ignore the fuses. Then it would use whatever the RAM supports up to the CPU's limit. This is overclocking so there is no guarantee that it would work on one X230 sample just because it works on another. And there is probably no real-world application that would benefit (2 x DDR3-800 is already quite fast compared to what Ivy bridge can do with the data).
Hard to tell why Lenovo lowered the frequency late. Maybe because there was no performance impact but it saves power?
Nico
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David Potocnik -
Nico Huber