On 5/14/23 13:01, Lennart Sorensen via talk wrote:
On Fri, May 12, 2023 at 06:31:47PM -0400, D. Hugh Redelmeier via talk wrote:
| From: D. Hugh Redelmeier via talk <[email protected]>
| So this is what I bought for $159.99:
|
<https://www.canadacomputers.com/product_info.php?cPath=24_311_1326&item_id=195989>
Surprise: The ThinkCentre M75s gen 2 SFF seems this RAM as DDR-2400!
Why???
Even though it is advertised as DDR-3200, when you read the
specifications, it will only run at 3200 under XMP.
<https://www.kingston.com/datasheets/KF432C16BBK2_64.pdf>
FACTORY TIMING PARAMETERS
• Default (JEDEC): DDR4-2400 CL17-17-17 @ 1.2V
• XMP Profile #1: DDR4-3200 CL16-20-20 @ 1.35V
• XMP Profile #2: DDR4-3000 CL16-19-19 @ 1.35V
XMP is an Intel "standard" and cannot be used by AMD systems (like the
M75s).
There are hacks for AMD. For example Asus' DOCP. But a business
computer line like the ThinkCentre is unlikely to use that.
Now I have to return a second set of RAM. Canada Computer might not
be as accomodating as Amazon.
I wonder how one searcsh for "DDR-3200 RAM, no REALLY DDR-3200 RAM".
Good question. I think one needs to somehow find ram that is 3200 and
1.2V explicitly. The ones using XMP profiles seem to be 1.35V at
that speed.
This for example looks right:
https://www.amazon.ca/Crucial-2x16GB-Desktop-Memory-CT2K16G4DFRA32A/dp/B07ZLD6Q1G/
I guess you hit the same problem as this review:
https://www.amazon.com/review/R17NJ5JNV9HE4D/
XMP or a version is on AMD. The problem your running into is CPUs these days
default to a certain Ram Speed. I'm not sure of what gen your on for the
Thinkpad but googling default memory speed of gen X, where X is your gen should
resolve that issue. If you need to go helper than you need XMP or the AMD
version to go beyond the default speed. For sure,3200 is beyond that for memory
with current gen.
Nick
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