12-22-2018 08:15 AM
Is there any possible explainations as to why the RAM speed is restricted to 2400 MHz even tho they are designed for 2666MHz, and the fact that i7-8850H does support 2666MHz?
(Yeah Ik that’s what it says in the configuration page and I paid for 2400 MHz, but it would be quite unreasonable since 1) it is a 2666 MHz RAM in there, and 2) there is no option for 2666 MHz RAM configuration.)
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12-22-2018 09:21 AM - edited 12-22-2018 09:24 AM
Looking at the platform specs, it describes 2400 as the speed limit and says it is an Intel limitation. I was curious and tried to check the capabilities of the chipset ( CM246).
I found this document:
A lot of it is over my head, but way down on page 181 it talks about the I2C bus speed of 2400. I think that's all you can get. Memory comes much faster for applications that allow overclocking, but your CPU doesn't allow that process, and the cooling and power supply would also be affected.
12-22-2018 10:52 AM - edited 12-22-2018 10:53 AM
I ordered a P72 with 2x8 GB RAM labeled as 2400 Mhz and received it with 2666 Mhz RAM instead. Brand is Samsung.
12-22-2018 05:12 PM
The 2666 ram is certified to run at bus speeds, up to 2666. In this case, it will run at 2400
12-23-2018 11:57 AM
Regarding this issue, I have a P52 with the Xeon E-2176M processor and 32 GB Samsung DDR4-2666 (PC4-21300) memory.
However, when I run HWINFO32 or CPUZ, they both report the clock rate for the memory to be 1200 MHz (12 x 100 MHz).
What don't I understand ?
12-23-2018 12:13 PM - edited 12-23-2018 12:13 PM
@pjg I have learned that free software (and some commercial SW) often does a poor job of dealing with new and uncommon kinds of hardware, like your mobile xeon
12-23-2018 12:55 PM
Is this one of those classic deals where the utility shows actual clock frequency, but since it's DDR (dual data rate) it's actually running at 2x the shown speed?
Per the interwebs, that seems to be how HWINFO reports RAM clock rate.
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