Re: How to disable XMP on memory?

"Mr. Man-wai Chang" <[email protected]>
Newsgroups alt.comp.hardware.pc-homebuilt
Organization https://sites.google.com/site/changmw/
Message-ID <[email protected]>
On 24/12/2025 1:24 am, Paul wrote:
> 
> They're the same as the ones I've got.
> 
> 2133 as slowest JEDEC.
> 3200 as XMP rate       DDR4-3200 (1600MHz)

Late reply:

I checked my DDR4-3200 moduels. Their JEDEC (#8) is rated 2400, as 
reported by CPU-Z, if I didn't misunderstand what you called "slowest 
JEDEC".

Following is the relevant section from CPU-Z:

DIMM #				1
	SMBus address		0x50
	Memory type		DDR4
	Module format		UDIMM
	.....
	Size			8192 MBytes
	Max bandwidth		DDR4-3200 (1600 MHz)
	Max JEDEC		DDR4-2400 (1200 MHz)
	....
	Nominal Voltage		1.20 Volts
	....
JEDEC timings table		CL-tRCD-tRP-tRAS-tRC @ frequency
	JEDEC #1		9.0-9-9-22-31 @ 666 MHz
	JEDEC #2		10.0-11-11-25-35 @ 766 MHz
	JEDEC #3		11.0-12-12-27-38 @ 833 MHz
	JEDEC #4		12.0-12-12-29-41 @ 900 MHz
	JEDEC #5		13.0-13-13-31-44 @ 966 MHz
	JEDEC #6		14.0-15-15-35-49 @ 1066 MHz
	JEDEC #7		15.0-16-16-37-52 @ 1133 MHz
	JEDEC #8		16.0-16-16-39-55 @ 1200 MHz
	JEDEC #9		18.0-16-16-39-55 @ 1200 MHz
	JEDEC #10		20.0-16-16-39-55 @ 1200 MHz
XMP profile			XMP-3200
	Specification		DDR4-3200
	VDD Voltage		1.350 Volts
	.....

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