Bootup into BIOS first time after build and RAM frequency is not correct

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welchs101

Distinguished
Sep 18, 2008
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18,785
Hi,

I put together a system where I have an I5-7500 cpu.
MOB=Asus prime B250-plus
RAM=G.SKILL Ripjaws V Series 16GB (2 x 8GB) 288-Pin DDR4 SDRAM DDR4 2400 (PC4 19200) Intel Z170 Platform / Intel X99 Platform Desktop Memory Model F4-2400C15D-16GVR

Ram is supposed to run at freq of 2400MHz but when I boot up into bios for first time RAM memory freq says 2133MHz.

Any idea why?
 
Solution
C
Serial presence detect. In computing, serial presence detect (SPD) is a standardized way to automatically access information about a memory module. ... SPD is a memory hardware feature that makes it possible for the computer to know what memory is present, and what timings to use to access the memory.

https://en.wikipedia.org/wiki/Serial_presence_detect

Often memory manufacturers use conservative memory clock, DRAM Timing settings, DRAM voltage settings in order to make it easier to boot up. Some memory manufacturers use automatic overclocking. The memory will run in most DDR3 systems up to the speed allowed by the manufacturer's system BIOS. PnP (Plug and Play) cannot increase the system memory speed faster than is allowed by the...
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Calvin7

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Feb 19, 2013
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Serial presence detect. In computing, serial presence detect (SPD) is a standardized way to automatically access information about a memory module. ... SPD is a memory hardware feature that makes it possible for the computer to know what memory is present, and what timings to use to access the memory.

https://en.wikipedia.org/wiki/Serial_presence_detect

Often memory manufacturers use conservative memory clock, DRAM Timing settings, DRAM voltage settings in order to make it easier to boot up. Some memory manufacturers use automatic overclocking. The memory will run in most DDR3 systems up to the speed allowed by the manufacturer's system BIOS. PnP (Plug and Play) cannot increase the system memory speed faster than is allowed by the manufacturer's BIOS. It depends on what the memory manufacturer prefers selling.
 
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