Windows not reporting ram at full speed

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liamprice00

liamprice00

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Feb 13, 2018
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I currently have 1 8GB stick of Corsair Vengeance LPX DDR4 @ 2400mhz (I'm waiting to buy another because prices are so high right now.) When I boot into my BIOS it reports my ram running at full speed but when I check both Task Manager and CPU-Z they report my ram at only 1200mhz. Could this be Windows and CPU-Z misreporting speeds or is it because I'm running my ram in single channel right now or is there something else I'm missing like a tweak in the XMP profile maybe? Thanks
 
Solution
BFG-9000
Double data rate (DDR) transfers data on both the rising and falling edges of the clock signal. Therefore DDR at an actual 1200MHz functions as fast as SDR would at 2400MHz--the "2400" is an effective speed in MT/s.

Note this only refers to the i/o bus from the memory controller to the sticks. The actual memory chips themselves for DDR4-2400 PC4-19200, run at only 300MHz internal memory clock. You can think of DDR4 as 8 ranks of chips in RAID0 to create enough bandwidth to fill or saturate that i/o.
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BFG-9000

BFG-9000

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Double data rate (DDR) transfers data on both the rising and falling edges of the clock signal. Therefore DDR at an actual 1200MHz functions as fast as SDR would at 2400MHz--the "2400" is an effective speed in MT/s.

Note this only refers to the i/o bus from the memory controller to the sticks. The actual memory chips themselves for DDR4-2400 PC4-19200, run at only 300MHz internal memory clock. You can think of DDR4 as 8 ranks of chips in RAID0 to create enough bandwidth to fill or saturate that i/o.
 
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