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December 31st, 2020 05:00
Aurora R8, Corsair Vengeance RGB DDR4-3200
Hi,
I bought these Corsair Vengeance RGB 2x16GB at the same time as my Aurora R8 to upgrade from 8GB-32GB directly.
They have been running fine. Having upgraded my GPU yesterday, I have been monitoring stats all the time, and what caught my eye was CPU-Z showing the DRAM frequency at 1066Mhz.
I dug around here, found discussions on XMP, and on wikipedia about XMP here to try to understand why.
So I looked in the BIOS, XMP was disabled, I enabled it and here are the CPU-Z results:
Something seems wierd, the first shows DRAM frequency at 1595Mhz which is ok, but I wonder about other things shown, can anyone explain...
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r72019
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December 31st, 2020 09:00
You go off the memory tab, it looks like your RAM has two xmp profiles, your pc supports one of them, and you're running the supported xmp profile (3200).
The spd tab shows the supported settings, jedec standards and xmp.
The xmp primary timings are set by the manufacturer, and vary. There is no standard timings accross all brands for xmp. The faster the speed the slower (higher) generally those other timings.
It shows that because xmp is a oc setting. That is the base non oc frequency.
markburv
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December 31st, 2020 05:00
Why does the Max Bandwidth show DDR4-2132 (1066Mhz) when the memory is really DDR4-3200?
Why does the RAS to CAS and RAS Precharge show both 18, when on wikipedia DDR4-XXXX table shows higher values for DDR4-3200 and lower values for DDR4-2133?
markburv
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December 31st, 2020 10:00
Thanks for the reply @r72019
So in short, if the memory tab is the tab giving the memory status info, then all seems ok, right? memory is running in dual channel 1600Mhz and thus as specified as DDR4-3200.
Note the 3200 is also in the serial number CMR32GX4M2C3200C16.
Peak transfer rate highlighted from wikipedia (8x3200=25600) :
Guess that is theoretical anyway.
Btw I think the memory only supports DMP 2.0
r72019
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January 1st, 2021 08:00
Yes, you're running at the rated performance with xmp on.
markburv
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January 1st, 2021 08:00
Ok thanks @r72019 Your first post answers my original question "how to interpret CPU-Z
So just for others, if you want XMP profiles as found in other threads the first solution is to check the bios, mine was disabled and I enabled it.
markburv
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569 Posts
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January 6th, 2021 23:00
Just for additional info, BIOS shows 3200Mhz and AWCC shows nearly 3200:
I have Overclock off in AWCC Home Defaults