Question Dual channel DDR4 low freq or not working at all

Dec 29, 2020
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Currently I have a Ryzen 2700x on a X470 AORUS ULTRA GAMING (rev 1.0)with 16 RAM 3200 C16 (Patriot Memory Viper RGB 16GB DDR4 3200MHz (16 GB, 2 x 8 GB, DDR4, 3200 MHz, 288-pin DIMM)) and a Gigabyte 2080ti.

Since new Motherboard update supports new Ryzen 5000 I decided to buy a 5600x and a couple of DDR4 8 Gb 3600 C14 (G.Skill Trident Z Neo F4-3600C14D-16GTZNB).

Ram arrived first so I decided to test it.

First thing I noticed is for some reason my actual RAM was in Single channel, so I decided to put new one in DUAL channel. I got like 2 fast reboots and then PC starts but in CPU-Z I got Freq 1066 and 15:15:15 which is not my DDR specs. I tried to go bios select XMP and save, same result 2 fast reboots same in CPU-Z.

So I put them in Single Channel, everything's fine. Freq 1799 14:15:15

Since I still have my old DDR 3200 I decided to test them in the same way.

Single Channel: Freq 1598 16:18:18, all good.
Dual Chnnel: Windows starts butafter some seconds I get a blue screen giving random errors about memory acces.

So at this point I'm a bit lost, my best guess is my Mobo is faulty and can't handle DUAL channel properly, but not really sure.

Any help or advice would be much appreciated.
 

thx1138v2

Distinguished
CPU-Z reports the actual clock speed. Your DRAM is Double Data Rate (DDR) which means it performs transfers on both the rising and falling edges of clock signal. So your transfer speed is twice as fast as CPU-Z reports, i.e. 1066=~2132, 1598=~3200, and 1799=~3600.

Both the 3200 and 3600 speeds are considered overclocking per the following link. The DRAM speed and the ability to overclock it depends on 3 things: the CPU (it contains the RAM controller), the motherboard, and, of course, the DRAM modules. So the CPU will also affect the speed you can achieve.
https://www.gigabyte.com/Motherboard/X470-AORUS-ULTRA-GAMING-rev-10/sp#sp

In Single Channel mode the data bus between the CPU and the DRAM module(s) is 64 bits wide. In Dual Channel mode the data bus appears to the system to be 128 bits wide. So the system can transfer twice as much data in the same amount of time. This doesn't have anything to do with the actual clock speed.

I doubt that anything is faulty. Just wait for the new CPU and test again.
 
Dec 29, 2020
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Hi, as you said mounting new CPU solved everything. With 5600X I have my RAM 3600 in DUAL channel and everything is working perfect.

Thank you very much !
 

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