4 memory strips (6400 MHz) for MAG X670E TOMAHAWK WIFI

zarattu15df02e5

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I bought 2 additional ADATA XPG Lancer Blade RGB [AX5U6400C3216G-DTLABRWH] 32 GB memory strips to my already installed Kingston FURY Renegade Silver RGB [KF564C32RSAK2-32] 32 GB. The modules are similar in characteristics, but! One memory has an HMP profile, the other EXPO. Otherwise, they are identical. Separately, they work properly and at the declared frequencies. Together, they do not start at 6400. Maybe you need to set special parameters manually? I tried to remove the automatic profile detection, and set 6400. The motherboard did not start. The red and yellow LEDs were on. Will I be able to start them at the specified frequency of 6400, or is it better to give the store new memory (ADATA) and replace it?
P.S. The BIOS is the latest. CPU - 7800X3D
 
Four modules are not ideal in general, see RAM explained: Why two modules are better than four / single- vs. dual-rank / stability testing

As you can see in this video from Linus Tech Tips for example, on an X670E Carbon Wifi with a 7950X3D, the 4x 16 GB refusing to run at EXPO speeds is the one thing that did not work properly on that PC. In this follow-up video, he states again that this was the only mistake that was made, not using 2x 32 GB when you want 64 GB total. And this is totally correct, especially for AM5.

Any total RAM capacity you want, with DDR5, try to reach it with two modules only. First i'd make sure you actually need that much RAM for your workloads, this would only be required for professional workloads. For daily use including gaming, you'd have more than enough RAM if you only use 2x 16 GB in slots A2 and B2, which is the optimal configuration for most people with DDR5. If you do need the full 64 GB, then it's much better to use a kit of 2x 32 GB instead of combining two kits of two to have four modules. Four modules makes everything worse.

Then, another mistake is to use two different models of RAM kits. Even though they might have similar specs, those modules are likely completely different, using different memory ICs (memory chips) for example, this throws off the memory system.. It can pose a considerable challenge for the parameters on the memory bus, which then have to be a compromise, because there can only be one set of parameters for all the installed RAM at once. Sometimes there is no good compromise.

The best way for any modern motherboard is to use a RAM kit of two identical modules, this is equivalent to a racing bike. The second best way is to use four identical modules, this is the equivalent to a van, you should only use it when you can't reach the desired total RAM capacity with two modules. And there you should use a kit of four matched modules, with an EXPO profile if possible.

Of course then the speed might not be this high, but you have to realize, once you simply add two kits of two together, their XMP/EXPO profile goes out the window, since it was only meant for those two modules of one kit, each on their own. When you use four modules, the stress on the memory system doubles, and the electrically it becomes worse. This makes it considerably harder, sometimes impossible, to reach the same speed as with two modules. So it's always best to use a kit of two identical modules only, the second best thing (in a distant second) is to use four identical modules. Four mismatched modules is just asking for trouble.
 
Four modules are not ideal in general, see RAM explained: Why two modules are better than four / single- vs. dual-rank / stability testing

As you can see in this video from Linus Tech Tips for example, on an X670E Carbon Wifi with a 7950X3D, the 4x 16 GB refusing to run at EXPO speeds is the one thing that did not work properly on that PC. In this follow-up video, he states again that this was the only mistake that was made, not using 2x 32 GB when you want 64 GB total. And this is totally correct, especially for AM5.

Any total RAM capacity you want, with DDR5, try to reach it with two modules only. First i'd make sure you actually need that much RAM for your workloads, this would only be required for professional workloads. For daily use including gaming, you'd have more than enough RAM if you only use 2x 16 GB in slots A2 and B2, which is the optimal configuration for most people with DDR5. If you do need the full 64 GB, then it's much better to use a kit of 2x 32 GB instead of combining two kits of two to have four modules. Four modules makes everything worse.

Then, another mistake is to use two different models of RAM kits. Even though they might have similar specs, those modules are likely completely different, using different memory ICs (memory chips) for example, this throws off the memory system.. It can pose a considerable challenge for the parameters on the memory bus, which then have to be a compromise, because there can only be one set of parameters for all the installed RAM at once. Sometimes there is no good compromise.

The best way for any modern motherboard is to use a RAM kit of two identical modules, this is equivalent to a racing bike. The second best way is to use four identical modules, this is the equivalent to a van, you should only use it when you can't reach the desired total RAM capacity with two modules. And there you should use a kit of four matched modules, with an EXPO profile if possible.

Of course then the speed might not be this high, but you have to realize, once you simply add two kits of two together, their XMP/EXPO profile goes out the window, since it was only meant for those two modules of one kit, each on their own. When you use four modules, the stress on the memory system doubles, and the electrically it becomes worse. This makes it considerably harder, sometimes impossible, to reach the same speed as with two modules. So it's always best to use a kit of two identical modules only, the second best thing (in a distant second) is to use four identical modules. Four mismatched modules is just asking for trouble.
Made several more attempts to run with manual settings - unsuccessfully =( Returned the memory to the store. Ordered 2*32=64 (6400). I hope this will close all the questions.
P.S. I fly to MSFS 2024 in VR. Sometimes the system runs into 32 GB of memory, especially if a browser and several auxiliary programs are running in the background.
 
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