Msi B550m mortar ram support.

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Hi guys, a few weeks ago I changed my ram from 32gig(4x8) gskill 3600 cl15 to 32gig(4x8) gskill 4000 cl15 Royals and they were running great on my Msi x570 Unify but I had to make a slight downgrade on my motherboard due to the x570 not fitting in my Lian li mini snow edition case, any way I looked at getting an x570 micro itx from Asus and Gigabyte but but I like having Mystic light software so decided to go with a b550m mortar with 4 dim slots, unfortunately this particular board does not support 4 dims @4000 only 2 dims, while 16gig @4000cl15 is more than enough... I spent a lot of money on 4 sticks of rgb bling only to have 16gig still sitting in its box, the b550m supports 4 sticks of 3600cl15 which isn't that much slower so I`m wondering if anyone has been able to force 4 sticks of ddr4 4000 to work on there b550m with out black screen or boot issues.
 

citay

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The G.Skill Trident Z Royal DDR4-4000 CL15-16-16-36 have a very demanding XMP profile, which is made even more obvious by the 1.5V XMP voltage. This kind of kit is not easy to run at XMP, neither on AMD nor on Intel, and especially not if you double the stress on the memory system by using four modules. It's very rare for high-spec XMP RAM to be available in kits of four, most of the time they come in kits of two modules only. This is not without a reason, maybe you know my thread: RAM explained: Why two modules are better than four / single- vs. dual-rank / stability testing

On both platforms, you will have to make some compromises. XMP is a goal that can be reached in optimal conditions, but if one of the factors in the memory system is not perfect, it won't work.
There are likely two sticking points: The Infinity Fabric running at 2000 MHz will probably require some of the related voltages to be raised. But even then, running the XMP profile as is would be very difficult. First of all, try with Gear Down Mode enabled and set tCL to 16, i think GDM doesn't allow uneven values there.

Then please make a screenshot of the Auto voltages in the "Overclocking" section in the BIOS, after enabling XMP, enabling GDM with tCL 16, rebooting, and entering the BIOS again.
If memory training fails with that configuration, set DDR4-3600 DRAM Frequency (still with XMP enabled) on top of the rest, and then screenshot the voltages.
To do that, press F12 in the BIOS for a BMP screenshot to a FAT32 drive, then convert to PNG to reduce the size and then you can upload it here.

Also make sure you have the newest BIOS update installed (yes, the beta, if that's the newest one).
 
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Hi, thanks for the info, had no issues running all 4 sticks on my x570 Unify but Im currently running all 4 sticks on my b550m @1066 with jedec 7 timings 16 15 15 36 50 1.2v and Im begining to think clock speed is irrelevant and overrated because after spending over 2hrs playing the division 2 I see no lack of performance... if anything game play is smoother.
 

citay

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If RAM clock speed was irrelevant, we'd still be using DDR-400 CL3-3-3-8. No, RAM speed (and thus bandwidth) is important. You can make big gains in performance especially in games if you extract the most from your RAM. Most likely there were some other factors involved in your old system not being as smooth, despite being more high-end, plus, the human perception can be very weird. If you don't have hard numbers to back up your feeling, like FPS and 1% low etc., then you can't fully trust it, especially since you are not testing back-to-back.

Try the settings i mentioned above. You can even run some gaming benchmarks before and after. It should become very clear that running it at DDR4-3600 is advantageous over the safe JEDEC speed.
 
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If RAM clock speed was irrelevant, we'd still be using DDR-400 CL3-3-3-8. No, RAM speed (and thus bandwidth) is important. You can make big gains in performance especially in games if you extract the most from your RAM. Most likely there were some other factors involved in your old system not being as smooth, despite being more high-end, plus, the human perception can be very weird. If you don't have hard numbers to back up your feeling, like FPS and 1% low etc., then you can't fully trust it, especially since you are not testing back-to-back.

Try the settings i mentioned above. You can even run some gaming benchmarks before and after. It should become very clear that running it at DDR4-3600 is advantageous over the safe JEDEC speed.
hI, I`ve just tested 3600 14 14 14 34 and... 1066 was smoother, 3600 gave micro judders and thats at 1.47v
 

citay

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1066 will be DDR4-2133 then, let's not mix non-DDR and DDR speeds. So DDR4-3600 should have considerably higher fps, but causes micro-judder. But is it the cause of the micro-judder? It can only be indirectly. Otherwise, all gamers would complain about it and the trend would be to use really slow RAM (or deliberately use a slow RAM profile and not use XMP). But what is the actual trend? To use as high RAM speed as possible (while still staying in sync with the memory controller). So clearly there is something else going on there which is causing the judder.

You need to really compare the two states, with JEDEC and with XMP. Apart from the RAM timings, look at all the other BIOS settings that have changed automatically. You have to get to the bottom of this. The alternative would be to keep your RAM at slow JEDEC speed, meaning you paid 4x too much for your expensive RAM, as there's 4x 8GB kits starting from a little over 100 EUR/USD. But DDR4-2133 is truly a bottleneck, you can run almost any gaming benchmark.
 
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