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Memory Speeds - MSI MPG Z790I EDGE WIFI - Intel® Core™ i9 processor 14900K

H

HBSound

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Jul 16, 2022
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I like the GSkill—F5-6800J3446F48GX2-RS5K Ripjaws S5 DDR5-6800 CL34-46-46-108 1.35V 96GB (2x48GB) Intel XM. The RAM speed is rated at 6800. Throughout my studies, the processor can only handle up to 5600. For the sake of dollars and cents, what does going over in speed do if the processor is going to CAP the speed of the memory? Technically, I am not into RAM overclocking, etc.

I am building an ITX workstation. I am not into playing video games; I use my computer for CAD/3D/BIM/Rendering. So, for the sake of it all, I am chasing more stability than overclocking.

Is there a benefit to installing faster RAM into a motherboard that does not support it? If I opt for the same RAM kit at a speed of 5600, I can save $105.00. I'm trying to determine if getting the fastest RAM sure, but if the CPU knocks the cap of the 6800 RAM off at 5600, is this pointless? Now If faster RAM is better for simplicity's sake, I will invest in the best memory I can afford. However, I believe there may be a point of diminishing returns at some stage.

Thank you

Motherboard Memory Specifications

MEMORY 2x DDR5, Maximum Memory Capacity 128GB
Memory Support 8000+(OC)/ 7800(OC)/ 7600(OC)/ 7400(OC)/ 7200(OC)/ 7000(OC)/ 6800(OC)/ 6600(OC)/ 6400(OC)/ 6200(OC)/ 6000(OC)/ 5800(OC)/ 5600(JEDEC)/ 5400(JEDEC)/ 5200(JEDEC)/ 5000(JEDEC)/ 4800(JEDEC) MHz
Max. overclocking frequency:
• 1DPC 1R Max speed up to 8000+ MHz
• 1DPC 2R Max speed up to 7200+ MHz

Supports Intel® XMP3.0 OC
Supports Dual-Controller Dual-Channel mode
Supports non-ECC, un-buffered memory

Processor Memory Specifications

Max Memory Size (dependent on memory type) 192 GB
Memory Types Up to DDR5 5600 MT/s
Up to DDR4 3200 MT/s
Max # of Memory Channels 2
Max Memory Bandwidth 89.6 GB/s
ECC Memory Supported ‡ Yes
 
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I run 6000 on a 14900ks and it was everything I could do to make it happen on this board. XMP didn’t even work with the profile. I have to manually plug it in and even then it hated booting. I had to push the timings much looser and enable “memory try it” before it would even post on this board.
 
Solaris17 said:
I run 6000 on a 14900ks and it was everything I could do to make it happen on this board. XMP didn’t even work with the profile. I have to manually plug it in and even then it hated booting. I had to push the timings much looser and enable “memory try it” before it would even post on this board.
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thank you.

So are you suggesting keeping it at 5600? I will use the 14900k in this setup.
 
HBSound said:
thank you.

So are you suggesting keeping it at 5600? I will use the 14900k in this setup.
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I would. I spoke about this board in another thread but the conversation was more loosely based on memory controllers. For our density’s it’s almost impossible on 13 and 14th gen. I have tried pushing on a 13900k, 13900ks, 14900ks. Z690 dark, and this z790 edge wifi.

The best I could do on a 64gb kit was 6400 and it wasn’t a set it and forget it.

anything passed 32gb and it’s a roll of the dice. FWIW it’s the same kit as you just slower. No way are you going to hit 96gb 6800 on this board. With 48gb dimms.
 
I thought ITX boards were even better in running high speed memory vs ATX boards.
 
P4-630 said:
I thought ITX boards were even better in running high speed memory vs ATX boards.
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Especially this one. As long as your dimms are 16gb. DDR5 is still weak to the higher capacity lower speed as all previous DDR generations.
 
2x48GB (96GB or dual-rank rank at 6800 is the upper limit of the Intel 13/14th Gen CPU. You might get a really good binned CPU, or you can unlucky and one that can't even boot that speed.
 
The 1DPC ITX board may help (and this is one of the easiest models to work with), but I wouldn't count on it - everyone in the thread summed up nicely. I would stick to traditional 2x 16 GB (single rank) sticks if you absolutely do not need the memory capacity, if you mean to get 96 GB RAM on 2 48 GB sticks, then you are going to be taking a hit there - 5600 to 6000 is on the optimistic range.
 
HBSound said:
Im building an ITX workstation. I am not into playing video games; I use my computer for CAD/3D/BIM/Rendering. So, for the sake of it all, I am chasing more stability than overclocking.
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2x24GB is a nice middle ground too. But if your are doing work related stuff that needs a lot of ram, it's necessary. Go with 96GB at 5600 and call it. Yeah you'll lose a little bit of time in CPU rendering, but what's 30 minutes extra of a 12hr render? Nothing...

13min per frame. Say you have a 3 minute at 24f video. That's 4320 frames or 936 hrs lol. At that point might as well just use the GPU render for 15-30sec a frame for a 36hr render. :)

Btw that benchmark (splash) scene requires over 16GB to render.

1719775668762.png
 
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Dr. Dro said:
The 1DPC ITX board may help (and this is one of the easiest models to work with), but I wouldn't count on it - everyone in the thread summed up nicely. I would stick to traditional 2x 16 GB (single rank) sticks if you absolutely do not need the memory capacity, if you mean to get 96 GB RAM on 2 48 GB sticks, then you are going to be taking a hit there - 5600 to 6000 is on the optimistic range.
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I have decided to buy two 48GB memory modules and stick with the 5600 model. I want to make sure I don't run into any performance issues related to memory speed.
 
Just in case If you decide to go with 4x48GB, you will have to run at 4800 or possibly lower. 4x dual-rank is really hard on the CPU memory controller.
 
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