[SOLVED] Understanding Infinity fabric frequency and dividers

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thisisarnab.me

thisisarnab.me

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Dec 2, 2018
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So finally I've made my rig consisting of Ryzen 5 3500, Rtx 2060, B450 steel legend and Adata xpg gammix D30 3200 mhz16gb. Getting into the bios I can see that there is an memory overclock section with XMP profile. I understand that XMP profile can let me achieve the targeted 3200 mhz (currently set to 2666 mhz). But there is a option called 'Infinity fabric frequency and dividers', which can manually be set upto 3000 mhz. Does anyone have any idea about what it is? What should I set it to when I set the dram frequency to 3200 mhz? I don't want to oc the cpu right now. Considering this, do I need to change any more profile?

Thanks in advance.
 
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Solution
Karadjgne
Yes. A2 and B2 are the primary gateways, A1 and B1 are the secondary gateways. You'd only use those in the event of using 4 sticks of ram, which by necessity of the infinity fabric will only run at lower speeds than the xmp rating of 2 sticks.

A2 is the most direct link, and used by AMD as the Primary port, the only port for a single, high speed stick.

It's very similar to the usb ports on the back of the pc, there's some high speed 3.2 red slots, some standard 3.0 blue slots and some black USB 2.0 slots. For an external storage, you'd use the red, not black, or you'll have time for a nap between uploads/downloads.

High speed ram needs the 'red' A2-B2 slots. A1-B1 would be black slots.
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Karadjgne said:
I believe that's for manually setting fclock if using ram faster than the 3466 cap on 2000 series cpus, allowing infinity fabric to be set under that cap to retain the 1:1 ratio.
View: https://www.reddit.com/r/Amd/comments/cc1hta/infinity_fabric_dividers_on_zen2/
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Very much informative. Thanks. So I guess being under DDR4-3600 (in my case 3200 mhz) means I don't have to manually adjust it, since the 'FCLK' sets itself automatically to 1600 mhz, or I could set it directly to 1600 mhz whatever! Is there any other setting that I need to change?
 
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CountMike said:
For RAM frequency lower than 3200MHz it may be beneficial to set higher Infinity fabric than 1600 but you would have to experiment a little.
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Even after selecting the XMP profile to 3200 mhz and FCLK to both auto and 1600 mhz, I am still seeing the ram is running at 1330 mhz . I tried tweaking the voltage to 1.4 v from 1.35 and of course 'Saved changes and Exit' It didn't work. Can anyone help me?
 
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Yes. A2 and B2 are the primary gateways, A1 and B1 are the secondary gateways. You'd only use those in the event of using 4 sticks of ram, which by necessity of the infinity fabric will only run at lower speeds than the xmp rating of 2 sticks.

A2 is the most direct link, and used by AMD as the Primary port, the only port for a single, high speed stick.

It's very similar to the usb ports on the back of the pc, there's some high speed 3.2 red slots, some standard 3.0 blue slots and some black USB 2.0 slots. For an external storage, you'd use the red, not black, or you'll have time for a nap between uploads/downloads.

High speed ram needs the 'red' A2-B2 slots. A1-B1 would be black slots.
 
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Solution
Karadjgne said:
Yes. A2 and B2 are the primary gateways, A1 and B1 are the secondary gateways. You'd only use those in the event of using 4 sticks of ram, which by necessity of the infinity fabric will only run at lower speeds than the xmp rating of 2 sticks.

A2 is the most direct link, and used by AMD as the Primary port, the only port for a single, high speed stick.

It's very similar to the usb ports on the back of the pc, there's some high speed 3.2 red slots, some standard 3.0 blue slots and some black USB 2.0 slots. For an external storage, you'd use the red, not black, or you'll have time for a nap between uploads/downloads.

High speed ram needs the 'red' A2-B2 slots. A1-B1 would be black slots.
Click to expand...
Okay, so I am gonna put my ram sticks in a2-b2 and try to overclock? Is there any more settings that need to be changed? Sorry for this infinite stupidity, but I just gotta find help to see my pc in the best shape
 
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Karadjgne said:
Depends on exactly how the pc runs after a successful OC attempt. There's voltages that might be lowered, SoC might need a little bump, etc. Much fine tuning to dialing in a Ryzen OC to stay within its relative safe levels while getting the most out of those same limits.
Click to expand...
All right, it seems the guy assembled this totally forgot to take a look at the manual, yeah it's also recommended in the manual to use the a2b2 slot. I will try to adjust the voltage and let you know the results.
 
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