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Question Memory refuses to do 1T on X570/3900x - but does it matter?

viivo

Diamond Member
May 4, 2002
3,320
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91
ASUS TUF X570
The memory is 2x8GB of Patriot Viper 4400 C19 @ 3600 15-15-15-39 1.36v. Auto Command Rate defaults to 2T, and if I set it to 1T it fails to POST despite voltage increases and hilarious loosening of timings (18-18-18-600trfc @ 1.45v can't do 1T.)

Is there setting or subtiming that directly affects CR? Is it even necessary to run it at 1T?
 

Martimus

Diamond Member
Apr 24, 2007
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Doesn't the infinity fabric need to run at 2200MHz to get a 1T timing on 4400 RAM? It has been a while since I've dealt with higher speed RAM though, so I'm probably wrong.

However I did hear that it is important to have a 1 to 1 ratio on Ryzen, or you have some pretty heavy performance drops. The more recent chips seem to be able to get 1800-1900 on the infinity fabric from what I hear, leaving you can run it at 3600-3800 pretty easily.

If I find the source where I heard that, I'll post it so you can determine if it applies to your setup. This is mostly third hand knowledge, where I was interested in the subject, but I don't have great memory so I'm not real confident I remember correctly. I just wanted to reply since no one else had given you an answer.

Edit: I think this is at least part of what I was looking for

I apologize I am not more knowledgable about this.
 
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viivo

Diamond Member
May 4, 2002
3,320
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91
Doesn't the infinity fabric need to run at 2200MHz to get a 1T timing on 4400 RAM? It has been a while since I've dealt with higher speed RAM though, so I'm probably wrong.
I'm running the memory at 3600 with 1800 FCLK for 1:1. I mentioned the default XMP setting of 4400 just in case the information would be helpful with troubleshooting.
 

Makaveli

Diamond Member
Feb 8, 2002
4,067
132
106
ASUS TUF X570
The memory is 2x8GB of Patriot Viper 4400 C19 @ 3600 15-15-15-39 1.36v. Auto Command Rate defaults to 2T, and if I set it to 1T it fails to POST despite voltage increases and hilarious loosening of timings (18-18-18-600trfc @ 1.45v can't do 1T.)

Is there setting or subtiming that directly affects CR? Is it even necessary to run it at 1T?
Is that this kit?

 

thor23

Member
Jul 13, 2019
77
20
41
ASUS TUF X570
The memory is 2x8GB of Patriot Viper 4400 C19 @ 3600 15-15-15-39 1.36v. Auto Command Rate defaults to 2T, and if I set it to 1T it fails to POST despite voltage increases and hilarious loosening of timings (18-18-18-600trfc @ 1.45v can't do 1T.)

Is there setting or subtiming that directly affects CR? Is it even necessary to run it at 1T?
Playing with the cad bus drive strengths can apparently help with this. Auto is 24-24-24-24 so maybe try 40-20-24-24.
 

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