X670 memory settings for 64GB

BigBANGtheory

BigBANGtheory

BigBANGtheory

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its not often I ask for help but this one is tearing my hair out...

I have an Asrock X670-E motherboard paired with a 7800X3D and its been doing fine on 32GB (2x16 dual channel) 6000Mhz CL30 etc etc, I've recently bought more memory same make/model/sku to double up to 64GB (4x16) and its giving me real head aches.

To cut a long story short with all 4 memory modules installed I can clear my CMOS setting and get it booting fine at the lazy JEDEC settings which knock it down to 4800MHz and I assume some very slack timings but these memory kits support EXPO profiles and when I select that in the BIOS with AGESA timings, competitive or aggressive (which the previous memory was fine on) I cant boot and have to reset the CMOS again. :mad:

The FSB ratio etc is all on auto...

My use case is PC VR gaming btw, that's where I need the performance.

Is my memory crap?
am I doing something wrong?
am I being unrealistic trying to get 4 x 16GB modules running at the EXPO speeds they are claiming?
does it matter if the memory settings come down and I'm being overly OCD about it?
 
Last edited:
BigBANGtheory said:
am I being unrealistic trying to get 4 x 16GB modules running at the EXPO speeds they are claiming?
Click to expand...

According to AMD's spec, yes. Four single rank sticks is only rated for 3600 (yes, that's DDR5 :o).

Are you using the latest agesa that's supposed to support more memory speeds?

BigBANGtheory said:
does it matter if the memory settings come down and I'm being overly OCD about it?
Click to expand...

The X3D CPUs are less fussy about memory, so I'm far less concerned about it, but it's also true that 4800 is pretty slow.

BigBANGtheory said:
when I select that in the BIOS with AGESA timings, competitive or aggressive (which the previous memory was fine on) I cant boot and have to reset the CMOS again. :mad:
Click to expand...

Keep in mind that EXPO does more than just change the memory frequency and voltage, so if you're not replicating those settings too, it won't be enough.
 
Last edited:
BigBANGtheory said:
its not often I ask for help but this one is tearing my hair out...

I have an Asrock X670-E motherboard paired with a 7800X3D and its been doing fine on 32GB (2x16 dual channel) 6000Mhz CL30 etc etc, I've recently bought more memory same make/model/sku to double up to 64GB (4x16) and its giving me real head aches.

To cut a long story short with all 4 memory modules installed I can clear my CMOS setting and get it booting fine at the lazy JEDEC settings which knock it down to 4800MHz and I assume some very slack timings but these memory kits support EXPO profiles and when I select that in the BIOS with AGESA timings, competitive or aggressive (which the previous memory was fine on) I cant boot and have to reset the CMOS again. :mad:

The FSB ratio etc is all on auto...

My use case is PC VR gaming btw, that's where I need the performance.

Is my memory crap?
am I doing something wrong?
am I being unrealistic trying to get 4 x 16GB modules running at the EXPO speeds they are claiming?
does it matter if the memory settings come down and I'm being overly OCD about it?
Click to expand...

I've heard about this previously, which is why I'm personally going for a 2x32GB setup for the build I have planned.

I think it has something to do with the Memory Controller in the 7000 CPUs, someone on a YouTube comment said this to me a few weeks ago.
 
so yes it seems even at 5200Mhz I'm actually getting above the average


This snippet seems to sum the current situation up:
"2-1R: 5200MT (2 single rank DIMMs) 2-2R: 5200MT (2 dual rank DIMMs)
4-1R :3600MT (4 single rank DIMMs) 4-2R: 3600MT (4 dual rank DIMMs)"

**** I'm gonna have to change my memory to 2 x 32 aren't I that does indeed seem to be the case... Why even bother putting 4 dimm slots on AM5 grrr

Anyway thanks for all the info I seem to have arrived at the answer, I'll be sending Corsair their memory back and selling a 32GB kit shortly
 
BigBANGtheory said:
so yes it seems even at 5200Mhz I'm actually getting above the average


This snippet seems to sum the current situation up:
"2-1R: 5200MT (2 single rank DIMMs) 2-2R: 5200MT (2 dual rank DIMMs)
4-1R :3600MT (4 single rank DIMMs) 4-2R: 3600MT (4 dual rank DIMMs)"

**** I'm gonna have to change my memory to 2 x 32 aren't I that does indeed seem to be the case... Why even bother putting 4 dimm slots on AM5 grrr

Anyway thanks for all the info I seem to have arrived at the answer, I'll be sending Corsair their memory back and selling a 32GB kit shortly
Click to expand...

They might improve things with more BIOS updates in the future. That last one they did gave RAM improvements I think.
 
Why even bother putting 4 dimm slots on AM5 grrr
Click to expand...
Some people won't buy a 2 DIMM motherboard even if it's better because they want the option of adding more RAM later on even if just replacing it would be easier and more compatible.

Most ITX motherboards are 2 DIMM due to space restriction but they also get better memory support (my B550i Strix has really good memory overclocking).

I wanted the an extreme overclocking motherboard for this reason as you get much better memory support with it (can actually do DDR5 8000+ speeds)

I'd happily get a used EVGA Z690 K|ngp|n over a regular brand new Z690 motherboard.
 
I've swapped out my Corsair Vengeance now for G.Skill Trident Z5 Neo and its doing what I want, even getting 6400CL30 on EXPO aggressive timings so I can't argue at that more capacity and faster speeds :)
 
No personal experience, but there is quite lengthy thread on overclock.net about 4 stick configs, looks like some success stories there too
www.overclock.net

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www.overclock.net www.overclock.net
 
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