X670 memory settings for 64GB

BigBANGtheory

BigBANGtheory

BigBANGtheory

Soldato
Joined
21 Apr 2007
Posts
2,545
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?
 
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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
 
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 :)
 
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