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AMD Zen 5 rumours

Legion said:
With Zen 4 and 5 most of the problems start when you try to run 64gb+ kits. You can get CPU's with a real stinker Mem controller that just wont post with 64gb kits (and higher) or will actually post but won't accept EXPO / XMP profiles leaving you with JEDEC speed and timings.
64gb kits (and higher) are dual rank dimms, which further stress the memory controller and in the case of Zen 4 and 5 it's not great to start with.
48gb kits with Hynix M die IC's are generally safe as they are the highest capacity on single rank dimms.
Anyone buying new should check the Mem kits they are looking at have Hynix M or A die IC's for the least issues of compatibilty.
Click to expand...

Thank you
 
Legion said:
With Zen 4 and 5 most of the problems start when you try to run 64gb+ kits. You can get CPU's with a real stinker Mem controller that just wont post with 64gb kits (and higher) or will actually post but won't accept EXPO / XMP profiles leaving you with JEDEC speed and timings.
64gb kits (and higher) are dual rank dimms, which further stress the memory controller and in the case of Zen 4 and 5 it's not great to start with.
48gb kits with Hynix M die IC's are generally safe as they are the highest capacity on single rank dimms.
Anyone buying new should check the Mem kits they are looking at have Hynix M or A die IC's for the least issues of compatibilty.
Click to expand...

Never had much of an issue with memory TBH.
 
Legion said:

TEAMGROUP T-Create Expert Overclocking 10L DDR5 48GB Kit (2 x 24GB) 6400MHz (PC5-51200) CL32 M-DIE Desktop Memory Module Ram Black - CTCED548G6400HC32ADC01​

Have a google around for that, yes it's 6400. But all you'd have to do is once you turn on EXPO / XMP in bios is drop the speed from 6400 to 6000 before you restart the PC for the profile to to kick in.
I've used a few sets of these sets for new builds in the last 6 months and they have never failed to boot on either AMD or Intel.
Top quality Hynix M die IC's.
Once you get familiar with AMD memory tuning you can try and set them back up to 6400 1:1 and from what I've seen so far there aren't many 9000 CPU's that fail 6400 1:1

Should be safe with 48gb M die kits as they are all single rank.
Click to expand...

Damn, I saw this too late, I have ordered a 48GB (2 x 24GB) Corsair kit instead @C30 30-36-36-76, it is despatched and arrives tomorrow. I was thinking maybe trying to drop the capacity down. Should I refuse delivery and go for the teamgroup kit instead?
Legion said:
With Zen 4 and 5 most of the problems start when you try to run 64gb+ kits. You can get CPU's with a real stinker Mem controller that just wont post with 64gb kits (and higher) or will actually post but won't accept EXPO / XMP profiles leaving you with JEDEC speed and timings.
64gb kits (and higher) are dual rank dimms, which further stress the memory controller and in the case of Zen 4 and 5 it's not great to start with.
Now after saying all that Zen 5 does have better success rates at running 64gb than Zen 4 did.
48gb kits with Hynix M die IC's are generally safe as they are the highest capacity on single rank dimms.

The best discussion of Zen 5 and DDR 5 is here: https://www.overclock.net/threads/o...0x-9950x.1811777/?nested_view=1&sortby=oldest

Now as we know, most people just want something that works these days and not have to faff with it. Buying kits with Hynix M and A die IC's will give you the best chances of having that every time.
Click to expand...
Thanks for that link, I will start having a read through..
 
edgedemon said:
Damn, I saw this too late, I have ordered a 48GB (2 x 24GB) Corsair kit instead @C30 30-36-36-76, it is despatched and arrives tomorrow. I was thinking maybe trying to drop the capacity down. Should I refuse delivery and go for the teamgroup kit instead?
Click to expand...
Try the corsair kit and see how it goes.
 
edgedemon said:
It would appear that the Strix X870-I doesn't like my RAM :(
I was (I thought) quite conservative with my choice as I went Trident Z5 neo @6000 with decent SK Hynix F5-6000J3040G32GX2-TZ5N
I'm just getting a solid yellow LED on boot and then after about 20 secs the machine powers off.

looking through the QVL - there isn't a single 2 x 32GB kit listed, I might have to re-order for 48GB instead. Thank god for distance selling rules.
Click to expand...
Have you updated the bios. Might be worth trying one stick to see if that works.
 
Grim5 said:
Less than half of x870e boards can do the new 8000mt/s RAM speed that's a supposed feature of x870e

Click to expand...

Yes and you all know Prime 95 is the best way to test RAM :D

0So6Apw.jpg
 
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eeii said:
Have you updated the bios. Might be worth trying one stick to see if that works.
Click to expand...
Yep, BIOS flashed to AGESA PI 1.2.0.2 and each stick individually tried on both slots.
Yellow LED fires up instantly when I turn the machine on.
If I remove both sticks the LED will be on until I push one of them back in.
I have a 48GB kit arriving today, hopefully that will fix the issue.
Is it normal with RAM errors that the machine turns itself off after a period of time?
It will turn on and display the LED status light and then turn off after about 45 secs. I have to remove the power before I can turn the machine back on.
 
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cliffy said:
ANyone any suggestions on if i can get more out of this. Running 4 Dimms of the below memory at 6400M/s CL32 on a Gigabyte X670E Pro X with a 9950X, IF at 2133Mhz, SOC voltage 1.25 everything default

G.Skill Royal RGB XMP 32GB 2x(2x16GB) DDR5 PC5-51200C32 6400MHz Dual Channel Kit - Silver

AXitmyB.png


Also whats with the error message in teh screenshot, can someone tell me how to get rif of that?

Thankls for the help
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4 Dimms @CL32 and 6400? Aren't you doing well to get that?
 
Prime95 Large FFT’s are fine for mem testing. He should state the preset he used. You can also custom range fft’s but large is fine. It’s very similar to Occt/large.

Personally the best test right now is ycruncher. 8b for quick validation when making changes and VST for extended stability testing.

Another consideration when you see techtubers testing high end xmp; As xmp goes up, key timings like trrd and tfaw get loosened up which makes it a lot easier to pass stability tests.
 
edgedemon said:
4 Dimms @CL32 and 6400? Aren't you doing well to get that?
Click to expand...
I was surprised to say the least. I have to run some stability tests but it has been stable while encoding, gaming and through some cinebench runs

Dump tow of the DIMM's, or replace all 4 with larger capacity ones if you want the same total amount of RAM, four DIMM's is a bad choice in the DDR5 world if you want speed and timings.
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To be honest i like the look of 4 DIMMS and was surprised to get those speeds
 
Do you think it's worth getting 8000 speed memory with an X870 board, I know it's still hit and miss but do you think this will improve with bios updates

Or is it just better to stick with a lower speed of memory
 
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