cancel
Showing results for 
Search instead for 
Did you mean: 

Z690 and using two 2x16GB DDR5 kits

NE0XY
Level 9
Might be a dumb question but I'm wondering if it's possible to combine two kits of 2x16GB ddr5 modules of the same model. And using XMP2. I'm assuming no but wanted doublecheck anyway.
I've found myself often using 80-95% of my available 32GB kit. And that's not even with my usual amount of chrome tabs open lol so would be nice with more stick but can't find any 4x16GB kits.

Thanks
692 Views
18 REPLIES 18

Better to just wait till a 4 pack comes out

MartinSugar wrote:
Better to just wait till a 4 pack comes out



True, I assume the compatibility list will be updated then

I said screw it and returned the second 2x16 vengeance kit. 32gb is enough for now.
I'll just wait until faster, larger, lower CAS latency kits come out.

NE0XY wrote:


Hopefully there will be some 4x16 kits available soon then because I quite often end up using 80-95% of my 32GB kit.


I think you would be better off selling your 2 x 16 GB kit, and go for a 2 x 32 GB kit (as soon as they are "reasonably" available.

Chainbold wrote:
I think you would be better off selling your 2 x 16 GB kit, and go for a 2 x 32 GB kit (as soon as they are "reasonably" available.


Yeah I will return both kits, only had them for one day so will get a full refund. I have some cheaper "bare" ddr5 that I used while I tried to get these ones that I will use in the meantime.
Would prefer 4x16 over 2x32, hopefully won't take long.

Still waiting for Thor 2 1200W as well...

NE0XY wrote:
Yeah I will return both kits, only had them for one day so will get a full refund. I have some cheaper "bare" ddr5 that I used while I tried to get these ones that I will use in the meantime.
Would prefer 4x16 over 2x32, hopefully won't take long.

Still waiting for Thor 2 1200W as well...


I just added a second (2x16) 5200mhz Vengeance kit and it WON'T run stable @ 5200mhz when running all 4 matching Dimms.
I had to back the XMP off to 4800mhz to get it stable.

Sure hope they fix this soon. Asus Z690 launch seems terrible, so many issues from WHEA Logger errors not detecting SN850 SSD's, Ram problems, Backwards Caps starting fire, could the Launch be worse?

rjbarker
Level 11
I would never recommend combining kits.
Better of to pick up 2*32G kit when its available.

It may or may not work when enabling XMP profiles.

Silent_Scone
Super Moderator
It's difficult not to sound like a broken record, but Please don't combine memory kits and ask why XMP will not work.

This is a historical issue enthusiast face that will probably continue. However, the introduction of DDR5 has brought in far more unsuspecting users seeking answers.

The main culprit is the lack of 4 DIMM kits currently on the market for DDR5. Most users where possible do tend to buy kits at the rated density, timings, and frequency. However, if you remove those kits from the market you leave a gaping void to be filled with users looking for 64GB and/or simply to populate all available memory slots.


The reason you should avoid combining kits is actually painfully simple, however, the whys and buts are best left to actual DRAM and electrical engineers.



The memory kit is binned by the vendor to operate at XMP in the exact density it is sold in. If you combine them, you will need to consider the following things, and there will be only so much guidance others can give you.

1). Evaluate if the kit is able to run at or even close to the rated frequency anymore. This depends on the amount of guardband the memory vendor has put in, the motherboard, platform and CPU. *

2). Evaluate if the kit is able to run at or close to the primary timings the memory vendor has put in. This also depends on the amount of guardband the memory vendor has put in.

3). Evaluate how much voltage the memory needs for the above two points.

4). Evaluate the motherboard sub timings to see if the kits are able to run at or close to the auto ruling assigned by the board vendor.

5). As with any memory kit, evaluate what voltages are needed on the CPU side. (MCVDD / CPU SA).


Best of luck
13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

NE0XY
Level 9
So looking at the compatibility list for the motherboard (Maximus Extreme Glacial) it seems that the only 64GB kit available is the Corsair Dominator Platinums