Can’t boot with new ram

[Curtis vincent]

I have an aorus z690 xtreme board with a 12900k. I recently bought 2 kits of gskill trident z5 2x32gb 6400mhz cl32 ram and I can’t get it to boot on anything higher than 4800mhz (which I know is what intel says is the max 12th gen supports) I’m planning on upgrading cpu but for now at least I would like to be able to get closer. I’ve looked a load of stuff online and it’s kind of beyond me but I would appreciate any assistance. XMP straight up does not work

 

[Curtis vincent]

Have you updated the motherboard bios as there have been several memory compatability fixes since launch?

Yeah am on the latest revision. Still no luck

 

[Curtis vincent]

Z690 and 12th gen don’t have the best memory support.

Can you run the RAM at 6000 CL40?

What does the motherboard say on the memory QVL list?

Not tried 6000 at cl40. Was just able to get 5600 stable at cl36 though.

 

[Curtis vincent]

Yes I only just realised that OP is trying to run a million gigabytes - this is exactly why it’s not stable at high speeds / low latency.

OP try running half of that RAM at 6000 CL 32 as tamzzy.

I bought 128gb for a reason. If I have to just run it a bit slower then that’s fine. But I’ve seen people on YouTube get 4 sticks of 32gb running at 6400mhz

 

[Curtis vincent]

2 stricks should run fine at 5600mhz if on intel but as others have said to run 4 sticks past 5200mhz speed will be a very tall task indeed, even then you'll need to loosen the timings to get all 4 to work and at a lower overall speed, tbh if your cpu's imc is poor 5200mhz with all 4 sticks may not even work.

thats why the enterprise sector exists, if you run more memory 64gb or highter, you need a sever class chip that can handle loads of ram, but again speed isnt the big draw, most kits in that area run around 3200mhz for ddr4 and 4800-5200mhz for ddr5, only really high end setups can take advantage of speed and capacity.

just checked the product page for the 12900k and it does indeed support upto 128gb of ram but just below under memory types ddr5 speed is 4800mhz and ddr4 is 3200mhz, ideally max ram channels is 2 not 4, with peak bandwith of 76.8gbps.

I had occasional crashes when I manually put the values in, and got it to 5600mhz cl36. Gonna dial it back g bit by bit till I’m happy. Do you reckon I will have much more headroom when upgrading to 14th gen?

 

[Curtis vincent]

Well yes, but that’s not all hardware and those people are probably RAM overclocking experts like Buildzoid.

You need very good hardware to do those sorts of speeds and timings - RAM overclocking focused motherboards and binned CPUs to fined the best memory controller possible.

Just run your RAM at slower speeds and be happy

It's just a learning curve, I'll tweak and see what the best I can get is, but at least I know now what's realistic. Hopefully 14th gen will lift that ceiling a bit.

 

[Curtis vincent]

memory speeds and timings are directly affected by the quality of the cpu, the IMC is built into the cpu and it's very difficult to know beforehand if a certain batch is good or bad, from what i have seen 14th gen is just a spped boost and core changes from 12-13th gen, memory speed on 14th gen has improved but offical support is 6000mhz ddr5.

12900k offical ddr5 support is 4800mhz dual channel
13900k official ddr5 support is 5600mhz dual channel
14900k official ddr5 support is 6000mhz dual channel

End of the day its a coin flip you could buy one and its amazing supporthing all 4 sticks at 6000mhz+, the other hand maybe the complete oposite. cl36 with 128gb of ram is really going some, you want to drop back to cl40 for stability.

Will see how it goes when I upgrade. Question though. is it just about how many dims or how much capacity or both? My options were this or 2 sticks of 48gb at same speed. I don't necessarily need 128gb, but could really do with more than 64gb.

 

[Curtis vincent]

i was going to say have a look at the 96gb kits but they seem to be amd optimised, which could lead to problems on intel, you'd have to manually input all the timings and voltages as xmp wouldn't work right.

its a double edge sword capacity and how many dimms directly affect what you can use on mainstream kit, when you go above 64gb either in dual or quad channel arrangments, it can be tricky to get working or run at decent speeds, you could have a look at the newer 96gb kits but again you may find it difficult to get working and be fully stable.

Yeah I guess for now I'll just run at whatever is stable and then reassess once I have 14th gen.

 

[Curtis vincent]

I think Level1Techs did a video a while back about using large amounts of RAM.

Oh nice, I'll have a look later.

 

[Curtis vincent]

14th gen now listed on OCUK, 14900k has this listed in the specs
- Up to 192GB DDR5-5600 memory

Gibbo also said its basically just 13th gen with much better memory support