c5 Code c5 on x870E

[Sui-mohd]

Hello, so I just purchased new DDR5 ram from corsair it’s the dominator titanium

I’ve had two old pairs that are 64 GB

at 6400MT

and currently I just got some newer from that same model only the difference is it’s 48 GB at 6000MT 

I tried all of them. They are all working just by themselves.

But when I tried to install all four of them a code that’s labeled C5 shows up and the computer never posts I changed the clock speed in the bios two 6000 MHz

And I turned off AI over Clock tuner and sent it to manual yet it never worked

I haven’t tried one stick at a time they are all working in the second slot but when I tried them in the first slot, which is A1 

The code C5 still shows up even cleared cmos,

and i updated the bios to the beta version 2102 

My rig is 

Asus rog crosshair x870E hero

ryzen 7 9800x3d 

aorus ice 5090

64gb 6400 corsair dominator 

48gb 6000 corsair dominator 

[Sui-mohd]

My rig*

[RONOTHAN##]

10 minutes ago, Sui-mohd said:

I’ve had two old pairs that are 64 GB

at 6400MT

and currently I just got some newer from that same model only the difference is it’s 48 GB at 6000MT 

That's not the same ram then, it's completely different. 

 

Mixed RAM with DDR5 is infamous for being very difficult to get working, if it even boots in the first place. C5 is the error code for the system failing to train RAM, and I'd be kinda surprised if it worked. 6000MT/s is out of the question, 3600MT/s is about your best hope, and even that's unlikely. 

 

What do you need this much RAM for anyway? You're probably best off returning the new kit, selling your old kit, and buying a 2x64GB kit if you really need that capacity. 

[Sui-mohd]

What’s weird is that if I only plug one stick of ram in the first slot it shows the same code 

second i’m using a lot of 3D modeling and I use AI a lot and also some gaming so when I searched for the same model that I have, it is out of stock and I mean it globally I tried searching everywhere and I couldn’t find it

So I tried the second best thing which is these rams

[RONOTHAN##]

7 minutes ago, Sui-mohd said:

What’s weird is that if I only plug one stick of ram in the first slot it shows the same code 

That's also common, it's with how the memory traces are routed, a single stick in slots 1 or 3 has very bad signal integrity and can cause the system to not boot or be stuck at a really low frequency. 

[Sui-mohd]

Just tried to lower the speed to 3000 and no luck

[Sui-mohd]

Is it the fact that the speeds are different or the storage?

[RONOTHAN##]

19 minutes ago, Sui-mohd said:

Is it the fact that the speeds are different or the storage?

More complicated than just this, but the storage is the closest thing there. 

[BillBill]

2 hours ago, Sui-mohd said:

Hello, so I just purchased new DDR5 ram from corsair it’s the dominator titanium

I’ve had two old pairs that are 64 GB

at 6400MT

and currently I just got some newer from that same model only the difference is it’s 48 GB at 6000MT 

I tried all of them. They are all working just by themselves.

But when I tried to install all four of them a code that’s labeled C5 shows up and the computer never posts I changed the clock speed in the bios two 6000 MHz

And I turned off AI over Clock tuner and sent it to manual yet it never worked

I haven’t tried one stick at a time they are all working in the second slot but when I tried them in the first slot, which is A1 

The code C5 still shows up even cleared cmos,

and i updated the bios to the beta version 2102 

My rig is 

Asus rog crosshair x870E hero

ryzen 7 9800x3d 

aorus ice 5090

64gb 6400 corsair dominator 

48gb 6000 corsair dominator 

There are 3 different issues. Using 4 sticks of RAM with an AMD CPU. AMD doesn't seem to work well with 4 sticks. Even though some older versions of a BIOS might work. Second you have two kits that have different speeds. Mixing 6400Hz and 6000Hz forces all of the RAM to run at 6000Hz. Third you are trying to run on an odd amount of RAM 64GB and 48GB. That makes 112GB. Not all motherboards can support odd numbers. So either use the 64GB kit or the 48GB kit. But not both. Just two matching sticks. Slots A2 and B2. 

[Sui-mohd]

thankfully i figured it out 

i installed the 48gb turned docp on just to match the CL to the 64gb which is 32 

and after memory training i installed the 64gb rams and now they are working at 3600mhz 

i checked occt to see if there is any issue and it worked perfectly fine