Question Dual Channel problems on ASRock Fatal1ty Z97 Killer motherboard ?

[1Speedy9]

Hi.

After I updated the CPU to an i7-4790, the motherboard will not accept Dual Channel. It beeps.

It previously ran fine with 2 x CMD32GX3M4A2400C10 and will still run with the two modules, just not in dual channel. I got hold of two other modules CMD16GX3M2A2400C10. I thought that then I could at least get more RAM, without them being in dual, but they are too similar.

I have tried different ways, but nothing works. Does anyone have a suggestion for what is wrong?

 

[Lutfij]

Welcome to the forums, newcomer!

Did you make sure your BIOS for the motherboard was updated to the latest? As for the processor upgrade, what were you on prior? With the new processor, check to see if the socket has any bent or broken pins.

Got hold of two other modules CMD16GX3M2A2400C10
If you can, please pass on images of the PCB number on the ram kits. Corsair is the only brand that uses multiple vendors to source their OC's for their ram kits. Aesthetically they look the same, from the same series but internally they are usually built with different ram IC's.

To add:
Previously ran fine with 2x CMD32GX3M4A2400C10
Got hold of two other modules CMD16GX3M2A2400C10
they are not from the same kit of ram. This is your main problem, mixing and matching rams.

 

[1Speedy9]

Welcome to the forums, newcomer!

Did you make sure your BIOS for the motherboard was updated to the latest? As for the processor upgrade, what were you on prior? With the new processor, check to see if the socket has any bent or broken pins.

Got hold of two other modules CMD16GX3M2A2400C10
If you can, please pass on images of the PCB number on the ram kits. Corsair is the only brand that uses multiple vendors to source their OC's for their ram kits. Aesthetically they look the same, from the same series but internally they are usually built with different ram IC's.

To add:
Previously ran fine with 2x CMD32GX3M4A2400C10
Got hold of two other modules CMD16GX3M2A2400C10
they are not from the same kit of ram. This is your main problem, mixing and matching rams.

Thank you.

I don't remember what it was called, I'll have to find it. Bios is uptodate.

I know they're not from the same (all 4), but they still fit together two by two, and I also think that even though they're not from the same company, I should still be able to boot the PC, but I can't.

So I expect them to be interpreted as the same, all four. Can only boot with two, and it doesn't matter which of the two I use, will only boot with one in A1 and A2, not A1 and B1, will not boot in dual mode, and don't understand it. (Pic later)

I know that the CPU doesn't support ECC, but that shouldn't be a problem, right?

 

[1Speedy9]

How can I add/upload pictures?

[

https://imgur.com/a/7wRb3VQ

View: https://imgur.com/a/7wRb3VQ



Ram, and the old CPU and the new one.

I'll have to investigate later if there's a bent leg. It takes a lot 😔 Is there a way in the bios where I can "trick" the bios into thinking they're different. Thinking of setting them up, each one differently? So first boot it up with two modules, change the setup, and then try with the other two?

 

[Misgar]

It previously ran fine with 2 x CMD32GX3M4A2400C10 and will still run with the two modules, just not in dual channel.

If your computer does not run in Dual Channel mode with two identical DIMMs and hence only runs the two DIMMs in Single Channel mode, it implies one of the two IMC (Integrated Memory Controllers) in your CPU has stopped working.

If you check your motherboard manual, try to confirm if you were using IMC Channel A or IMC Channel B memory slots. If an IMC Channel has failed, two of the DIMM sockets (associated with the good channel) will work and two of the DIMM sockets (associated with the bad channel) will not work.

Failure of one IMC channel can be due to bent pins in the CPU socket, a partially faulty CPU, broken tracks between the CPU and DIMM sockets, or a damaged DIMM socket. This all presupposes you've run a full MemTest86 scan on each DIMM separately, to confirm they're all 100% working on their own.

The more you mix timings with unmatched memory, the less likely DIMMs are to work together. Even on a fully working board with two good IMCs, four DIMMs are often harder to drive than two. Extra DIMMs mean more loading on the IMC bus.

 

[1Speedy9]

If your computer does not run in Dual Channel mode with two identical DIMMs and hence only runs the two DIMMs in Single Channel mode, it implies one of the two IMC (Integrated Memory Controllers) in your CPU has stopped working.

If you check your motherboard manual, try to confirm if you were using IMC Channel A or IMC Channel B memory slots. If an IMC Channel has failed, two of the DIMM sockets (associated with the good channel) will work and two of the DIMM sockets (associated with the bad channel) will not work.

Failure of one IMC channel can be due to bent pins in the CPU socket, a partially faulty CPU, broken tracks between the CPU and DIMM sockets, or a damaged DIMM socket. This all presupposes you've run a full MemTest86 scan on each DIMM separately, to confirm they're all 100% working on their own.

The more you mix timings with unmatched memory, the less likely DIMMs are to work together. Even on a fully working board with two good IMCs, four DIMMs are often harder to drive than two. Extra DIMMs mean more loading on the IMC bus.

I did a quick investigation, examined the DIMM pins, and couldn't see anything that indicated a fault. The CPU requires several things, and can I first investigate at another time, but could be the problem.

I know how the DIMM is divided, and tried both channels, but as soon as they are put in dual, I receive beeps. But gives a very good explanation of what you say about IMC. (added new image in the link, above DIMM)

I remember with the old CPU, I had some problems getting it to start up with the same ram. I think I first started it in single mode, and afterwards I could move one over, then it started in dual.