Memory doesn't work with all 4 slots

[eidairaman1]

2133 vs 3200, the ram may need manual timing and voltage adjustments as XMP profiles may be totally different between the 2

Let me look at motherboard ram slot configs as well

Ensure your mobo isnt flexing from too much tension by the cpu heatsink

 

[zx128k]

So far the motherboard does not support 4 dimms for most IC's made by CORSAIR. This is what I checked so far.

Example,

CORSAIR

CMK16GX4M4A2666C15 ver5.20

DDR4

2133MHz

2667 MHz

SK hynix

1.2v

SINGLE

4GB

√ | √ |

CORSAIR

CMK16GX4M4A2666C16 ver3.21

DDR4

2133MHz

2667 MHz

Micron

1.2v

SINGLE

4GB

√ | √ |

CORSAIR

CMK32GX4M2A2666C16 ver4.31

DDR4

2133MHz

2667 MHz

Samsung

1.2v

DUAL

16GB

√ | √ |

CORSAIR

CMK64GX4M8B3200C16 ver4.31

DDR4

2133MHz

3200 MHz

Samsung

1.35v

SINGLE

8GB

√ | √ |

CORSAIR

CMK64GX4M4A2666C16 ver3.31

DDR4

2133MHz

2667 MHz

Micron

1.2v

DUAL

16GB

√ | √ |

CORSAIR	CMK16GX4M2A2400C16 ver3.31	DDR4	2133MHz	2400 MHz	Micron	1.2v	SINGLE	8GB	√ | √ |
CORSAIR	CMK32GX4M2A2666C16R ver3.31	DDR4	2133MHz	2667 MHz	Micron	1.25v	DUAL	16GB	√ | √ |

There are some kits that do support 4x DIMMS. Examples

CORSAIR	CMU32GX4M4A2666C16 ver5.20	DDR4	2133MHz	2667 MHz	SK hynix	1.2v	DUAL	8GB	√ | √ | √
CORSAIR	CMU64GX4M4A2666C16 ver5.39	DDR4	2133MHz	2667 MHz	SK hynix	1.2v	DUAL	16GB	√ | √ | √

CORSAIR

CMV16GX4M1A2133C15

DDR4

2133MHz

2133 MHz

Samsung K4A8G085WB

1.2V

DUAL

16GB

√ |√ |√

Given all the RAM that starts with CMK only support 2xdimms. It does not look good for CMK16GX4M2A2133C13

 

[oisterb]

So far the motherboard does not support 4 dimms for most IC's made by CORSAIR. This is what I checked so far.

Example,

CORSAIR

CMK16GX4M4A2666C15 ver5.20

DDR4

2133MHz

2667 MHz

SK hynix

1.2v

SINGLE

4GB

√ | √ |

CORSAIR

CMK16GX4M4A2666C16 ver3.21

DDR4

2133MHz

2667 MHz

Micron

1.2v

SINGLE

4GB

√ | √ |

CORSAIR

CMK32GX4M2A2666C16 ver4.31

DDR4

2133MHz

2667 MHz

Samsung

1.2v

DUAL

16GB

√ | √ |

CORSAIR

CMK64GX4M8B3200C16 ver4.31

DDR4

2133MHz

3200 MHz

Samsung

1.35v

SINGLE

8GB

√ | √ |

CORSAIR

CMK64GX4M4A2666C16 ver3.31

DDR4

2133MHz

2667 MHz

Micron

1.2v

DUAL

16GB

√ | √ |

CORSAIR	CMK16GX4M2A2400C16 ver3.31	DDR4	2133MHz	2400 MHz	Micron	1.2v	SINGLE	8GB	√ | √ |
CORSAIR	CMK32GX4M2A2666C16R ver3.31	DDR4	2133MHz	2667 MHz	Micron	1.25v	DUAL	16GB	√ | √ |

There are some kits that do support 4x DIMMS. Examples

CORSAIR	CMU32GX4M4A2666C16 ver5.20	DDR4	2133MHz	2667 MHz	SK hynix	1.2v	DUAL	8GB	√ | √ | √
CORSAIR	CMU64GX4M4A2666C16 ver5.39	DDR4	2133MHz	2667 MHz	SK hynix	1.2v	DUAL	16GB	√ | √ | √

CORSAIR

CMV16GX4M1A2133C15

DDR4

2133MHz

2133 MHz

Samsung K4A8G085WB

1.2V

DUAL

16GB

√ |√ |√

Given all the RAM that starts with CMK only support 2xdimms. It does not look good for CMK16GX4M2A2133C13

So the ram is not compatible?

 

[zx128k]

So the ram is not compatible?

Its not in the QVL or at least I could not find it. Also RAM with a close match for model number, starting with CMK16GX4M are in the QVL for supporting 2 x DIMM configurations only. You can try contacting the support for the motherboard and ask if your ram is supported for 4 x DIMMs. Also sometimes BIOS updates add more memory support.

 

[oisterb]

Its not in the QVL or at least I could not find it. Also RAM with a close match for model number, starting with CMK16GX4M are in the QVL for supporting 2 x DIMM configurations only. You can try contacting the support for the motherboard and ask if your ram is supported for 4 x DIMMs. Also sometimes BIOS updates add more memory support.

Thankyou, After work I will update bios and see if that works. I haven’t updated it in 3 years so

 

[eidairaman1]

Its not in the QVL or at least I could not find it. Also RAM with a close match for model number, starting with CMK16GX4M are in the QVL for supporting 2 x DIMM configurations only. You can try contacting the support for the motherboard and ask if your ram is supported for 4 x DIMMs. Also sometimes BIOS updates add more memory support.

Thankyou, After work I will update bios and see if that works. I haven’t updated it in 3 years so

Interesting enough.

• DDR4 Memory

1866/ 2133/ 2400/ 2667Mhz (by JEDEC)
2667/ 2800/ 2933/ 3000/ 3066/ 3200/ 3466 MHz (by A-XMP OC MODE)

Lets not jump to conclusions yet.
I wouldn't expect that board to run over 2667-2933MHz with all slots occupied.

Both corsair kits are ryzen badged on the website

 

[zx128k]

CORSAIR

CMK16GX4M4A2133C15

DDR4

2133MHz

2133 MHz

N/A

1.2V

SINGLE

4GB

√ |√ |√

This is very close to your RAM CMK16GX4M2A2133C13.

But there is also CMK16GX4M2A2400C16 which could be just a faster version of your RAM. It only support 2xDIMM configurations. Note how all the mircon kits in the list for CORSAIR appear to be just 2xDIMMs.

CORSAIR

CMK16GX4M2A2400C16 ver3.31

DDR4

2133MHz

2400 MHz

Micron

1.2v

SINGLE

8GB

√ | √ |

Just contact the manufacture first, dont rush to flash the BIOS. Sometimes its just a risk with no benefit. Also Thaiphoon Burner can read the SPD on the RAM kit and tell us the IC of the manufacture. This way we can confirm if its Micron or not. You can post a screenshot. Also the second picture is of a different kit CMK16GX4M2B3200C16. This could be samsung IC's.

Closest match is below, both kits could only support 2xDIMMs and my not work together anyway as 4xDIMMS.
CMK64GX4M8B3200C16 ver4.31 posted above.

 

[eidairaman1]

https://www.corsair.com/us/en/Categories/Products/Memory/VENGEANCE-LPX/p/CMK16GX4M2A2133C13

Notice the Letter A?

 

[zx128k]

Yes the second kit could very well be another manufacture.

Yes that second kit is marked as the manufacture being Samsung. DRAM components K4A8G085WB-BCPB. That could be Samsung K4A8G085WB which supports 4xDimm configs in the QVL. The second kit CMK16GX4M2A2133C13 is not on the b-die finder webite and the same for CMK16GX4M2B3200C16.

 

[eidairaman1]

Yes the second kit could very well be another manufacture.

View attachment 244999

Yes that second kit is marked as the manufacture being Samsung. DRAM components K4A8G085WB-BCPB. That could be Samsung K4A8G085WB which supports 4xDimm configs in the QVL.

So what would be the first kit, to me that letter A or B, D, M etc could be the factor that makes a config easy or a headache.

I noticed with ddr4 there is only 1 XMP profile (at least with the Crucial Ballistix 3600 Gaming) where as with ddr3 there is 3 of them (my kit)

So to me the 3200 kit would need to be forced to run at 2133 with the same timings and volts as that kit or the 2133 kit timings would need to be loosened

 

[zx128k]

So what would be the first kit, to me that letter A or B, D, M etc could be the factor that makes a config easy or a headache.

I noticed with ddr4 there is only 1 XMP profile (at least with the Crucial Ballistix 3600 Gaming) where as with ddr3 there is 3 of them (my kit)

So to me the 3200 kit would need to be forced to run at 2133 with the same timings and volts as that kit or the 2133 kit timings would need to be loosened

The issues,
1: The first kit is likely only supported as 2xDIMMs. Could be micron
2: The second kit is different IC's but they are in the QVL as supporting 4xDIMMs configurations.
3: Two different kits with different IC manufactures may not work together. Both will likely post if they are the only RAM installed but wont boot together.

The RAM kits will boot at the Jedec speeds and you have to enable any xmp profile afterwards. No post means there is no way to tune the timings and get both kits to work. This is an optinion if both kits are the same but different timings. You just tune a set of timings both kits support. You cant do this if both kits are different IC's. One the IMC wont like it as often both kits have widely different settings, this makes it very hard/impossible for the motherboard/IMC to train the RAM and boot.

The good news is following kit is likely supported. note the Samsung K4A8G085WB, this is the same as the typhoon burner output above for CMK16GX4M2B3200C16 which is Samsung K4A8G085WB-BCPB. There is high hopes for this kit booting and working as 4xdimms.

CORSAIR

CMV16GX4M1A2133C15

DDR4

2133MHz

2133 MHz

Samsung K4A8G085WB

1.2V

DUAL

16GB

√ |√ |√

 

[eidairaman1]

The issues,
1: The first kit is likely only supported as 2xDIMMs. Could be micron
2: The second kit is different IC's but they are in the QVL as supporting 4xDIMMs configurations.
3: Two different kits with different IC manufactures may not work together. Both will likely post if they are the only RAM installed but wont boot together.

The RAM kits will boot at the Jedec speeds and you have to enable any xmp profile afterwards. No post means there is no way to tune the timings and get both kits to work. This is an optinion if both kits are the same but different timings. You just tune a set of timings both kits support. You cant do this if both kits are different IC's. One the IMC wont like it as often both kits have widely different settings, this makes it very hard/impossible for the motherboard/IMC to train the RAM and boot.

Hence why I'm thinking the 2 diff letters will make this too difficult to work, so the op either needs to retrun that ram and make sure he has an A coded set or sell the old kit and buy a quad kit, but why do that when desnities of ddr 4 are above 32GB anyway.

Corsair has been troublesome since the DDR2/3 days, same with Kingston

 

[zx128k]

Hence why I'm thinking the 2 diff letters will make this too difficult to work, so the op either needs to retrun that ram and make sure he has an A coded set or sell the old kit and buy a quad kit, but why do that when desnities of ddr 4 are above 32GB anyway.

Corsair has been troublesome since the DDR2/3 days, same with Kingston

The old kit may not work as 4xdimms, the motherboard manufacture should know. The second kit is in the QVL and does not support 4xDIMMs.

QVL memory

CORSAIR

CMK16GX4M2B3200C16 ver4.32

DDR4

2133MHz

3200 MHz

Samsung 5WC

1.35v

SINGLE

8GB

√ | √ |

 

[oisterb]

The issues,
1: The first kit is likely only supported as 2xDIMMs. Could be micron
2: The second kit is different IC's but they are in the QVL as supporting 4xDIMMs configurations.
3: Two different kits with different IC manufactures may not work together. Both will likely post if they are the only RAM installed but wont boot together.

The RAM kits will boot at the Jedec speeds and you have to enable any xmp profile afterwards. No post means there is no way to tune the timings and get both kits to work. This is an optinion if both kits are the same but different timings. You just tune a set of timings both kits support. You cant do this if both kits are different IC's. One the IMC wont like it as often both kits have widely different settings, this makes it very hard/impossible for the motherboard/IMC to train the RAM and boot.

The good news is following kit is likely supported. note the Samsung K4A8G085WB, this is the same as the typhoon burner output above for CMK16GX4M2B3200C16 which is Samsung K4A8G085WB-BCPB. There is high hopes for this kit booting and working as 4xdimms.

CORSAIR

CMV16GX4M1A2133C15

DDR4

2133MHz

2133 MHz

Samsung K4A8G085WB

1.2V

DUAL

16GB

√ |√ |√

I tried using 8gb from one kit and 8 gbs from the other and it worked.

 

[zx128k]

Mixing RAM like that can cause the RAM to be unstable. I have never tried mixing kits like that. I am still searching the QVL to check everything because they have no search option. :/ Its a pain but I need to make sure I have it right.

CMK16GX4M2A2133C13 is not in the QVL at all but its 2133 so I would expect it to work at least 2xDIMMs.

CMK16GX4M2B3200C16 ver 5.22 has the match below but this is a different version. The bad news is 1 or 2 DIMMs are supported. We have enough information to suspect the CMK16GX4M2B3200C16 ver 5.22 could not work when configurated as 4xDIMMs. Typhoon can read the SPD and tell us about the CMK16GX4M2A2133C13 kitand what IC's it uses. This will allow us to see if the same IC's are use in other kits by different manufactures in the QVL and see how many DIMM slots we can use with that kit.

CORSAIR

CMK16GX4M2B3200C16 ver4.32

DDR4

2133MHz

3200 MHz

Samsung 5WC

1.35v

SINGLE

8GB

√ | √ |

 

[eidairaman1]

Because its only 2 dimms, not 4

Make sure to have 1 kit in A1 and B1 and then A2 and B2

 

[AusWolf]

View attachment 244992
This is a full list of parts excluding the graphics card which is now 3070ti. The new ram is Corsair vengeance LPX 16gb 3200MHz


I’ve posted a photo of the specifications. Sorrry I’ve been busy haha haven’t had time to look at the pc

I think I see the problem. Your old ram is listed as 2133 MHz and the new one is 3200. Can you do a CMOS reset, then go into the BIOS, and make sure your ram runs at 2133 MHz? Unfortunately, that looks like the only speed both the old and new ram can do. If the CMOS reset still doesn't make the system work, then your old and new ram are incompatible, I'm afraid.

 

[chrcoluk]

A lot tend to say its due to not buying a 4 dimm kit.

But I think its far simpler then that.

Most boards are daisy chain style which means they cannot handle ram as fast and low latency as they can in 2 dimm configuration.

Secondly IMC's on CPU's cant handle 4 slot configurations as much as 2 slots.

Most motherboard manuals will state the secondary slots are specced at lower speeds due to less optimal tracing.

The first thing you need to do is reset bios to defaults, and see if it posts and runs ok with all 4 dimms on basic JEDEC spec, aka no higher than 2400mhz, ideally 2133mhz with loose timings.

If it is indeed the case your modules have different rated speed/timings, then configure them for the lowest spec'd modules. But make sure you test first with 2133mhz.

 

[ThrashZone]

Hi,
I was really surprised reading a manual lately
Dual channel board
Two slots for single rank sticks
Two slots for dual rank sticks
So with that I'll be watching for that and not buy that type of cheap ass board

 

[grammar_phreak]

Hi,
I was really surprised reading a manual lately
Dual channel board
Two slots for single rank sticks
Two slots for dual rank sticks
So with that I'll be watching for that and not buy that type of cheap ass board

Is that the case with Zen 2 and Zen 3 on this kind of board as well? I remember Zen and Zen+ having fussy memory controllers and a lot of people had trouble getting those platforms to work with 4 sticks of RAM.

 

[ThrashZone]

Is that the case with Zen 2 and Zen 3 on this kind of board as well? I remember Zen and Zen+ having fussy memory controllers and a lot of people had trouble getting those platforms to work with 4 sticks of RAM.

Hi,
Not sure the online manual memory stick arrangement clearly showed this though.

1 & 3 for single rank
2 & 4 for dual rank

 

[eidairaman1]

Hi,
Not sure the online manual memory stick arrangement clearly showed this though.

1 & 3 for single rank
2 & 4 for dual rank

The manual is imperitive for configuration.
Most times A1 and B1 are linked and A2 and B 2 are linked (interleaved slots).

So typically from left to right with cpu to left A1 A2 B1 B2. A2 and B2 are used for 2 modules only.

Mismatched ram to me means clocks, timings and volts require manual setting as, if im not mistaken DDR4 only has 1 XMP Profile, unlike DDR3 which had 3.

So i believe in this instance for testing all of the ram should be at 2133 with a little more volts applied.

 

[Nike_486DX]

I recetly purchase 16 more gb of ram and when i put then in my computer would not output a display. I did some trouble shooting and the ram only workes if two slots are filled. I tried changing the ram so the old stuff and the new stuff were together, and it worked so it cannot be the ram. All the slots work but only two can be used at a time of the computer will not turn on. Ive tried looking through the bios and there doesnt seem to be a problem. Please help.

you could try booting with whatever ram and set 2133mhz in bios, then fill up the other slots and see if you manage to boot with all 4. Also you provided info about some b450 mobo and 2600x, while in the beginning you mentioned z370 motherboard and some i5 5600K (8600K i guess), which setup is yours?

Also bios update is not recommended unless you know for sure the newer patch has "improved memory support", and you got a ups hooked up just in case, etc. Only perform the flash from within the bios or dos, but never in windows.

 

[ThrashZone]

The manual is imperitive for configuration.
Most times A1 and B1 are linked and A2 and B 2 are linked (interleaved slots).

So typically from left to right with cpu to left A1 A2 B1 B2. A2 and B2 are used for 2 modules only.

Mismatched ram to me means clocks, timings and volts require manual setting as, if im not mistaken DDR4 only has 1 XMP Profile, unlike DDR3 which had 3.

So i believe in this instance for testing all of the ram should be at 2133 with a little more volts applied.

Hi,
No telling about ddr3 ? my only ddr3 system was locked acer aspire

ddr4 depends on the memory manufacture
Corsair set I have has 2 xmp profiles 2666 rated speed and a additional 2800 xmp profile
Trident-z all of them only have one at their rated speed.

Not sure more dimm voltage at default system speed would help probably won't hurt but sticks are likely defective if they have issues at that low speed.

 

[zx128k]

you could try booting with whatever ram and set 2133mhz in bios, then fill up the other slots and see if you manage to boot with all 4. Also you provided info about some b450 mobo and 2600x, while in the beginning you mentioned z370 motherboard and some i5 5600K (8600K i guess), which setup is yours?

Also bios update is not recommended unless you know for sure the newer patch has "improved memory support", and you got a ups hooked up just in case, etc. Only perform the flash from within the bios or dos, but never in windows.

There is nothing like updating the BIOS but bricking the board. Then finding out the bios update would have not made a difference.