Upgraded ram shows single channel

[JCarax]

Hi,

I upgraded my ram kit the other day. I already had Corsair vengenace led 3000mhz(2x8) and I bought another kit.
The previous rams were on 2nd and 4th slots running dual channel.

I installed the new ones on the 1st and 3rd slots and they are displayed as single channel.

I checked the CPU Z monitor and there is a difference in ras#precharge number.

How can I run all of them on the same channel ?

 

[JCarax]

edit :

Btw, on the memory tab it shows dual channel :

Only the recently installed sticks on 1st and 3rd slots show single channel.

 

[kanewolf]

Rank and channel are not the same. Rank is on an individual DIMM where as channel is interface to the CPU.
Here is a good definition of DIMM ranks -- http://h17007.www1.hpe.com/docs/iss/DL380pGen8/setup_install/advanced/Content/138678.htm

You can have single rank DIMMs in a dual channel system (as you do).

 

[shrapnel_indie]

As best as I know of, you won't be able to run them all as a single channel. The best you can do is two sticks per channel, evenly split.

Now what I see here is the ranks are different and no mention of channels on that tab. Also note that ranks ≠ channels.

 

[JCarax]

Ok so my system is running dual channel, but those 1 and 3rd slots anre single rank dimms.
That single dimm is a feature of the memory slot, aka the mobo right ?

As for the RAS#Precharge number. Why is one of them set to 14 and the other to 15 ?

 

[kanewolf]

Ok so my system is running dual channel, but those 1 and 3rd slots anre single rank dimms.
That single dimm is a feature of the memory slot, aka the mobo right ?

As for the RAS#Precharge number. Why is one of them set to 14 and the other to 15 ?

No rank is a characteristic of the DIMM module. Independent of the motherboard.

 

[shrapnel_indie]

Ok so my system is running dual channel, but those 1 and 3rd slots anre single rank dimms.
That single dimm is a feature of the memory slot, aka the mobo right ?

As for the RAS#Precharge number. Why is one of them set to 14 and the other to 15 ?

As stated RANK is a characteristic of the RAM module, not the motherboard or RAM slot. The difference in the RAS#Precharge numbers can be attributed to small differences in performance of the underlying memory in each RAM module. If you see any instability when it is set to 14 (if you're running it that slow of speed), I'd suggest matching the 15 from the other set. Chances are you have it running at 2133 (1066) or using XMP to run it at 3000 (1499)

 

[JCarax]

Ok so my system is running dual channel, but those 1 and 3rd slots anre single rank dimms.
That single dimm is a feature of the memory slot, aka the mobo right ?

As for the RAS#Precharge number. Why is one of them set to 14 and the other to 15 ?

As stated RANK is a characteristic of the RAM module, not the motherboard or RAM slot. The difference in the RAS#Precharge numbers can be attributed to small differences in performance of the underlying memory in each RAM module. If you see any instability when it is set to 14 (if you're running it that slow of speed), I'd suggest matching the 15 from the other set. Chances are you have it running at 2133 (1066) or using XMP to run it at 3000 (1499)

Ok then I'm having difficulty understanding. If it is a character of the ram module, how can 2 identical kits have different ranks ?

As for RAS#Precharge, I don't know how I can change it for each module.

I have XMP disabled, I have the ram speed manually set to 2666mhz with manuel timings of 13 15 15 30

 

[kanewolf]

Two "identical" kits can be internally different because the manufacturer changed RAM chip suppliers or something. These internal differences are why matched sets of RAM are recommended.

WHY do you believe you need to change any of the timings on your RAM?

 

[shrapnel_indie]

Ok so my system is running dual channel, but those 1 and 3rd slots anre single rank dimms.
That single dimm is a feature of the memory slot, aka the mobo right ?

As for the RAS#Precharge number. Why is one of them set to 14 and the other to 15 ?

As stated RANK is a characteristic of the RAM module, not the motherboard or RAM slot. The difference in the RAS#Precharge numbers can be attributed to small differences in performance of the underlying memory in each RAM module. If you see any instability when it is set to 14 (if you're running it that slow of speed), I'd suggest matching the 15 from the other set. Chances are you have it running at 2133 (1066) or using XMP to run it at 3000 (1499)

Ok then I'm having difficulty understanding. If it is a character of the ram module, how can 2 identical kits have different ranks ?

As for RAS#Precharge, I don't know how I can change it for each module.

I have XMP disabled, I have the ram speed manually set to 2666mhz with manual timings of 13 15 15 30

Okay. touching on the last part first (manual timings)... If your RAM is running at that speed, without issues, good. memtest86 will help prove it is as stable and working as it appears. If you use the XMP settings though you should be able to get that 2998/3000 rated speed out of them (it will bump voltage, within specs, to do it though.)

Some motherboards may let you set timings for each stick separately, but all should let you set timings for all the RAM, just as you did, applying the chosen setting to all modules.

Sometimes identical sticks (same brand and model number) can have revisions that take place without a change in model numbers. I find it odd the tRAS changed and kept the same model number, but the decision wasn't mine anyway.

 

[Yamitime]

They have identical timings with the xmp enabled . I suggest you enable xmp and it will become dual channel so long as they are in the correct slots .

 

[JCarax]

Ok so my system is running dual channel, but those 1 and 3rd slots anre single rank dimms.
That single dimm is a feature of the memory slot, aka the mobo right ?

As for the RAS#Precharge number. Why is one of them set to 14 and the other to 15 ?

As stated RANK is a characteristic of the RAM module, not the motherboard or RAM slot. The difference in the RAS#Precharge numbers can be attributed to small differences in performance of the underlying memory in each RAM module. If you see any instability when it is set to 14 (if you're running it that slow of speed), I'd suggest matching the 15 from the other set. Chances are you have it running at 2133 (1066) or using XMP to run it at 3000 (1499)

Ok then I'm having difficulty understanding. If it is a character of the ram module, how can 2 identical kits have different ranks ?

As for RAS#Precharge, I don't know how I can change it for each module.

I have XMP disabled, I have the ram speed manually set to 2666mhz with manual timings of 13 15 15 30

Okay. touching on the last part first (manual timings)... If your RAM is running at that speed, without issues, good. memtest86 will help prove it is as stable and working as it appears. If you use the XMP settings though you should be able to get that 2998/3000 rated speed out of them (it will bump voltage, within specs, to do it though.)

Some motherboards may let you set timings for each stick separately, but all should let you set timings for all the RAM, just as you did, applying the chosen setting to all modules.

Sometimes identical sticks (same brand and model number) can have revisions that take place without a change in model numbers. I find it odd the tRAS changed and kept the same model number, but the decision wasn't mine anyway.

I see. I used to run this at xmp but I learnt that having faster ram speed makes kabbylake cpus run hotter so I reduced the speed and tightened the timings. Before the additional 16gb My PC ran pretty stable with these timings.

They have identical timings with the xmp enabled . I suggest you enable xmp and it will become dual channel so long as they are in the correct slots .

How do I make sure I have rams in correct slots ? I mean these 8 gig sticks supposed to be identical ?

 

[shrapnel_indie]

Ok so my system is running dual channel, but those 1 and 3rd slots anre single rank dimms.
That single dimm is a feature of the memory slot, aka the mobo right ?

As for the RAS#Precharge number. Why is one of them set to 14 and the other to 15 ?

As stated RANK is a characteristic of the RAM module, not the motherboard or RAM slot. The difference in the RAS#Precharge numbers can be attributed to small differences in performance of the underlying memory in each RAM module. If you see any instability when it is set to 14 (if you're running it that slow of speed), I'd suggest matching the 15 from the other set. Chances are you have it running at 2133 (1066) or using XMP to run it at 3000 (1499)

Ok then I'm having difficulty understanding. If it is a character of the ram module, how can 2 identical kits have different ranks ?

As for RAS#Precharge, I don't know how I can change it for each module.

I have XMP disabled, I have the ram speed manually set to 2666mhz with manual timings of 13 15 15 30

Okay. touching on the last part first (manual timings)... If your RAM is running at that speed, without issues, good. memtest86 will help prove it is as stable and working as it appears. If you use the XMP settings though you should be able to get that 2998/3000 rated speed out of them (it will bump voltage, within specs, to do it though.)

Some motherboards may let you set timings for each stick separately, but all should let you set timings for all the RAM, just as you did, applying the chosen setting to all modules.

Sometimes identical sticks (same brand and model number) can have revisions that take place without a change in model numbers. I find it odd the tRAS changed and kept the same model number, but the decision wasn't mine anyway.

I see. I used to run this at xmp but I learnt that having faster ram speed makes kabbylake cpus run hotter so I reduced the speed and tightened the timings. Before the additional 16gb My PC ran pretty stable with these timings.

They have identical timings with the xmp enabled . I suggest you enable xmp and it will become dual channel so long as they are in the correct slots .

How do I make sure I have rams in correct slots ? I mean these 8 gig sticks supposed to be identical ?

Slot 1: OLD stick
Slot 2: New Stick
Slot 3: OLD stick
Slot 4: New Stick

or reverse order of old and new.... doesn't matter... but that will be as balanced as you can get.

 

[JCarax]

Ok so my system is running dual channel, but those 1 and 3rd slots anre single rank dimms.
That single dimm is a feature of the memory slot, aka the mobo right ?

As for the RAS#Precharge number. Why is one of them set to 14 and the other to 15 ?

As stated RANK is a characteristic of the RAM module, not the motherboard or RAM slot. The difference in the RAS#Precharge numbers can be attributed to small differences in performance of the underlying memory in each RAM module. If you see any instability when it is set to 14 (if you're running it that slow of speed), I'd suggest matching the 15 from the other set. Chances are you have it running at 2133 (1066) or using XMP to run it at 3000 (1499)

Ok then I'm having difficulty understanding. If it is a character of the ram module, how can 2 identical kits have different ranks ?

As for RAS#Precharge, I don't know how I can change it for each module.

I have XMP disabled, I have the ram speed manually set to 2666mhz with manual timings of 13 15 15 30

Okay. touching on the last part first (manual timings)... If your RAM is running at that speed, without issues, good. memtest86 will help prove it is as stable and working as it appears. If you use the XMP settings though you should be able to get that 2998/3000 rated speed out of them (it will bump voltage, within specs, to do it though.)

Some motherboards may let you set timings for each stick separately, but all should let you set timings for all the RAM, just as you did, applying the chosen setting to all modules.

Sometimes identical sticks (same brand and model number) can have revisions that take place without a change in model numbers. I find it odd the tRAS changed and kept the same model number, but the decision wasn't mine anyway.

I see. I used to run this at xmp but I learnt that having faster ram speed makes kabbylake cpus run hotter so I reduced the speed and tightened the timings. Before the additional 16gb My PC ran pretty stable with these timings.

They have identical timings with the xmp enabled . I suggest you enable xmp and it will become dual channel so long as they are in the correct slots .

How do I make sure I have rams in correct slots ? I mean these 8 gig sticks supposed to be identical ?

Slot 1: OLD stick
Slot 2: New Stick
Slot 3: OLD stick
Slot 4: New Stick

or reverse order of old and new.... doesn't matter... but that will be as balanced as you can get.

As of now it is
NEW
OLD
NEW
OLD

Old ones were in 2nd and 4th slots all along.

Should I change the slots and see how it turns out ? Or should I leave them be ? Because right now they seem to be working fine.

 

[kanewolf]

If it ain't broke don't fix it. Your RAM is operating exactly as it should.

 

[JCarax]

ok thanks for the replies guys.

 

[shrapnel_indie]

How do I make sure I have rams in correct slots ? I mean these 8 gig sticks supposed to be identical ?

Slot 1: OLD stick
Slot 2: New Stick
Slot 3: OLD stick
Slot 4: New Stick

or reverse order of old and new.... doesn't matter... but that will be as balanced as you can get.

As of now it is
NEW
OLD
NEW
OLD

Old ones were in 2nd and 4th slots all along.

Should I change the slots and see how it turns out ? Or should I leave them be ? Because right now they seem to be working fine.

If it's working, no need to play with them anymore.

ok thanks for the replies guys.

Glad to be able to ASSIST you.