I just bought a brand new Dell PowerEdge T410 with 16GB of RAM (4x4GB units) and 2 processors.
After the purchase I decided to install 16GB (2 x 8GB) additional RAM, because I have it in my warehouse and it was sitting there unused... The RAM is exactly the same type (except for brand), so perfectly compatible.
If you have a look at this page you can see the possible memory configuration for the server. There are 4 slots (per processor) and 3 channels.Slots 1 and 4 make the first channel and slots 2 and 3 make the second and third channels (according to the manual).
In my case all I could do was to set up 2 channels, therefore I put, for each processor:
I wouldn't recommend doing this.
I'd suggest for both processors:
Slot 1: 8GB dimm
Slot 4: 4GB dimm
And nothing else (you'll have 2 unused 4GB dimms).
Typically with this Intel chipset and these Xeon processors, the rule is that each memory channel should be identically configured/populated, unless the channel is unused. 2 x 4GB dimms does not equal 1 8GB dimm in this regard.
Member since 2003
I see, therefore I will end up with 24GB of RAM.
But what are the risks of running the system with the current configuration I have? Do the RAM work at slower speed? Is there additional overhead?
And one thing is not clear to me: if all channels must be the same size, why then do they claim you can use up to 64GB of RAM? In that case you would be using (per processor)
- 16GB for channel 0
- 8GB for channel 1
- 8GB for channel 2
Isn't this a similar configuration to mine?
Thanks a lot for the help :)
If it is going to complain either way, you are better off running like this:
8GB - slot 1
4GB - slot 2
4GB - slot 3
Sure the memory amount is not identical, but it should at least be able to use 3-channel interleaving with 4GB from each channel.
The recommended configuration for 64GB of RAM is 8GB in each slot, so, yes, 16GB on channel 0.
The manual says the following, but it is not clear from the manual exactly how to make that happen ... hard to see how both can be done.
I tried Dev Mgr's suggestion to use only 24GB in channel 0... got the same warning ^^
I think I'm correct, the systems detects 2 units of RAM not being used in separate channels and signals that as suboptimal condition.
theflash1932, your suggestion produced errors, basically the same ones I was experiencing when not setting up same size channels... ;)
I'll procede with my original solution, if any errors will arise I will report it here.
thanks to you all for the support!
Yes, but knowing that it would, all I'm saying is that if you are going to get an error either way, you'll get better performance at least from that configuration.
ok, good observation.
However with the configuration you proposed, the system signals a "stronger" error, saying that the configuration is wrong.
In the configuration I chose instead the message is more a "warning", thus I'll go with this one. I don't want to risk big troubles :)