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View Full Version : How many DDR2 slots do I have? dmidecode output is confusing.



brnetonboy
May 11th, 2011, 02:31 AM
My motherboard has four DIMM slots for RAM (labeled XMM1, XMM2, XMM3, and XMM4). They look identical (one notch near the middle) except 1 & 3 are black plastic, 2 & 4 are white. I have only one DIMM in right now, in slot 1.

I'd assume they're all the same, but my dmiencode output seems to indicate that 1 is DDR2, while the rest are just regular DDR?

dmiencode --type 17 output:


# dmidecode 2.9
SMBIOS 2.3 present.

Handle 0x0035, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0033
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: XMM1
Bank Locator: Not Specified
Type: DDR2
Type Detail: Synchronous
Speed: 400 MHz (2.5 ns)
Manufacturer: JEDEC ID:C1 00 00 00 00 00 00 00
Serial Number: 23211205
Asset Tag: Not Specified
Part Number: 64T128020HU5A

Handle 0x0036, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0033
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: XMM2
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: Unknown
Manufacturer: JEDEC ID:
Serial Number:
Asset Tag: Not Specified
Part Number:

Handle 0x0037, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0033
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: XMM3
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: Unknown
Manufacturer: JEDEC ID:
Serial Number:
Asset Tag: Not Specified
Part Number:

Handle 0x0038, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0033
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: XMM4
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: Unknown
Manufacturer: JEDEC ID:
Serial Number:
Asset Tag: Not Specified
Part Number:


I need to buy new RAM as the current ram is probably wrong (found it lying around). What type of RAM does my motherboard take? Once I figure out what type it is I'm just going to buy the max speed even though I'm sure it's a slower mobo.

(PS, I'm running 64 bit, I think.)

brnetonboy
May 11th, 2011, 02:41 AM
Another thought: how much RAM can Ubuntu handle? I'm on Natty 64bit. Can I put 2GB DIMMs in all four slots?

brnetonboy
May 11th, 2011, 06:05 PM
should this maybe have gone in a different forum?

RayVad
July 26th, 2011, 01:58 PM
I think this is due to the fact that there are no other simms into to other slots. Dmidecode isn't able to determine the type of slot and it will not output info if nothing is in it. Dmidecode reads the info from you BIOS and only the ram module in the first slot in your case.

walt.smith1960
July 26th, 2011, 02:14 PM
If you know the model of your mother board, go to Crucial's site and use their memory advisor tool. It will give the the type of memory and max supported. You don't have to buy it there but Crucial does have a good rep AFAIK. When I upgraded RAM on my desktop, I bought Crucial memory through Sears, of all places. They had the best $ and quick delivery.