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Confused about memory configuration/size


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#1 DnDer

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Posted 09 March 2009 - 09:38 PM

Motherboard Documentation
4 184-pin DDR DIMM sockets
Supports Dual Channel DDR400/DDR333/DDR266 DIMM
Supports 128MB/256MB/512MB/1GB unbuffered DRAM
Supports up to 3GB DRAM (Max)
Supports only 2.5V DDR DIMM


Now, I guess I made an amateur mistake. I had 2x 512MB sticks in there, and I dropped for another pair of 512 DIMMs when I went to Tiger. My system is only reading 1GB of memory available. Just to make 100% sure I was wrong... DDR DIMMs require pairs to get the memory rating on 1 stick (ie, 2x 512s = 512 MB for the system)?

Second question: How, when my motherboard supports 4 channels that can take a max of 1GB at a time - to create a total of 2GB - can the board support or hold 3GB or memory? That can't be mathematically possible, can it? =\

<is trying to run Linux distros in Virtual box, and it's taking forever to instal... desperately could use more memory, and has apparently spaced on how/what to buy to make the system function right>

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#2 DJBPace07

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Posted 09 March 2009 - 09:48 PM

If you wanted to reach the 3GB max you would need two 1GB sticks and two 512MB sticks. Which memory are you using and which do you currently have installed? It's usually a good idea to stick with the same memory speed that is already installed when you upgrade. So, if you have two DDR400's, you should install two more DDR400's. Your PC is dual channel, so you have two banks of two slots each bank supporting dual channel with identical memory only. Memory is often sold in kits. So if you got a 512MB memory kit, both sticks would be 256MB each. A 1GB kit would be two 512MB sticks. That is assuming the kit holds two sticks. If you were wanting to max out your RAM, you would get one 2GB kit (two 1GB sticks in the kit) and a 1 GB kit (two 512MB sticks).

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#3 DnDer

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Posted 09 March 2009 - 10:12 PM

EVEREST ULTIMATE REPORT

[ DIMM1: Corsair XMS CMX512-2700C2 ]

Memory Module Properties:
DIMM1: Corsair XMS CMX512-2700C2
Module Name Corsair XMS CMX512-2700C2
Serial Number None
Module Size 512 MB (2 ranks, 4 banks)
Module Type Unbuffered
Memory Type DDR SDRAM
Memory Speed PC2700 (166 MHz)
Module Width 64 bit
Module Voltage SSTL 2.5
Error Detection Method None
Refresh Rate Reduced (7.8 us), Self-Refresh

[ DIMM2: [ TRIAL VERSION ] ]

Memory Module Properties:
Module Name [ TRIAL VERSION ] NOTE: This is an identical Corsair module. Came with the board, which was given by a friend.
Serial Number None
Module Size 512 MB (2 ranks, 4 banks)
Module Type [ TRIAL VERSION ]
Memory Type DDR SDRAM
Memory Speed PC2700 (166 MHz)
Module Width 64 bit
Module Voltage SSTL 2.5
Error Detection Method None
Refresh Rate Reduced (7.8 us), Self-Refresh

[ DIMM3: [ TRIAL VERSION ] ]

Memory Module Properties:
Module Name [ TRIAL VERSION ] T3 and 4 are Centon-branded. It was all Tiger had in stock that day when I stopped in.
Serial Number None
Module Size 512 MB (1 rank, 4 banks)
Module Type [ TRIAL VERSION ]
Memory Type DDR SDRAM
Memory Speed PC3200 (200 MHz)
Module Width 64 bit
Module Voltage SSTL 2.5
Error Detection Method None
Refresh Rate Reduced (7.8 us), Self-Refresh

[ DIMM4: [ TRIAL VERSION ] ]

Memory Module Properties:
Module Name [ TRIAL VERSION ]
Serial Number None
Module Size 512 MB (1 rank, 4 banks)
Module Type [ TRIAL VERSION ]
Memory Type DDR SDRAM
Memory Speed PC3200 (200 MHz)
Module Width 64 bit
Module Voltage SSTL 2.5
Error Detection Method None
Refresh Rate Reduced (7.8 us), Self-Refresh

That's a total of 4 512-MB sticks of DDR RAM. Even if the speeds are different, all 4 should be operating at the slowest speed, right? I'm fine with that. I'll survive. Can't figure why I'm reporting 1GB of RAM in the system properties, though, if what you say is true.

Edited by DnDer, 09 March 2009 - 10:16 PM.


#4 fairjoeblue

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Posted 09 March 2009 - 11:17 PM

With 4 X 512MB you should be showing 2GB total if all sticks are compatible with each other.

Try each set without the other & see if each set of 2 X 512MB show as 1GB.
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#5 burn1337

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Posted 10 March 2009 - 01:46 AM

I would try putting the two pc3200's in the first bank, and the pc2700's in the second bank... Though it would be better if they were both the same speeds, but it should be able to recognize both speeds if you put the faster speeds in the primary bank...

Edited by burn1337, 10 March 2009 - 01:47 AM.


#6 dc3

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Posted 10 March 2009 - 07:35 AM

System Properties isn't going to show the total amount of physical memory, you need to look in System Information.

Start> All Programs> Accessories> System Tools> System Information.

What is the make and model of the mother board, if this is a custom build? If it is a retail computer what is the make and model?

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#7 DnDer

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Posted 10 March 2009 - 09:41 AM

<working right now... placeholder for when I get home to supply you with documentation>

#8 DnDer

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Posted 16 March 2009 - 10:31 PM

Okay... test results indicate a bad slot.

TEST: Corsair 1
slot 1: 524288
slot 2: 524288
slot 3: 524288
slot 4: 524288

TEST: Corsair 2
slot 1: 524288
slot 2: 524288
slot 3: 524288
slot 4: 524288

TEST: Ememoy 1
slot 1: 524288
slot 2: 524288
slot 3: 524288
slot 4: comp powers on, no video, no POST display

TEST: Ememoy 2
slot 1: 524288
slot 2: 524288
slot 3: 524288
slot 4: comp powers on, no video, no POST display

...need a new mobo, I guess. At least it still works with 1 GB of ram.




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