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More DDR2 RAM for old box

post #1 of 5
Thread Starter 
I'm retiring my old desktop into a dev server for linux development. Since RAM is so cheap and 64-bit ubuntu is free, I want to add some RAM to it. It is:

* Intel E6750 2.66Ghz dual core chip
* Gigabyte GA-P35-DS3L
* 2 x 1GB G. Skill DDR2 6400

I'm debating what kind of RAM to get. Is it OK to have two 1GB modules in one channel and 2GB modules in the other channel? Is there any sense in getting 1066 RAM? The mobo manual says its OK for the two channels to have different speed RAM in them but I don't know if the mobo lets me set the speed for each channel. In fact, I don't even really know how to get the speed up from 800Mhz.
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post #2 of 5
Anything in particular you are concerned about?
Personally I'd see how it went, first.
Once you start dipping excessively into swap, it's time for a RAM upgrade.

IIRC Ubuntu server utilizes around ~200 MB of RAM on boot..
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post #3 of 5
Thread Starter 
I'm basically concerned about paying too much for RAM modules I can't fully utilize. I'm included to by these from newegg:
http://www.newegg.com/Product/Produc...82E16820231122

I haven't even begun to use this server enough to tax it beyond the 2GB is has in it. I do expect to put it through the ringer at some point testing some multithreaded apps.

The basic idea is that because RAM is cheap, I want to buy some and fill out the 4 slots in the machine.
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post #4 of 5
You can have different modules on different channels, but the system will throttle to the slowest module. It will see if you have 2x1gb on one channel and 2x2 on the second channel, and will see it as 6gb total, but the entire system will run at the slower channel.
    
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post #5 of 5
Thread Starter 
Thanks for the responses!

Quote:
Originally Posted by straha View Post
You can have different modules on different channels, but the system will throttle to the slowest module. It will see if you have 2x1gb on one channel and 2x2 on the second channel, and will see it as 6gb total, but the entire system will run at the slower channel.
You may be right, but the motherboard manual mentions "Intel Flex Memory Technology":
Code:
This motherboard provides four DDR2 memory sockets and supports Dual Channel Technology.  After the memory is installed, the BIOS will automatically detect the specifications and capacity of the memory.  Enabling Dual Channel memory mode will double the original memory bandwidth
There is no description in this manual about how to enable Dual Channel memory mode.

More info:
Code:
When enabling Dual Channel mode with two of four memory modules, it is recommended that memory of the same capacity, brand, speed, and chips be used and installed in the same colored DDR2 sockets for optimum performance.
This also doesn't make any promises about different speeds working out well.

The mobo specs say that the FSB speeds supported are 1333/1066/800. Doesn't the FSB determine the memory speed too? Because it only lists 1066/800/667 memory speeds as being supported.

And, like I said, the BIOS is a bit confusing. I don't see any way to set the memory speed at a specific clock speed and I don't see any way to enable dual channel memory.
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Trusty Steed
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