Can I install a 2 GIG memory module in Memory slot 3 if I have 1 GIG modules in slots 1 & 2

First look up your computer make/model on crucial.com. Easy way to see how many DIMM slots you have and the max capacity of your computer. Most laptops will have memory slots (DIMM slots) in one of two places. On the back there should be a small compartment with a icon for a memory chip. Remove the screw and pop the door off. If you have two slots then just add the other module you bought. They go in only one direction, look for the notch and line it up. Insert the module at an 45 degree angle until you cant see most or any of the copper contacts then push down until it clicks. If your computer has two slots and you only see one other the panel on the back then the second slot will be under the keyboard.

Top view of motherboard, scroll down. (Thought you might also like to read the reviews, and Comments)

http://www.bit-tech.net/hardware/motherboards/2007/12/06/abit_ix38_quadgt/2

Motherboard User Manual,

http://www.theraptorpit.com/forum/index.php?/forum/124-abit-motherboard-tech-support-unofficial/

1) On the motherboard the Blue ram memory slot that is closest to the copper heatsink, is ram memory Slot 1.
Also known as DIMM 1.

Ram memory ALWAYS has to be in this ram memory slot.
The Processor reads ram memory Slot 1 first.

2) The Blue ram memory slots are Slot 1 (DIMM 1), and Slot 3.
(DIMM 3)
The Black ram memory slots are Slot 2 (DIMM 2), and Slot 4.
(DIMM 4)

To run Dual Channel ram memory, means there are two LIKE ram memory modules ('Stick'), and they are installed in the SAME channel.

This would mean to alike ram memory modules, in both Blue ram memory slots, or both Black ram memory slots.

Since the ram memory modules need to be alike, they are generally purchased from the same manufacturer, and are the same kind.

Running ram memory in a dual channel configuration, is supposed to increase ram memory 'speed', up to 30 percent.

This is Baloney!
May look good on paper, but in actual use in the field it's cr@p.
Actual performance increase is more like 1 to 2 percent.
This has been proven by Tom's Hardware, and many, many motherboards, ram memory, Processors, etc.

So you have 2GB of DDR2 Sdram, huh?
Is it just one 'stick' of ram memory, or are you referring to two 1GB sticks?

If the above holds true install them in Slot 1 and Slot 3.

If not, and it is a 2GB stick of ram memory, be sure it is installed in Slot 1 (DIMM 1)
Install the 1GB stick in Slot 2.

It isn't the same as the 2GB stick.
It is 1GB.
Does NOT go in a dual channel configuration.

(Catching all this? There is NO dual channel ram memory!

It is ram memory that is -> ALIKE, and used in a -> dual channel configuration.
Used in two separate ram memory slots, that support the dual channel configuration.

Sold with the advertising scheme of 'Dual Channel', but really just means the two ram memory modules, (Or four), are -> alike.

1) Same Voltage used
2) Same Ram Timings
3) Same Chip Configuration
4) Same size in amount
5) Same frequency rate ('Speed')

With ram memory in a dual channel configuration, the ram memory modules team up on the task.)

For additional questions please post in a Comment.

Regards,
joecoolvette

did the computer start up ok with the last configuration?

put the largest ram closest to CPU central processing unit make sure that the ram are of the same brand/type some motherboards only accept a certain brand/type

max ram per slot is 1gb, for 2GB total. A 2 GB module will not work

http://www.crucial.com/store/listparts.aspx?model=Aspire%204315

Yes you can. Your best is to use the largest and best ram in the number one slot. I would remove ALL the ram and start with the 2 gig in the first slot - then add others until you get the error message - remove that one and keep the rest.

The computer has two memory expansion slots—Slot A and
Slot B. You can install one or two memory modules.

1 Shut down your computer completely using the Shut Down
command.

2 Unplug the computer.
CAUTION: Installing a memory module with the computer’s
power on may damage the computer, the module, or both.

3 Close the display panel and remove any cables you may have
connected.

4 Turn the computer upside down.

5 Locate and remove the screws that hold the cover plate in
place, then remove the cover from the bay.

Removing the memory module cover
CAUTION: Static electricity can damage the memory module.
Before you handle the module, touch a grounded metal
surface to discharge any static electricity you may have built
up.

To avoid damaging the memory module, be careful not to
touch its pin connector on the side you insert into the
computer.

6 Remove the new memory module from its antistatic
packaging.

7 Insert the memory module in the slot and gently press it down
into place.

The clips on either side of the module will click to secure the
module.

Inserting the memory module into the slot

8 Replace the cover plate and the screws.

9 Turn the computer over and restart it.

When you turn on the computer, it automatically recognizes
the additional memory.

Removing a memory module
If you need to remove a memory module:

1 Complete steps 1–6 in “Installing a memory module” to shut
down the computer and open the memory module cover.
2 Pull the clips away from the memory module.
The memory module pops partially out of the slot.

Adding memory
Pulling the clips away from the memory module
3 Carefully remove the module from the slot.
4 Replace the cover plate and screws.
5 Turn the computer over and restart it.

the memory is dual channel, so you have to use matched memory for it to work 1gig in each slot if possible, check the 1 gigs and 512's to see if they run at the same bus speed, if they are not matched there is your problem try a gig and a 512 in slot 0 to see if it picks the memory up, also there is sometimes an option in the bios to dissable dual mode

you got the DDR 2 RAM right? and wont boot you say means you don have even the power on in the CPU or no display?

The other memory may be soldered in. Check your manual and see if it has any information on additional memory. If you only have on expansion slot you may have to buy larger memory chips. like instead of 2 chips 1 gig each you may have to purchase a 2 gig chip. Computer companies usually make the chip installation easy to get to on lap tops.