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Memory Issue

kazmcj Avatar
8y, 8m agoPosted 8 years, 8 months ago
Hi just a quick question.

Computer has DDR memory. There are four slots (2 green & 2 purple)

Have a 1gb crucial PC2700 that I would like to put in instead of the 2 x 256mb already installed. Have checked on crucial website and it is compatible (recommends pairs but says it will support just one stick)

My question is, if i take the 2 matching pairs out and replace with the 1gb stick (till I can get a second matching stick) which slot do I need to put it in ( green or purple)

Any advice would be much appreciated.
kazmcj Avatar
8y, 8m agoPosted 8 years, 8 months ago

All Comments

(16) Jump to unreadPost a comment
do whatever it instructed on crucial, or try both and see
You should always pair up memory so if you want 1gb get 2 x 512mb or buy 2 x 1gb.

I just had a spare from another computer and thought I could put that in for now and order another on Tuesday. Just thought a single one stick of 1gb would be better than two sticks that only equal 512mb.

Thanks for the advice.

If I buy another Igb of crucial that is the same as the one I have will that be classed as matching?

Do they need to go in the green or purple slots?

Didn't see a bit on crucial that told you which slots to put them in?
Don't know about the green and purple. are you sure they are your memory slots and not something else.

If your motherboard supports single modules then leave the original pair in place and simply add the the extra 1Gig. Your motherboard info will tell you whether it must be installed in pairs or not. The days when it was necessary have long passed, so read up first. There's no harm in trying, just add the extra stick, if the computer recognises it on boot up then your up and running with what you've got, no need to spend more money.
Your PC manual should tell you which slots to place them in otherwise put both in either green or purple then boot up and if OK the PC will recognise the new memory.

I honestly dont think it matters which you put it in.
Seriously wouldnt try mixing different types of memory from different batches, many modern motherboards will try to "dual channel" them and a miniscule difference in fabrication will make a lot of difference.
Result would generally be a lots of bsods or it can sit there for a month then trash your hard drive on a whim.
Use 1 single stick or buy special dual channeling memory, not all main-boards can handle anything else.
Thanks allx

Added the extra ram but was slightly confused because I went on crucial scan and it said I had none installed!

( even though the computer itself has recognised the 1.5 mb)

Had a few problems with pc lately and have only recently put in a new graphics card because it kept crashing. It' was working fine again but today got a blue screen and it just kept rebooting.

Thought maybe it was because of the ram.
Thanks maddog, I will just put the 1 gb in then and leave it at that and see what happens. So it doesn't mattter if I put it in the green slots or purple (haven't got the manual anymore)
there are a few mainboards that take both ddr1 and ddr2 and as they use the same voltage line both types should not be used simultaneously.
I've actually tried to fit a ddr2 in a ddr slot (for testing purposes of course ;))and they don't go in without using a hammer so little chance of them getting mixed
so just use whichever fits again depends on mainboard but if one actually boots u should be ok from there
The colours probably refer to the dual channel aspect of the motherboard, to enable dual channel memory you normally have to put the memory into the slots in a certain configuration. Unfortunately it varies between chipsets and motherboard vendors so there's no definitive advice.

If you are taking out the memory and only putting the 1GB in, you're best to put ram into the very first slot which is usually labelled DIMM0 (or possibly 1). If you're going to run all three memory sticks together then it doesn't really matter which coloured slots you're using as you can't have a dual channel memory configuration with those types.

You should always pair up memory so if you want 1gb get 2 x 512mb or buy 2 x 1gb.


Why? Something like RDRAM has to be paired to work but DDR doesn't. One stick or three identical sticks shouldn't cause any problem.

If you are taking out the memory and only putting the 1GB in, you're best to put ram into the very first slot which is usually labelled DIMM0 (or possibly 1).

Yeah, this is good advice, the RAM slots should have labels by them on the motherboard. DIMM0, or Bank 0 or similar.

The coloured slots will only be demystified either by looking at the motherboard manual (the motherboard should have a model number on it and lots of manufactuers have the manuals availible to download on their websites), or possibly by text next to the ram slots.
The way "Windows" works and handles memmory you should always pair up ;-)

Trust me, I worked as a network amin for 12 years.
The way "Windows" works and handles memmory you should always pair up ;-)

Trust me, I worked as a network amin for 12 years.

As a field engineer for 15yrs i would say never pair memory unless u know exactly what you are dealing with.
I think the problem here is how people are defining "pairing"

I found out it is Micro Star motherboard MS-7091.

Looked up the manual and have put the 2 sticks in Dimm1 and Dimm3 (has 4 slots dimm1 -4).
The two sticks of ram are the same (paired?) as they are original to the computer.

The computer starts up and seems fine for now. When I go to system properties it says there are 512mb.

Went back to crucial online scanner and I still won't recognise the ram. It just says I have four slots avaiable.
(also tried kingston and says the same)

Run an everest report and the memory shows up under SPD memory.

When I boot up the computer it flashes up with the graphics cards ram and then boots as normal.

Completely lost now, I don't know if the ram is any good or not.
if fitted originally they will be a "matched pair", never used this particular board and will defer to any that have, but if it was my machine i would either
a. put up with the 2 x 256
b. replace both sticks with the 1gb and test it thoroughly
c. bin the lot and buy a pair of matched 1gb sticks, pref a good brand, corsair,crucial,kingston etc
1 Like #16
Ignore the website, use this program to instead to make sure the memory is installed correctly and working:
Go to the "SPD" tab at the top, and then find the slot drop down box. Each slot should give a reading, if its empty it will tell you if its got some memory in it will tell you what it is and so on. Very simple.

I have download the manual for your motherboard and had a look at the memory set-up pages. If you want to use Dual Channel it has to be set-up like this:

Dimm 1 and 3 or Dimm 2 and 4 - with a pair of matched memory (2 sticks)
Dimm 1, 2, 3 and 4 - with four sticks of matched memory (read below for more about this set-up)

Any other set-up will default to Single Channel. So you can put all the memory you have now into the machine. All you have to do is put the 1gb in Dimm1, and the two 256mb sticks in Dimm2 and Dimm3. Leaving Dimm 4 blank. The computer will know that Dimm1 and Dimm3 have different sized memory so will not operate Dual Channel and will go to Single Channel, which should get your running with 1.5GB of memory.

You can use all four dimms with two different sets of memory. For example if you wanted to use a 1gb matched pair and a 256mb matched pair this is possible. Dual Channel on your board runs as 2 separate channels. So you can set it up like this:

Dimm1: 1gb
Dimm2: 256mb
Dimm3: 1gb
Dimm4: 256mb

This will then run all the memory in Dual Channel mode. The two channels work separately not together, so all four dimms do not have to match, only the ones in the same channel.

I hope all that made sense lol

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