Ram Ddr

April 1st, 2014

Can I use both a 512MB RAM DDR card and a 1GB RAM DDR card together on my my PC?

Or do both cards have to have the same RAM value (i.e. both 512 MB or both 1 GB). I am asking because at present I have one 512 MB RAM DDR and was thinking of buying a another 1GB one instead of one 512MB card, so I can have 1,5 GB of RAM.
Also, I have two blue slots and two black ones, which ones should I use?

It will most likely work, but you will suffer a speed penalty.

If you want to avoid the penalty, buy a 512MB stick and a 1GB stick. Put the two 512MB sticks on the same channel, so you will have 1GB on each channel.

Actually, it's probably best to just buy two 1GB sticks. That way, they'll be matched, and you'll have the same amount of RAM on each channel. (You should definitely do this if the new RAM is cheap and faster than your old RAM.)

If you have a blue slot and a black slot next to each other, then a space, and a blue slot and a black slot next to each other, like this:

blue black space blue black
or
black blue space black blue

The each channel has one black slot and one blue slot. Best ways to populate them are:

Best: 1GB empty 1GB empty
or empty 1GB empty 1GB (whichever fits best)
Note matched channels.

Good: 1GB empty 512MB 512MB (1GB on each channel)
or empty 1GB 512MB 512MB
or 512MB 512MB 1GB empty
or 512MB 512MB empty 1GB
Almost matched channels.

Okay: 1GB empty 512MB empty (1GB/512MB on channels)
or empty 1GB empty 512MB
Mismatched channels, but both channels in use.

Okay: 1GB empty empty empty (only one channel used)
Only one channel used.

Bad: 1GB 512MB empty empty (only one channel used)
Channel overloaded.

Bad: 1GB 1GB empty empty (only one channel used)
Channel overloaded.

This assumes your motherboard is typical.

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