use 2gb memory card with 512 memory card?

Do a free scan at Crucial it will answer your question

http://www.crucial.com/

http://www.crucial.com/uk

wdw

If there are vacant slots for specific amounts of memory then that means the motherboard is designed to operate at the expected speed of the combined amount of memory.

For example, if you have 4 vacant slots and they were designed for either 512MB or 1GB each slot. Meaning, the motherboard is expected to operate at 2048MB or 4GB tops which is the limit.

Since 2GB is more than enough of RAM then you could discard the two 512MB memory sticks. Depending on you operating system (if it is Vista or XP), 2GB is already beyond the golden target which was 512MB. No matter how much multi-tasking you do and how much 3D effects your computer performs, I'm certain that memory consumption would not exceed 1GB yet. And that is everything from multi-tasking to 3D effects. The remaining 1GB is nothing.

Does your motherboard have 4 memory slots? If it only has 2 where the 512's are installed already, then chances are your motherboard capacity is only 2GB anyhow.

If it isn't, then you need to make sure the memory matches in the way of either being ECC or NON-ECC. You cannot mix the two. If all of the memory matches, then you can install them all together.

Likely, buying (2) 1GB sticks and installing them is your best bet since they will certainly be compatible with each other and is almost always cheaper than buying a 2GB stick.

The easiest way to find out what your limitations and possibilities are regarding RAM upgrades is to run the Crucial memory scan tools located here:

http://www.crucial.com/index.aspx?gclid=cntf7d6s1p...

Choosing to buy from them is a decision to make, but from my experience, spend the extra 10 bucks for good ram like Crucial RAM, and it will last you years, versus 10 months > then failing/causing errors.

Good luck.

Most modern computers run dual channel ram. So both chips may have to be the same to run at 128 bit. If they are different the computer will drop back to 64 bit and what ever the slowest ram chip is. So if say you have 400 mhz ram in there now and you put a 333 mhz chip in there they would both run at 333 mhz.

There is not a big difference between the 64 bit and 128 bit so i wouldnt worry too much about that. But if it was me i would get a 2 gig kit for it with two 1 gig memory chips. You wont notice a big difference between 1 gig and 1.5 gig. But you should notice a noticable difference between 1 gig and 2 gig.

Hi. If your RAM is running in dual mode then two non-identical sticks may slow things down a little bit. Can you use just the one 2GB RAM? The extra 512 doesn't add much.

It won't fry it, but it might not work while it's plugged in.

The first thing you need to do is check the specs on the motherboard to see what's the most ram you can upgrade to.

I also think you are supposed to match memory sizes, like 2gigs and 2gigs or 1 and 1 and so on, but I'm not 100% sure on that.

If you have 2 cards and 2 slots I think it should be fine. I doubt it would 'fry' anything, if you put it in and something doesn't work just take it back out and use your previous setup.

1 Gb usually San Disk has them for $40-50 at Best Buy

That all depends on what your computer can hold? It might be topped out at 1 gb.

At worst, the sticks won't be compatible, and you will get an error on bootup. It will not harm your pc.