I currently have 256 DDR 133mhz of memory.
I would like to double that by buying another 256.

But i can only find 256 DDR 256mhz. Does anybody know if this will work with my 133mhz existing memory? I can't seem to find out from anybody if you can mix the MHZ about?

Thanks in advance,
Dean

i think i have read in other posts that if you run 2 speeds of ram they will run at the slower speed.

Oh, well i don't mind that.

As long as they both work together, its still going to be a hell of a lot faster then i have now.

Don't want to hold you to anything, but do you reckon then as long as the memory chip is compatible, it will run along with my different MHZ?

Thanks for your help,
Dean

Where your problem will come in is with the latency. You can use CPU-Z or a utility like it to give you the latency or timing of the memory module you already have installed. Try to make the latencies match up. However, as inexpensive as memory has become, why don't you buy the size module that you want to install and save yourself some grief.

Sampson:

So what you mean is instead of buying an extra 256megs, buy 512 megs and ditch my existing 256megs?

And i suppose, just out of interested, would it hurt to then try the 512 with my existing 256? If it doesn't work then i've got nothing to lose have i, i'll just then remove the 256 and continue with my new 512.

Oh yeah, does something happen on screen when i boot up after theres extra memory been installed? And if i try mixing them like i mentioned just now, they won't blow my laptop up will they if it doesn't like the two different MHZ???!!!

Thanks a million,
Dean

The following link is the existing memory that i have now, accept mine is 133mhz

http://partsurfer.hp.com/cgi-bin/spi/showphoto?partnumber=285272-001


And this next link is what i wanted to upgrade to.

http://inet.se/produkter_info.asp?p=5302510


Do you think they will be compatible what any hassles?

Hi Dean,
You Can mix DDR all day long. It was PC66-133 that some motherboards/CPU combinations couldn't handle. Don't waste your time with such a pointless upgrade as 256+256 unless that's really all you can afford. Get 512 or 1GB whichever strikes you as economical. A lot of the time the 512 will be ~100 and the 1GB will cost ~270 so in that case it makes more sense to get two 512s and sell your old DIMM. Also did you try the crucial memory configurator? It's quite usefull though not 100% accurate (nor is anything else out there
HTTP://www.Crucial.com. Just select your systems make and model or go by motherboard manufacturer if you built it yourself.
Cheers,
Christian Blackburn

Uh... I can't believe no one seems to know this but there is no such thing as DDR 133MHz (at least I have never in my life heard of it). The DDR you have runs at 133MHz, however DDR stands for Double Data Rate, which means that the data rate of 133 MHz is doubled to equal 266 MHz. If you say your memory is 133 MHz, make sure it is not regular SDRAM, instead of DDR SDRAM. The best way to check this is not to look at the memory you have, but to find out what is compatible with your motherboard by going to the its website.

But... if I were you I would just get 512 MB or 1 GB and dump the 256 MB because memory runs better when all the modules are exactly the same (mostly because of CAS speeds).

Uh... I can't believe no one seems to know this but there is no such thing as DDR 133MHz (at least I have never in my life heard of it). The DDR you have runs at 133MHz, however DDR stands for Double Data Rate, which means that the data rate of 133 MHz is doubled to equal 266 MHz. If you say your memory is 133 MHz, make sure it is not regular SDRAM, instead of DDR SDRAM. The best way to check this is not to look at the memory you have, but to find out what is compatible with your motherboard by going to the its website.

But... if I were you I would just get 512 MB or 1 GB and dump the 256 MB because memory runs better when all the modules are exactly the same (mostly because of CAS speeds).

Christianb: I did have a look at crucial thanks. And it has helped me a lot to understand a couple of things. I would ditch my 256 and just get 512, but the 512 is more than double in price than the 256!!! That is so weied isn't it? Just like you mentioned though that it sometimes is like that. I guess i could just buy 2x256 though.

jdemitro: My memory module definitly says on it '256 DDR 133mhz'. So i don't know whats going on there. And like you said > You've never heard of DDR being 133mhz, so i guess thats why everyone is possibly confused in shops when i show them it!

Thanks for all you help everyone!

Dean

Found out with the CPU-Z Freeware utility that i have 'DDR-SDRAM'

Can someone please let me know if 'SODIMM DDR-RAM' will work along with the 'DDR-SDRAM'???????????????????

Dean

Okay that was a dumb question i guess up there on my last post!

Of course they will work to together i guess, i mean they're identical apart from one is 'DDR-SDRAM' and the other is 'DDR-RAM'.

What is the difference anyway?

Dean