memory ram

hi everyone
i have an acer 1691 and tomorrow i am going to buy some ram for my laptop i am gonna check some prices and decide if i buy a 1 gig or 512,the type of ram i have is 2700 and i have a couple of questions i want to ask here they are
-does my laptop support the ddr2 type?its a centrino 715 1.5 ghz with 400mhz fsb
-how can i know how many pins the ram of my laptop have or
is there any difference between them cause i saw in some sites there were 168 and other with more,my acer system information says it can support DIMM and SDRAM type.
-as i say my system info says the type of ram what if i bought a SODIMM it wont fit?
i would be greatly apreciated if someone can help me with those questions thanks a lot

 

-Nope - AMD processors do not support DDR2. Don't worry, there is not a huge difference in terms of performance between DDR and DDR2.

-DDR SO-DIMMs (for notebooks) has 200 pins. DDR2 has the same amount, but the placement of the pins on the memory stick is different, and therefore they won't fit into a DDR socket.

-Your notebook only supports DDR. SDRAM is the older technology, phased out a long time ago by DDR. DDR is, in its full name, is DDR SDRAM - that's where Acer got that from. A DIMM is another term for a RAM stick.

-If you buy the correct RAM for your notebook (DDR333, PC2700, 200-pin SO-DIMM), then you shouldn't have any problems. I recommend Kingston, Crucial, and Corsair memory - very well-known and reliable memory.

What tasks will you be performing with this notebook?

Congrats on the new machine BTW.

 

some video editing and a few games i have
so i have to go for a DIMM instead of a SODIMM or there is no diference betwenn them?
i think you are mistaken my processor is an intel centrino so can i get a ddr2?
thanks for the help

 

Laptops use SODIMM. Desktops use DIMM.
So you"ll need as Chazman posted 200 pin DDR SODIMM.

 

ok thank you both very much,thanks a lot for the help

 

Sorry - I thought I saw AMD in there. But, turns out that what I said applied anyway.

Cheers!

 

hi again i just bought two sticks of 512 it was 50 bucks each =) and i downloaded everest so i can see if they are running at the speed it supposed to be going at 333mhz but when i run the program it shows that my motherboard can handle the ddr2 the 400 and the 533 why is that? and another thing i just installed them and when i right click on my computer then properties it just appears that i have .99gb of ram why is that?
and in this program it shows that one memory ram is running at 166mhz and the other in 133mhz.They are kingston valueram sticks
it says
Field Value
Supported Memory Types DDR-333 SDRAM, DDR2-400 SDRAM, DDR2-533 SDRAM
or is there any other program better than this that i can try to see my speed

 

Well, if DDR works in your laptop, then there is no way DDR2 is going to work. They are not interchangable. Also Intels 800 series chipsets do not support DDR2 memory. Only their Sonoma based Pentium M's with 900 series chipsets support DDR2.

Everest even though it is a good program can be wrong at times. There is no way 2 memory sticks are going to run at different speeds when they are paired up. When 2 sticks are paired up, they usually run at the same speed as the slowest one. The reason Everest displayed the laptop supports might be due to the fact that newer 1691 based on the Sonoma platform do support DDR2.

CPU-Z is one of the best to see the major specifications on a system. I should give you the speeds at whoch your RAM is running. If the latest version does not display the RAM speed then try one of the older versions.

The 0.99GB is nothing to worry about. It is due to how Windows reports bits and bytes. Also sometimes, there are hardware which will take little amounts of memory to run stable. Sometimes the BIOS recognises and excludes them from reporting it, but in most cases it is displayed as it is. If you want to know the correct amount of memory, the best place is to check in the system BIOS.

 

great thanks a lot i make a mistake reading this program it was memory timings in a single stick ram there it displays the 133 and 166,thanks a lot for the help i can see a
big diference i just had some trouble with tha cover of the ram that was hard to open
THANKS A LOT

 

hi again i used the cpu-z and it says thast the memory frequency is 166mhz instead of the 333mhz that it supposed to be running how cn i change that to 333mhz,the two sticks are from the same brand and the same speed why does that happend?i mailed acer but i havent had any response on that.

 

What's 2x166? Approximately 333, right?

You have DDR memory...which stands for Double Data Rate. So it's transferring double the data across a 166Mhz bus on the memory, which equals a 333Mhz stream of data.

That's a simplified answer, but basically, your system is properly configured and you have nothing to worry about.