Buying the correct RAM

uponthegad

I just bought a Thinkpad E520 and deliberately only got 2gb of RAM as it was 75 euro for an extra 4gb. I have done some research but maybe someone can clarify some doubts I have.

Firstly, can I put in a 4gb stick to make 6gb or is there any issues with this? Would buying another 2gb be a better idea? My budget doesn't stretch to buying 2x4gb. I read somewhere that 64bit systems need 2 sticks of the same size to run properly but that said, you can buy systems with 6gb everywhere...

Secondly, assuming a 4gb is the way to go, when I search for compatible Ram on crucial.com I get the following options, please help:


4GB
DDR3 PC3-10600 • CL=9 • Unbuffered • NON-ECC • DDR3-1333 • 1.5V • 512Meg x 64 • • Part #: CT2134100

4GB
DDR3 PC3-10600 • CL=9 • Unbuffered • NON-ECC • DDR3-1333 • 1.35V • 512Meg x 64 • • Part #: CT2158741

4GB
DDR3 PC3-12800 • CL=11 • Unbuffered • NON-ECC • DDR3-1600 • 1.5V • • Part #: CT2134122

4GB
DDR3 PC3-12800 • CL=11 • Unbuffered • NON-ECC • DDR3-1600 • 1.35V • • Part #: CT2293896


And this is what's in the laptop out of the box:
(from the Lenovo website: "The use of 1066 MHz SO DIMM memory is recommended for this system.")
why are they recommending 1066Mhz when the system seems to have 1333Mhz?



any advice really appreciated.

deconduo

What's your budget? You can get an 8GB kit for €40:
http://www.memoryc.ie/products/description/8GB_G_Skill_DDR3_PC3_10666_CL9_SQ_Series_Dual_channel_laptop_memory_kit-2x4GB_/index.html

Is it a single 2GB stick at the moment or is it 2x1GB? If its just a single 2GB stick you could add a second one for €12:
http://www.memoryc.ie/products/description/2GB_G_Skill_DDR3_PC3_10666_CL9_SQ_Series_single_laptop_memory_module/index.html

uponthegad

deconduo wrote: »

What's your budget? You can get an 8GB kit for €40:
http://www.memoryc.ie/products/description/8GB_G_Skill_DDR3_PC3_10666_CL9_SQ_Series_Dual_channel_laptop_memory_kit-2x4GB_/index.html

thanks for that site, will def buy from an irish one.

Is it a single 2GB stick at the moment or is it 2x1GB? If its just a single 2GB stick you could add a second one for €12:
http://www.memoryc.ie/products/description/2GB_G_Skill_DDR3_PC3_10666_CL9_SQ_Series_single_laptop_memory_module/index.html

Its 1x2gb ..... didn't really want to spend more than €20, and 6gb should be enough for my needs, although I am tempted to go to 8gb. It really struggles with just 2gb!