What does it mean when they say 64x64 when referring to ram?

[Shawn]

see title

 

[Matthias99]

I'm sure a search would turn this up... but it refers to the layout of the individual memory chips on the DIMMs. "64x64" modules (IIRC) use 64 chips of 64Mb (8MB) each, so that should be a 512MB DIMM. This makes no difference in terms of performance.

With DDR SDRAM (as well as DDR2/3), all memory controllers should support any density memory; with older types of memory, sometimes they only supported modules that used up to a certain number of chips. That's why some older desktops and laptops require 'low-density' memory.

 

[Shawn]

Well the reason I ask is because I am adding 512MB of SDRAM to my laptop which does not "officially" support 512mb. However someone had success with the following: (512MB, SODIMM, PC133 64Meg x 64, 144 Pin, 3.3v, CL=3). Would 64x64 be low density or high density?

 

[Matthias99]

Originally posted by: Shawn
Well the reason I ask is because I am adding 512MB of SDRAM to my laptop which does not "officially" support 512mb. However someone had success with the following: (512MB, SODIMM, PC133 64Meg x 64, 144 Pin, 3.3v, CL=3). Would 64x64 be low density or high density?

That should technically be 'low-density', but a lot of older motherboards may have trouble with it anyway, since they were built long before 512MB DIMMs were around.

Check your laptop model at Crucial's website (www.crucial.com). Their database is pretty reliable in terms of what memory your system can use.