Memory upgrade on Toshiba Satellite L50-B-1NL

I bought the Toshiba Satellite L50-B-1NL from argos yesterday. It came with 4GB of RAM. I want to upgrade it to 8GB. Can anybody help with upgrading process. Also will upgrading the RAM void the warranty.
Regards
SD

Im not L50-B owner but I guess there is no separate access to the memory modules at the bottom of the unit.
Right?
In such case its necessary to remove the bottom plastic cover and this will definitely void the warranty!!!
If you want to keep the warranty valid, dont upgrade the RAM by yourself.
This must be done by authorized service engineer.

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Hi Webmonkey
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I own a Satellite a100-912 and I want to upgrade its memory!
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Hi!
The specs. you posted are correct. Xpress 200 could support dual channel: "Variants available with single or dual channel system memory support ". But there is nothing about dual channel mode in Xpress 200M specs. I have identical modules, but EVEREST doesn't say the modules are running in dual channel mode. So I think the info you found on the website gives the answer, but here are some explanation from Wikipedia to clarify the definitions:
*Dual-channel:*
"Dual-channel-enabled memory controllers utilize two 64-bit data channels, resulting in a total bandwidth of 128-bits, to move data from RAM to the CPU. In order to achieve this, two or more DDR/DDR2 SDRAM memory modules must be installed into matching banks, which are usually color coded on the motherboard. These separate channels allow each memory module access to the memory controller, increasing throughput bandwidth."
*DDR:*
"DDR SDRAM or double data rate synchronous dynamic random access memory is a class of memory integrated circuit used in computers. It achieves greater bandwidth than the preceding single data rate SDRAM by transferring data on the rising and falling edges of the clock signal (double pumped). Effectively, it doubles the transfer rate without increasing the frequency of the memory bus."
*DDR2:*
"Like DDR before it, DDR2 cells transfer data both on the rising and falling edge of the clock (a technique called "dual pumping"). The key difference between DDR and DDR2 is that in DDR2 the bus is clocked at twice the speed of the memory cells, so four words of data can be transferred per memory cell cycle. Thus, without speeding up the memory cells themselves, DDR2 can effectively operate at twice the bus speed of DDR."
*UMA (Unified Memory Architectrue):*
"In computer architecture, Shared Memory Architecture (SMA) refers to a design where the graphics chip does not have its own dedicated memory, and instead shares the main system RAM with the CPU and other components."
Message was edited by: Abe83

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Memory upgrade on Toshiba Satellite L50-B-1NL

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