Found 30th Sep 2009
Please help I'm sooooooooooooo confused.

I have a Toshiba Equium A100-02L Laptop.
It currently has 1GB of memory.
I can find out it's DDR2 533Mhz.

I want to upgrade to 4GB of memory but which one PC2-4200 or PC2-5300 or PC2-6400?
I've read that I could use a higher Mhz and it would still work.
I've searched and can't find an answer.

The toshiba website is confusing as it doesn't list A100-02L and when I input other codes off the back of my computer it bring up a different model with 60GB hard drive and mine is 120GB.

Thanks in advance for any help received.

17 Comments

Do a scan here to find which type of RAM you need: crucial.com/uk/

Original Poster

Spriggan;6443924

Do a scan here to find which type of RAM you need: … Do a scan here to find which type of RAM you need: http://www.crucial.com/uk/



Thanks I've tried that and it say's "Each memory slot can hold DDR2 PC2-5300 with a maximum of 2GB per slot" and there are 2 slots.
So I can assume that this website information is correct.

remember 32bit windows can only use 3gb of RAM.

Original Poster

mattbisme;6444036

remember 32bit windows can only use 3gb of RAM.



Mmmmmmmmmmm forgot about that.

Does that mean I could get a 2gb and a 1gb then?

Original Poster

dcx_badass;6444461

Yeah, if it's vista though it will work with 4GB just can't use it all … Yeah, if it's vista though it will work with 4GB just can't use it all unless you get the 64bit version, but you might find 2*2GB isn't much of a price increase from a 1GB and a 2GB anyway.



I'm just searching for the best prices now and will see what difference it makes.

eland59;6444021

Thanks I've tried that and it say's "Each memory slot can hold DDR2 … Thanks I've tried that and it say's "Each memory slot can hold DDR2 PC2-5300 with a maximum of 2GB per slot" and there are 2 slots.So I can assume that this website information is correct.



so you should get 2gb + 1gb PC2-5300 or 2gb + 2gb PC2-5300. If you are unsure then you should pay the premium and buy from a reputable store that allows you to return the ram if its unsuitable. I think the crucial store lets you do that.

I normally visit crucial to checkout what type of memory fits the device ,then visit playdotcom as they normally have some memory deals.
i've just checked for yours :

Laptop Memory / 2GB / PC2-5300 / DDR2 / 200pin / SODIMM
In stock | Usually dispatched within 24 hours
£24.99
Free Delivery

how does that compare to crucial prices ??

crucial is a good company. i wouldnt get a 2 and a 1, your modules should be in matching pairs for best results. 32 but systems will use 4gb, but usually~o.5 gb is reserved for hardaware, you can change these settings in the BIOS in most modern systems so that the full 4gb is available for the software

Original Poster

ricko;6445098

I normally visit crucial to checkout what type of memory fits the device … I normally visit crucial to checkout what type of memory fits the device ,then visit playdotcom as they normally have some memory deals.i've just checked for yours :Laptop Memory / 2GB / PC2-5300 / DDR2 / 200pin / SODIMMIn stock | Usually dispatched within 24 hours£24.99Free Deliveryhow does that compare to crucial prices ??



Crucial prices are
1gb - £13.79
2gb - £26.44
therefore
3gb - £40.23
4gb - £52.88

DDTTAA;6445371

crucial is a good company. i wouldnt get a 2 and a 1, your modules should … crucial is a good company. i wouldnt get a 2 and a 1, your modules should be in matching pairs for best results. 32 but systems will use 4gb, but usually~o.5 gb is reserved for hardaware, you can change these settings in the BIOS in most modern systems so that the full 4gb is available for the software



You cannot set the BIOS to allow Windows software to access all 4GB RAM. The problem is that device drivers require some RAM of their own. Since 4GB is the maximum addressable by 32 bit, the drivers cannot remap addressable memory beyond the 4GB. Windows must remap some memory within the 4GB to allow device drivers to access it which in many cases vary between 0.5GB and 0.75GB depending on the amount of hardware devices installed.

For the OP,

The speed of memory access is governed by the communication bus speed between the CPU and the RAM. For those who are interested, this is the FSB for Intel processors, and HyperTransport for AMD processors. If you install faster memory than the speed of the FSB or Hypertransport, the PC will still work but will not run at the memory's rated speed. If an Intel's FSB speed is 133MHz, then your memory will run at 533 Mhz (since Intel processors are 4x pumped and 4x 133 is 533 - OK not quite but that's how it works). A similar argument applies for AMD processors, as they are multi-pumped too. Again for those who are interested, when I talk about multi-pumped, it means on a bus of a certain speed, multiple bytes of data are sent at the same time for each clock cycle. Consequently, Intel processors send 4 times the amount of information for every clock cycle on a 133 MHz bus to the memory (not including the Core i5 and Core i7). I cannot temember the figures for AMD processors, but it is a more efficient method for AMD (and Intel Core i5/i7).

In essence, if the max rated speed of memory that your computer can use is 533MHz, then if you install faster memory, it will still only run at 533 Mhz. If you install slower memory than 533 Mhz, then it will run at its rated speed.

Crucial.com's memory checker is not 100% correct, by the way. It sometimes have problems distinguishing between single density and double density memory. Fitting single density memory to a board that requires double density memory causes half the RAM to be recognised. Explaining the reasoning for this will take me the whole night.

Oh installing paired memory is a prudent choice in order to take advantage of dual channel.

Original Poster

If crucial aren't always reliable would I be best opening up my laptop and checking first

eland59;6445909

If crucial aren't always reliable would I be best opening up my laptop … If crucial aren't always reliable would I be best opening up my laptop and checking first



Crucial gives a very good guide but not 100% correct. That's what I was saying. Your laptop's user guide will provide the relevant details.

Banned

get 4gb as im sure you may want to upgrade to windows 7 from vista in the near future

Original Poster

ElliottC;6446011

Crucial gives a very good guide but not 100% correct. That's what I was … Crucial gives a very good guide but not 100% correct. That's what I was saying. Your laptop's user guide will provide the relevant details.



I can't find laptop guide and on toshiba website its not my model that comes up

ElliottC;6445556

You cannot set the BIOS to allow Windows software to access all 4GB RAM. … You cannot set the BIOS to allow Windows software to access all 4GB RAM. The problem is that device drivers require some RAM of their own. Since 4GB is the maximum addressable by 32 bit, the drivers cannot remap addressable memory beyond the 4GB. Windows must remap some memory within the 4GB to allow device drivers to access it which in many cases vary between 0.5GB and 0.75GB depending on the amount of hardware devices installed.



yes, sorry, i was a little drunk when i wrote that and had convinced myself i was right.

eland59;6446342

I can't find laptop guide and on toshiba website its not my model that … I can't find laptop guide and on toshiba website its not my model that comes up



OK, I will have a look for you tonight. Standard PC2-5300 should be fine but some boards will insist on dual density rather than single density RAM which Crucial.com's scanner does not always get right.

eland59;6446342

I can't find laptop guide and on toshiba website its not my model that … I can't find laptop guide and on toshiba website its not my model that comes up



There are no issues with any type of DDR2-667 or PC2-5300 RAM on your computer. The board on your computer is modern enough to handle high density memory without any problem.
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