help:upgrade ram for laptop

my laptop come with 512MBx1 ddr2 533 pc2 4200... could i put it toghether 1gb ddr2 667 pc2 5300 to make it 1.5gb...or both of them have to compatible speed at 533 or 667? my laptop has ram with speed 533.... does it mean my lappy only support for dat speed? i duno much about laptop's ram... any help would be appreciate.

 

We need more info on your laptop, specifically the chipset, if it uses the intel 945, you can use 533 or 667, a combination would have both sticks running at the lowest speed, and yes 1.5 gb would work with dual channel support.

 

i'm in the same situation
My chip is Core Duo 1,73Ghz,512 DDR 533
I intend to buy another 1G,but what bus should I buy,if i buy 533,in the future (may be next year) 667 wiil be cheaper,and this is a waste.However 667 at this moment is a useless if it's combined w/ 533

 

well, If you have about ~$220 I hear that newegg is selling OCZ 1GB sticks for 100 plus MIR which will be about ~$90 a stick.

 

Laptop components need to communicate with each other at the same frequency. So, your laptop will only run as fast as the slowest component. It depends on the frequency of your chipset, and the speed of your processor FSB. If you computer can handle 667Mhz RAM, then you should go for it. However, if you put 667Mhz RAM in a computer that runs at 533mhz, the PC will only run at 553Mhz, and the extra frenquency rating you paid for will be wasted.

To get the full adavantage of the current speed of RAM (667Mhz) then both need to be 667Mhz if your running on Dual channel RAM.

With the Santa Rosa platform coming out, with CPU FSB Frequencies of 880Mhz, its not worth worrying about the RAM Frequency.

How much benefit you will gain from buying more RAM, and of a higher frequency depends on what spec you laptop is, and what application you run on your PC.

 

umm.... my lappy has core duo 1.7 come with 512mb 533 ....should i upgrade it to 1.5 at 533 or 1gb at 667.....which is better? at 667 does the speed improve alot than 533? any recommend would appreciate.

 

I actually have a question about aftermarket RAM too ...

Does the RAM have to be from the same manufacturer? Or, does it just have to be the same frequency? For instance, if I have 1 GB Corsair 667 Mhz DDR2 module (1.8V, CAS latency 5 blah blah), and I put in, say, a 1 GB stick of OCZ 667 Mhz DDR2, will the computer recognize both sticks and run them in dual channel?

 

While it's not recommended to run different brands in parallel due to subtle differences in manufacturing, it will do just fine.

Also, when choosing between 533 and 667, go with the cheapest solution due to similar RAM manufacturing reasons.

 

What is the make/model of the laptop - If you mix DDR2 533/667 the RAM will run @ 533, so having the 667 is pointless - and possibly may not work depending on CL, voltage and timings - also that would probably take away dual channel.

 

umm... it was toshiba satellie A105 series

 

how i know what chipset support dual channel,can i see it in Cpu-Z
my friend guy is using T60,he added 1g compared to another 512Mb, and he said he don't know does his rams run in dual channel

 

Dual Channel just means that you put modules of RAM in two slots, instead of running on one module of RAM. If you've got more than one RAM slot on your motherboard, then your laptop supports Dual Channel RAM.

Dual channel-enabled RAM controllers use two 64-bit channels, resulting in a total bandwidth of 128-bits, to increase the bandwith to move data from RAM to the CPU.