No,
keep the new stick to 533, you can go 666 or 667 but no higher.
it will work @ the lowes speed of all, and will be 15-25 % slower than matching speed.
It is not hard to install the 2GB DDR2 SO-DIMM in your Acer laptop.
The Acer Aspire 3620 Notebook computer can use DDR2 PC2-4200 (DDR2-533) or DDR2 PC2-5300 (DDR2-667) which are 200-pin SODIMM modules. The Acer Aspire 3620 has two memory slots and each slot supports up to 1 Gigabyte of RAM for a total of 2 Gigabytes. This system uses unbuffered, Non-ECC, 1.8 Volt RAM.
Yes, the 2GB DDR2 SO-DIMM is specifically for Acer laptops.
No, DDR and DDR2 are different types of memory. DDR2 supports higher speeds and has different socket. Check your laptop manufactore website to find out which type of memory your laptop works with.
so-dimms ddr2
http://www.crucial.com/ The website above has a way to find out what RAM your laptop needs. According to the site an Acer 3053WXCi needs DDR PC4200 or DDR PC5300
The Kingston memory 2 gb will fit the Acer models and many others as well.
Guessing DDR2
depending on the laptop, it could be DDR, DDR2 or DDR3. But the form factor is all the same. Its all SO-DIMM memory
no it will degrade your system
The Acer Aspire 5100 notebook used the 553 MHz or 667 MHz DDR2 SDRAM technology. Its maximum memory capacity was 4GB but one was able to expand it by installing 2 SODIMM modules.
The Dell Latitude D610 comes standard with 1GB of DDR2 RAM but is upgradable to a more robust 2GB.