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I have a HP Pavilion dv5 1080eh laptop http://h10025.www1.hp.com/ewfrf/wc/product?cc=us&destPage=product&lc=en&product=3767387&tmp_docname=

I have 2GB DDR2 RAM in it. I want to upgrade my RAM: (2 slots)

  • Plan 1: Buy another 2GB DDR2 RAM
  • Plan 2: Buy a 4GB DDR2 RAM
  • Plan 3: Buy 2X2GB DDR3 RAM
  • Plan 4: Buy a 4GB DDR3 RAM
  • Plan X: ???

DDR3 RAM is cheaper somehow. Is Plan 3,4 possible? Could it work with DDR3 RAM? Which is the best option, 1X4GB or 2X2GB? What do you think?

I wrote an email to HP, but they didn't answer. Do you know where should I ask this question to be answered by someone who absolutly knows the answer?

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closed as off-topic by Mokubai, Dave M, mpy, gronostaj, Breakthrough Aug 26 '13 at 13:18

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1  
crucial.com/uk/store/… –  Mokubai Aug 20 '13 at 20:50
1  
DDR3 will not work with your system it cannot be used not be installed in your system if you do "install DDR3 modules" you will damage your system. If you do purchase anything purchase DDR2 laptop memory and nothing else –  Ramhound Aug 20 '13 at 21:05
    
If you want to save some money given the cost of new DDR2 RAM, and be green at the same time, I'd have a look on a well known auction site. RAM is one of the better computer components for buying second hand and couple of 2GB modules should be relatively cheap. –  archery1234 Aug 20 '13 at 21:59

2 Answers 2

up vote 2 down vote accepted

Welcome to SuperUser. DDR3 is cheaper because it is manufactured on a much larger scale than DDR2. Many companies are manufacturing DDR3 right now but only a few still make new DDR2.

Unfortunately DDR3 will not work in your laptop, it is not backwards compatible with DDR2 and has different layouts, see below.

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From Wikipedia

Plan 1 or 2 should work depending on how much money you want to spend and how much RAM you want.

Another thing to keep in mind is that if you are running a 32bit operating system it will only be able to use a max of 4GB of RAM. So if your operating system is 32bit then plan 1 is definitely your best option.

If you do go with plan 1 or plan 2 try to get matching RAM, sometimes manufactures don't always play nice and it's safer to get matching sticks. So if you buy 1 more stick, try to make it match what you already have, if you buy 2 new sticks, make sure they are the same.

Good luck!

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Thanks for the answer. I'm using a 64bit OS. I'm thinking of buying a 4GB DDR2 RAM (next to the 2GB) Is it risky? (because they will be not the same model...) Is it ok if the MHz.s are the same? –  tamas.pflanzner Aug 21 '13 at 13:02

No, DDR3 and DDR2 are not compatible.

From wikipedia

DDR3 SDRAM is neither forward nor backward compatible with any earlier type of random access memory (RAM) due to different signaling voltages, timings, and other factors.

Unfortunately you will need to stick with DDR2

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