The minimum requirement for RAM to run windows 7 is 1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit).
Lenovo Ideapad Z580 (59-333620) Laptop (3rd Gen Ci3/ 4GB/ 500GB/ Win7 HB/ 1GB Graphics)
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Its depend upon the your purpose and idea. For what purpose you are going to buy laptop. gaming and business laptop need high RAM.
The RAM that is used for a laptop is not the same as the RAM that you would use in a desktop PC. The RAM that is used for a PC is much too big to be used in a laptop, so a laptop has to use a much smaller RAM card which is called SD-RAM.
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The laptop in question comes with 4GB of RAM.
Win7 Ultimte only adds multi-languages and Bitlocker. And that is it. That can be confirmed on the MS Win7 page. So unless you need those two features, Pro is what you require.
The Compaq V5000 laptop comes with only 1 gigabyte of RAM. You could play games on it but it wouldn't be fast. You would need to upgrade the laptop with RAM for it to be faster for games.
If you are talking about RAM... I saw one customized laptop with 16 Gb of RAM. If you are talking about certain model then you need to check the manufacture's website.
Based on the details that you have provided that laptop is between 100 and 150 US dollars.
You need to put the proper RAM in place. Otherwise it will not be detected no matter what. It is a SODIMM, maximum 128MB.