32 bit linux like Ubuntu can support maximum how many GB memory?
How about 64 bit?

My machine only has 2GB DDR2 memory.

This has already been answered in your other thread about architecture:
http://www.linuxquestions.org/questi...-linux-856449/

memory support same as windows?

So, not only do you already have a thread on this subject (have you actually understood johnsfine's contribution in particular?), but it is also irrelevant to you.

Ho, hum.

No it is not. You can use up to 4 GB (in fact it will not be more than 3.XX because of architecture design) with a standard Ubuntu 32 bit-kernel, this is the same as in Windows 32 bit. If you use Ubuntu's 32 bit server-kernel PAE is compiled in and it can address up to 64 GB of RAM. There is no such kernel in 32 bit Windows, they have PAE enabled but restrict the memory use to 4 GB. The 64 bit versions of Ubuntu's kernels have only a theoretically limit that can not be reached by normal desktop hardware in near future.
The Windows 64 bit kernels restrict memory use for marketing reasons. These are the supperted amounts of memory for Windows 7:

• Starter: 2 GB
• Home Basic: 8 GB
• Home Premium: 16 GB
• Professional, Enterprise and Ultimate: 192 GB

You can see the limits for other Windows versions here.

for x86, 32 bit all are limited to 4GB.
therefore, for advanced user, 64bit OS is needed

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You asked a question, apparently ignored all answers and then posted a summary of your intentionally incorrect view of the facts.

Was there a point to doing all that?

Plain wrong, not more. Seems that this was a test for your school and your teacher doesn't know about PAE.

I can't say that it was intentional -there could just be a difficulty in understanding- but it does seem to be this poster's Modus operandi. I suspect that the OP feels that he (or she) feels that (s)he has moved his/her understanding forward and wants the rest of the world to know the joyous news. That this new understanding is still inadequate hasn't in any way slowed the process down.

@TobiSGD
Probably not, if you assume that the poster's recent posting storm all comes from one cause, and that most school courses don't include the test 'Install as many unrelated Linux Distros as you can, and irritate forum members by posting irritating and meaningless comments about the various distros, including at least some incorrect statements'. Well, unless there is a 'Flamebait 101' these days, and for all I know, there may be.

the list shows 32bit windows7/vista all only support up to 4GB RAM

what is PAE?

i see, there is a way to walk around the limit.
anyway, if really want to use >4G RAM, 64 bit OS is still a better choice.

Just do a search for PAE or 32 vs 64 bit on this forums, and you will get a lot of different oppinions on this topic.