PC Hardware

General discussion

Should I disable PAE?

by saitokokeimei / December 9, 2008 9:17 AM PST

I am using Win XP SP2 with 2 GB of RAM and a 3000MB pagefile set.

My questions:

Is PAE/DEP hurting my performance? Should I disable it?

I know PAE is to allow greater than 4GB of memory, but does my pagefile count toward that? Do I have to have PAE enabled with my combination of 2GB RAM and 3GB pagefile?

Is my pagefile set to a good size for my RAM? Should I lower it so I can disable PAE?

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DEP
by mementh / December 9, 2008 1:57 PM PST
In reply to: Should I disable PAE?

dep = data execution prevention

LEAVE IT ON!!!!!!!

again repeate

*LEAVE* *IT* *ON* *!* *!* *!* *!* *!*

it trys to prevent things from running code in memory space which is the source of buffer overruns.

check out security now from leo laporte and steve gibson http://twit.tv/sn they did a episode or so about it

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pagefile.
by cyxapebpek / December 9, 2008 2:20 PM PST
In reply to: Should I disable PAE?

About the page file, its not actually an addition to your RAM but a superset of it so with 3GB page file you have a total 3GB system memory not 5GB.

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k
by saitokokeimei / December 11, 2008 5:07 AM PST
In reply to: pagefile.

K. I knew what pagefiling was versus RAM, but when googling and looking through discussion forums, some people seemed convinced that pagefile space would still have to count as the max memory namespace of 4GB on Win XP 32 bit. Makes sense.... if Windows can only register and address 4GB of memory, it seems like that would include pagefiles also.

Also, my brother was debating upgrading his ram. he has 2 gb of ram, 1gb on his gfx card, and vista premium 32 bit, and I wasn't sure exactly how much memory he could use. I've read from several locations that his gfx card would count toward the max memory. I've also read that with PAE, although it extends the memory addresses, since it still limits 2GB per application, you can only hit 4GB or more if you have a large enough pagefile.

It's confusing to me though because I've read it from so many different people.

I thought DEP was more of an antiviral thing than a memory flow thing. Microsoft says it will cause a performance decrease when enabled, and I've also seen proof that using PAE causes processes to use more memory than usual (from 16kb to 28kb before-and-after PAE), but since it seems to be enabled by default for anything past SP2 WinXP, and everyone is using it, I'm not worried about it.

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