Alternative programs to Memtest?

Memtest86+ is the best and easy to use.
http://www.memtest.org/#downiso
Download a bootable iso image
Burn the iso to disc
Boot from the cd
test one stick at a time

CDMemtest86+ is directly executable by any modern x86 compatible machine,
by writing the iso to a CD one can boot from the CD to run memtest.

Simply download the appropriate package, the Download - Pre-Compiled
Bootable ISO (.gz) for Linux users and the Pre-Compiled Bootable ISO
(.zip) for Windows users.

For Windows, unzip the package into a directory like C:\memtest. You will
now see a file called memtest86+-1.xx.iso in this directory. You will
need to burn this file to a CD with a CD recording program. Do note
however that you should not make a regular data CD on which you for
instance write your text documents and holiday photographs. Instead the
iso file is a so called image of a CD, it is a direct copy of a CD. Your
CD recording program will most likely have a feature called burn image or
something to that effect which you should use to burn the CD. Do NOT under
any circumstances select to create a bootable CD. The memtest ISO image is
already bootable. You need NOT create a new CD, you need to burn a CD
image. Usually you can simply double click the iso file in the Windows
explorer which will start your CD burning application and prompt you to
burn the CD.

For unix, unzip the package into your home directory. and execute
'cdrecord dev=<your burner> ~/memtest86+-1.xx.iso' where you replace
<your burner> with the scsi address of your CD burner and replace 1.xx
with the correct version number of the memtest86+ you downloaded.

When the burning is completed your drive will most likely have ejected the
CD and you should have a bootable memtest86+ CD. To run the test directly
reinsert the CD and reboot your machine.

Your machine should now boot from the CD, display the word Loading
folowed by a series of periods and then show a screen much like the
screenshots on the memtest86+ web page. The test is automatically
started.