How Can I Tell if I Have a Bad RAM Terminal?

A few weeks ago, my MacBook Pro started freezing several times a day, and it was to the point where I couldn't use it for even 10 minutes. It would also beep three times most of the time that it froze. So I turned it off for like 3 weeks and then took it in to the Genius Bar.
He ran some tests and said it was a RAM issue and I could buy new RAM chips (or whatever) and so I did, and when I installed two of them, my computer wouldn't start. I thought maybe the MHz was too big. I took one out, and the computer worked fine. For thirty minutes. Then BEEEEP beeeeeep BEEEEEP
I removed the one RAM and reseated it in the other terminal, and my computer has been working fine for most of the morning. I am running Chrome and playing youtube, Facebook, uploading pictures, and using iPhoto.
My MacBookPro came with 2 2GB RAMs (1333 MHz). The new RAMs are 2 4GB DDR3 OC3-10666 and compatible with 1333MHz and 1066MHz, according to the package.
The closest Apple store to me is more than an hour drive, and I'm wondering if there are any tests I can do at home. To me, an inexperienced computer repairwoman, it looks like I have a bad RAM terminal. Tonight I will reseat the RAM in the first terminal I tried, and see if it freezes and beeps again. It's possible that it was just seated incorrectly, perhaps?
Please send any and all advice, thoughts, questions, etc. Thank you!

As John Galt says, not all RAM is created equal. Crucial.com or MacSales.com (OWC) are well respected Mac RAM vendors.
Rember
<https://www.macupdate.com/app/mac/15837/rember/>
is a wrapper around memtest.
Note: If you Mac refuses to run the app, you can force it by doing Control-Click -> Open, and then agreeing to the dialog box. Rember is an unsigned app, which is why the Mac may complain. The Control-Click -> Open trick is a way to force the Mac to run the unsigned app.
If you are having problems betting into a full Mac OS X GUI, then you might want to get memtest which can be run from the command line in Single-User mode (boot holding Command-S). If you have installed 'Rember' you can find a copy of 'memtest' buried inside
./Rember.app/Contents/Resources/memtest all
the ./ means you have to figure out the front part of the directory path to Rember.app where ever you stored it.
Here are some additional web sites, but keep in mind that 'Rember' is a wrapper for 'memtest' so when those sites discuss 'memtest', 'Rember' is essentially the same thing.
<http://guides.macrumors.com/Testing_RAM>
<http://osxdaily.com/2011/05/03/memtest-mac-ram-test/>
<http://support.apple.com/kb/ht1509>
<http://support.apple.com/kb/PH11342>

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How Can I Tell if I Have a Bad RAM Terminal?

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