Possible RAM woes!

Well..after posting a question about heat/sluggish performance..got a nice response from the Hatter. Among his many suggestions was to get copy of MemTester (or something like that..). Well, I did, and after I ran the program, the word "FAILURE!!" was scattered all over the report! Question is..does a "failure" report mean my whole bank (4X512) is bad?..or, does it take just one bad chip to earn that label. I'm thinking about taking out the two original Apple chips (about 5-6 years old) and seeing what kind of report I get with just 1 GB of new chips that I added last year. Good idea? If I decide to replace two chips, can I get a couple from OWC and mix them in with another brand? (same specs). By the way, after running initial test, I removed and reseated all memory, and got far fewer failure notices, but still enough to alarm me. Thoughts?? Thanks

You have to start testing and swapping. Can you mix? yes. But I would look at Crucial first.
http://www.crucial.com/mac/
Is there an address of where it fails? It only takes one DIMM of one chip to be bad. Go back to the other post and link to MacIntoch's BAD RAM report (I know it is long, but it is helpful in understanding what is happening).
After swapping and changing RAM configuration. reboot again into OF and reset-nvram as well. You should end up with memtest not reporting any problems hopefully!

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    [snip]
    Today, I ran memtest (www.memtestosx.org) to test my
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