Oh man! It is just the wrong driver. That is all it is. When I did a fresh windows install back when I had my 9800GTX+ GPUZ would read almost the same thing 64 bit mem bus ect, It just takes a older driver, I know the latest drivers work with the 9800GTX+, But the 9800GT is different (funny) my friend had a 9800GT before I gave him my 9800GTX+, And he had to use one of the older drivers it was version 195.62 ,
But that's all it was, I hope you did not hurt anything taking your PC apart, I have no idea why someone would tell you to pull out your ram sticks, (That was crazy and had nothing to do with your GPU, Maybe he was messing with you) But I know this was long ago, But if you still have that pc? This is the driver that will do the job 195.62 http://www.oldapps.com/nvidia.php?old_nvidia=16?download
You would think the driver would have been the first thought hu?
Why do I always answer old posts?