I have made a lot of progress following your suggestions. My current settings are:
| ACT to ACT Delay (tRRD) | 3 |
| Rank Write to READ Delay | 11 |
| Write to Precharge Delay | 5 |
| Refresh to ACT Delay | 52 |
| Read to Precharge Delay | 3 |
| Static tRead Value | 6 |
Leaving Rank Write to Read Delay at 11, I was able to move everything else back down to the upper then lower levels you listed and the last two beyond that back to the default settings. So it looks like Rank Write is the culprit. I will now set it lower and see how far I can get and remain stable, unless you suggest otherwise.
I am going to download the trial version of Everest and will test tonite.
I tried to download free PC Mark 2006 - but after a download of almost 1 GB it would not open.
I ran Sandra again and the tests reported about a 10% improvement - not the amount I was hoping for - and I am not sure how or what it is reporting either. I tested memory at PCPitstop.com and it reported the memory at 10.4 GB/s compared to a "normal" of 11.26.