Recently purchased a Dell Optiplex 780 that is running fabulous for the price I paid, $94+$20 for 3 day shipping, has the best consumer based Intel Core 2 Quad produced in the Q9650, one can see the Speccy specs in my sig below, but will copy/paste below to find easily.
Now, the problem. Dell says the system can run 16GB RAM, and I've already tried two sets, one that I have & a set of GSkill Ripjaws recommended by the 'tech specialists' at Newegg that I had to RMA for a refund, and the Google Trusted Stores consumer protection intervened to knock off the 15% restock fee, otherwise would have eaten a $35 loss to beta test the set on my system. As it was, still lost over $17 for the 3 day shipping & return label for RAM combined.
Now for the confusion, it was after I purchased these & didn't work, that I did some research, and the Intel Q43 & Q45 Express Chipset only supports 16GB on DDR2 boards & 8GB on DDR3 ones, though still the expensive DDR2 RAM only provides 12.8GB/sec, while the 8GB of DDR3 RAM provides 17MB/sec. More below to support this.
Am I wrong in assuming that Intel has baked the 8GB limitation into the MB, or could they had later shipped an update, maybe via a BIOS or other firmware update to overcome the limit? Evidently some of the folks at Dell thinks so, though all of the evidence when researching proved otherwise. The key spec that got me looking was in the manual above.
Intel Q45 Express Chipset w/ICH10DO
That's what led me to the Intel documentation above & discovered what I did, still those on the Dell forum says otherwise, yet no one can provide a simple Dell P/N that would solve the issue in two separate Topics, couldn't find the first one. Here's the one where I just posted a few hours ago on the 2nd page.
How can an OEM overcome the spec shown on the Intel document posted above w/out either a major firmware update, or Dell themselves altered the chipset shipped to end users? Plus Intel hasn't updated the Q43/45 Express Chipset page to reflect any changes.
At any rate, all I want to do is upgrade my Optiplex DT edition, the one just below the mid tower, to 16GB RAM total, it has 4 slots for RAM, and no one can answer. Some has even found the Crucial System scanner to be wrong & the modules sent wouldn't boot. They recommend PC3-12800, 1600MHz in dual channel mode, yet would likely be downgraded to 1333 specs. That wouldn't matter to me, as long as I know my PC, as all that I own, are stuffed to the max. If it's a doable upgrade, I want it & while my preferred brand of RAM is GSkill, am open to other brands. In fact, one of their other Tech specialists side this one may work, since it's double sided, but couldn't say with certainty.
Any Dell Optiplex 780 owner out there who can assist me? I want my RAM to be the most possible, just as my CPU, and purchased on the presumption that it would accept & run 16GB RAM.
All assistance in getting this matter solved is highly appreciated.