That's why I gave you the bios version. I know that my bios is a bit old and I know for sure that ACER have the 1.04 and later updates. It could be the case that the "memory remapping" feature is available in these updates. As richc46 said, there is no harm in doing this test. In the meantime I will send an e-mail to ACER to check if this feature is included in the latest updates.
richc46 I have done the first part of the test with memtest, that is doing at least 8 runs for both chipsets. I am attaching the screenshot for you to see. Later on the day I should start testing the individual chipsets/slots. I hope the screenshot is clear enough for you to see. Will let you know about the outcome of the next tests.