My parents have an Abit AV8 3rd eye motherboard which I have been updating for them.
They have Win 7 (64bit) installed and have 2x1Gb Kingston PC3200 400Mhz DDR and everything runs pretty smooth.
However as they like to do a lot of photo work I thought that they'd benefit from using the two spare RAM slots and so purchased 2 more 1Gb sticks of the same memory from the same supplier.
I installed them and they would not be recognised in the BIOS, but within windows it found the RAM but said that only 2Gb was usable.
I figured that as the mobo was pretty old that it may require a BIOS flash to the latest version (which I succesfully did).
However this has not helped as the Full 4Gb are still not recognised and if I now try to boot the PC it pauses at the begining of the POST process where you are told you can press DEL or TAB key. I can not get past this frozen page by pressing any keys.
Strangely if I remove one (or two) of the four sticks, I can get into the BIOS and even boot windows - but still with only 2Gb available (and sometimes 1Gb depending on which stick is removed). CPU-Z can see all three sticks and reports the correct settings.
I have tested the memory using memtest86+ in pairs and all are fine.
I have tried the RAM in pratically every combination you can think of (my fingers hurt ).
I know that this mobo says that it can only run the 4Gb at 333Mhz so I changed the settings in the BIOS for this but still no luck.
Is this just a case of some sort of incompatability between specific RAM or is this mobo just a bit old for 4Gb to reliably work on it.
It was bought a long time ago when 4Gb seemed overkill for most.
Any help would be appreciated.
Edited by seymourz, 17 February 2011 - 07:27 PM.