7 GB ram ( 4 usable ) Gigabyte GA EX58 UD5

[white_dove]

I changed from Windows 7 Ultimate x86 to x64 and i upgraded my ram memory from 3 GB to 7 GB.
But in Control Panel i have this : 7 GB ( 4 GB usable )
Can you tell me,please, why only 4 GB, when i have 7 in total ?
Would that help BIOS update ? Should i try to change the memory bars - slots ?
I use to have 3 GB DDR3 in triple channel ( 3 x 1 GB ) and i added soon 2 x 2 GB DDR3
Maybe the order they are in the RAM slots on the mobo is not okay?
Could that be the reason ?
I have now 3 x 1 GB in slots 1, 3 and 5
And the 2 x 2 GB are in 4 and 6
Please help me. Thanks in advance
PS : I use now BIOS version F9

[Aussie Allan]

  To run in triple channel......Ideally the dimms need to be a matched set.....ie   3 x 2048 Double sided dimms in the correct slots stated by your boards manual


  The days of popping in several different dimms, from several different manufactures and expecting the board to work well, let alone boot....are gone!

  the best you could hope for under the present ..... is to rearrange the dimms so it's running in single channel and hit BIOS and Optimized defaults to see if the board will recognise the higgledy-piggledy install......what your trying to do......... although cost effective........is like stuffing a AMD processor into a Intel socket

                                                         

                                      Buy a matched set and get on with Computing ....or a big box of Panadol!

   Aussie Allan

[Dark Mantis]

Hi

I am afraid that I agree with Allan and your chances of ever getting a working system using these different memory sticks is extremely unlikely. If they were identical modulkes  just a different size that might be different as you wiould instal the larger ones in the fiorst slots and then the smaller ones in the second set of slots but you cannot even do that.

Just buy some new matched memory kit and flog your old ones on Ebay. Also when you do make sure that you purchase a kit for triple channel memory not dual channel like you just installed!