ga-880ga-ud3h ram issue

[snitzle_iii]

so i have 2x2 then i bought 4x2 and installed.  windows showed 12g for a little while then it started showing that i has 12 installed but 8 usable only.  it would show i had 13 minstalled or 11.  basically i tested each ram in each slot and they all seem ok.  the 2x2 kit is from 2 years ago.  the 4x2 i just bought last week.  i can only detect 12g if its at 1333 or 1600; if i have it at 1120 (4x) it will only post 8 gigs.  what is going on?  weak memory controller?  my temps are fine for the nb 57c.  not even doing a crazy oc

1055t
fsb-285
3.999
ht/nb 2240
ram works at either 1120 or 1492 but only shows 8 of 12;  bios shows 8, windows shows 8, but cpu shows 12

[autotech]

need a bit more info like what ram you are using and the default speed of it.

[snitzle_iii]

using http://www.newegg.com/Product/Product.aspx?Item=N82E16820231277 and http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314

[Tiger]

Mixing multiple memory kits together is not guaranteed to work by memory manufacturers.

Footnote #3
http://www.gskill.com/products.php?index=222

3. G.SKILL guarantees module compatibility within this specific memory kit. Combining with other memory kits or modules (even with same model name) is not recommended to avoid any compatibility issues