6gb or 12gb corsair 1866 dominator

I have 2 x 6gb kits of 1866 ddr3 dominator,1ntel 940 CPU on Gigabyte GA X58 Extreme motherboard. I run a Inno GTX 295 graphics card (1782mb) & have a Quadro FX5600 (1599mb) card ready to install ,hopefully to give my video rendering projects some serious boost. would I be better to. install the 12gb & run at whatever the CPU allows (1066 or 1333 ...???) or run the 6gb at 1866...??? I have 2 x 6gb kits of 1866 ddr3 dominator,1ntel 940 CPU on Gigabyte GA X58 Extreme motherboard. I run a Inno GTX 295 graphics card (1782mb) & have a Quadro FX5600 (1599mb) card ready to install ,hopefully to give my video rendering projects some serious boost. would I be better to. install the 12gb & run at whatever the CPU allows (1066 or 1333 ...???) or run the 6gb at 1866...???
 

My Computer

System One

  • Manufacturer/Model
    Custom Build
    CPU
    Intel 940
    Motherboard
    Gigabyte GA X58 Extreme
    Memory
    Corsair 6gb @1866mhz
    Graphics Card(s)
    Inno GTX 295, Quadro FX 5600
    Sound Card
    Asus Xonar
    Monitor(s) Displays
    2 X Samsung 25.5"
    Screen Resolution
    1929 x 1200
    Hard Drives
    Solidata SSD 64gb
    4 x Seagate 1.5 TB
    PSU
    Antec 1000w
    Case
    Antec P193
    Cooling
    Air with lots of Fans
    Keyboard
    Gigabyte wireless
    Mouse
    Gigabyte wireless
    Internet Speed
    ADSL+ 2
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