Using 667 and 800 ram together Tags: DFI DDR2 RAM Motherboards Last response: March 27, 2010 6:35 PM in Motherboards Share mickyavalon April 21, 2009 11:24:29 AM Hello I have a DFI NF ULTRAII-M2 currently with 2 x 1gig DDR2 667. I put in a 2gig DDR 800 next to it, but my windows only shows 2gig ram still. How can I get this to work? or because it my MB doesn't support 800, will the 800 ram I put in not run at 667? Cheers More about : 667 800 ram starams5 a b V Motherboard May 1, 2009 7:49:04 AM Hi 667 and 800 ram have different CAS Latency's. It would probably be wise to run one or the other but not a mix. Anonymous a b V Motherboard March 27, 2010 6:35:18 PM When you upgrade the memory in dual mode make sure both are in equal speeds otherwise some mother boards wont detect both.. Can't find your answer ? Ask ! Publish Related resources Using both 667 & 800 ddr2 ram on same motherboard??? Forum So guys my morherboard supports 667 800 and 1333mhz ram and can i use 400mhz on that? Forum SolvedDDR2-533 ram on DDR2-667/800 MoBo Forum SolvedDDR2 667/800 ECC RAM in a desktop? Forum Solvedmixing of 800mhz and 667mhz rams Forum Solved800MHz or 667 MHz RAM for 1333 MHz FSB on core 2 duo e8400 Forum SolvedI'm doubful whether i can add ddr2 2gb 800 ram with ddr2 1gb 667 ram to my pc Forum SolvedI want to change my ddr2 ram 667mhz to ddr2 800mhz ram Forum Does 667MHZ RAM work with 800MHZ motherboard? Forum 4 Gig 800Mhz Crutial Ram or 6 Gig 667Mhz Forum SolvedWhy is my ram at 667 instead of 800 Forum 2 rams 800 MHZ 3 OR 4 ram STICKS 667 MHZ SAME MATCHED ram Forum SolvedDDR2 RAM 800 mhz works individually but not working together Forum DDR3 10700 (667 MHz) RAM only running at 800 MHz/DRAM:399.0MHz Forum SolvedUsing 2GB + 4GB Ram Together on Laptop Forum Dual Different Rams Both DDR2 800 running @667 why Forum Can i put 2gb ddr2 800Mhz ram one port and other port 1gb ddr2 667Mhz ram Forum Using 667mhz and 800mhz Forum With 333 FBS 1:1 DDR2-667 or DDR2-800 using divider Forum [RAM & Motherboard] Ram in Bank 2,3 only running at 667Mhz not 800Mhz Forum More resources Read discussions in other Motherboards categories BIOS Boot Chipsets ASRock Asus Chaintech DFI Elitegroup FIC Foxconn Gigabyte Intel MSI-Microstar !