I have an Intel mobo that supports DDR2 667 memory and DDR2 533 memory. I had 1 STICK of 512 MB DDR2 533 memory and I just added 2 sticks of 1 GB DDR2 667. I have 4 DDR2 SLOTS. I have installed the memory correctly and the system is seeing all 2.5 GB of it, but I am guessing that it is running at the slower 533 speed. My question is: Should I leave it this way or should I remove the single 512 MB stick? Will the 2GB alone running at 667 Mhz be faster than the 2.5 GB memory running at 533 Mhz?absolutely , take out the 512

UPDATE* drw & I spoke on an email, I didn't ignore him ~ honvetops,

I will remove the 512 memory stick, but do you mind explaining why? I know that the 2 1GB sticks will be running in dual channel mode at the 667 Mhz speed if I remove the 512 MB stick. Is that why? Did I just answer my own question or is there another REASON to remove it? Mismatch in Speed should be alright. Only thing is overall memory speed will be slowest of all the memories. Look up the Notes in http://www.intel.com/support/motherboards/desktop/sb/CS-009033.htm.If your motherboard has dual channel support, then yes, remove the slower 512. Realistically, you WOULD not notice a difference between 533 and 667mhz memory except in dual channel, which requires A1+A2=B1+B2, as this effectively doubles the speed.Thanks for the replies and LINKS. I appreciate it.