I currently have 4 gig of ddr3 RAM in my pc (single stick). My motherboard is an H97 PRO Gamer. I want to add more ram since 4 gigs isn't enough! From what I understand if I add two more 4 gig sticks, two sticks will be in dual channel and one will be in single, is this correct? I'd make sure that the new sticks would be exactly the same as the original one in my pc.
I also read in the manual that I could add ram with different capacities. here is what it says in the manual:
"You may install varying memory sizes in Channel A and Channel B. The system maps the total size of the lower-sized channel for the dual-channel configuration. Any excess memory from the higher-sized channel is then mapped for single-channel operation."
From what I can tell if I had a 4 gig stick and added an 8 gig stick it'd run 8 gigs in dual channel (half being from the 8 gig stick) and 4 gigs in single channel (being the other half of the 8 gig stick)
I really doubt it would work like that to enable dual channel, but it will work as far as registering all of the RAM and giving you to work with, though it will probably be in Single Channel.
The performance benefit dual-channel provides over single is not incredible. But if you're serious about preserving that, you're better off getting matching RAM sticks.
I've been running 3 sticks of 2GB DDR3-1066 with a Q8400 on a Gigabyte EP45T-UD3LR for over 5 years in my secondary rig and it's working fine. I wouldn't worry too much ;)
Ive never had a problem with mixed memory ( currently running a 3x512mb 1x256mb me config right now in my legacy gaming machine.) Your memory will only run in single channel mode though.