Rich, The support pages for your memory and motherboard will always have this information. They are very specific about because it can wildly between models and brands. ASUS even has Qualified Vendors List (QVL) where they list memory configurations that they can confirm will work. The only way to answer your question is to read through the support documentation on the website for your mobo and RAM. ASUS has literally put up PDF's that have more information on this than most people need.
Looks like for the 990fx the pairing is organized by same-color. So if you have 1 matched pair of DDR3. You can slot them into the brown ONLY, leave the other 2 slots empty and you will get the speed. Assuming the RAM is paired. After setting up the pair in the brown slots, repeat for beige. Since the beige/brown slots are on different channels, you usually don't need to worry about using the exact same sticks or sizes. There are some caveats, but as long as you don't try something too wild and crazy it usually works fine. Of course there only one way to know for sure if your RAM is supported -- RTFM (they have pictures and G.Skill model#'s and everything :-) I'm looking at a PDF from ASUS as I write this that tells me exactly what will work. Clearly the newegg techs have no idea what they are talking about. --Ben On Wed, Jun 6, 2018 at 4:36 PM, Rich Shepard <[email protected]> wrote: > On Wed, 6 Jun 2018, Jim Garrison wrote: > > Each would likely work separately but you'd lose the dual-channel speed >> boost by installing only one. It depends on which motherboard you're >> using. >> > > Jim, > > Currently, the two 4G modules are in slots A2 and B2. The motherboard is > an Asus Sabertooth 990FX. > > Yes, I've done this several times. Again, check your motherboard specs, >> but modern memory controllers are pretty good at figuring out what you >> have installed and using it, as long as the timings are acceptable. >> > > While on the newegg.com web site I had a brief chat with a tech from > G.Skill. He said that combining a pair of 8G modules and a pair of 4G > modules might, or might not, work. Only trying would find out. So, rather > than risk wasting a lot of money on modules that would not work (either > way), I bought another pair of 4G modules of the same specs. A total of 16G > RAM should greatly speed up processing of huge spatial and numerical data > files compared with the 4G in my old 32-bit system. > > Thanks, > > > Rich > _______________________________________________ > PLUG mailing list > [email protected] > http://lists.pdxlinux.org/mailman/listinfo/plug > _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
