This seems to be the right thread. I'm building an A8N SLI Deluxe with A64 3700 San Diego and ASUS 6600GT/TOP. While reading Bleeding Edge's 3700 San Diego Review
I came across this:
--Enhanced Memory Controller - With the new memory controller, 4 single sided modules can be inserted to run without any limitations. With double sided modules, it will revert to 2T - 400Mhz.--
I think that I understand, with a CPU based memory controller instead of going through the Northbridge, single-sided modules can be accessed faster because no bank-switching command is needed. But that begs a huge question...
I am initially going to move two sticks of Corsair XMS512-3200C2 into this machine until my build fund comes back up, then get either an OCZ EL Platinum1GB kit or a TWINX1024-3200XL kit, because of the 2-2-2-5 timings that will work well with the San Diego's direct memory controller.
But both of these use double sided modules. Is there any high-performance single-sided DDR400 worth looking at, or is this little feature just a whisper on the wind? Any help from those with deeper tech knowledge would be great.