Nobody answered my original question, can you fill a motherboard with
four DDR2 slots up to 8GB at all?
Intel's DP965LT motherboard claims 8GB support with 4 DDR2 dimms.
http://developer.intel.com/products/motherboard/DP965LT/index.htm
if you have 4 dimms in this chipset, you're limited to 667Mhz memory
bus, with 2 dimms, and the right memory timings, you can get 800Mhz
memory timings. All memory used in P965 chipsets must be 1.8V compatible.
I peeked at prices on newegg, 2x2GB dimm kits are $430-$600 each, so 8GB
ram will cost between $860-$1200.
This whitepaper on 965 chipset memory technologies details the specifics
of whats supported and how the memory timings interact.
http://download.intel.com/design/chipsets/applnots/31320702.pdf
I see nothing about any degrading above 4GB, except that 2 x 2GB
DDR2-800 is supported, while 4 x 2GB runs at DDR2-667 speeds... I
wonder if the previously discussed performance degrading on the Asus
board was in reference to PAE required to allow 32bit OS's with > ~3GB ram ?
Note this degrading the memory clock when you fully populate all the
rows is not at all uncommon. Many Opteron configurations have similar
limitations.
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