Originally Posted by Sydney_bristow
After these dissenting responses, I went to find sources to support my first response stating that there is no difference between 533 and 667 memory.
Here is one, from tom's hardware:
"Two cores automatically entail more memory access. To prevent the Front Side Bus (FSB) in these new CPUs from becoming a bottleneck, Intel raised the FSB clock rate from 133 MHz to 166 MHz in this latest incarnation. Since Intel deploys a quad data rate protocol, four data transfers occur per cycle, resulting in speed designations of FSB533 and FSB667. That increase boosts maximum FSB bandwidth from 4.2 GB/s to 5.3 GB/s. This is still well below the maximum memory bandwidth of 10.76 GB/s possible for DDR2-667 dual channel memory technology.
As a consequence of this improvement, installing DDR2-667 RAM in a Centrino Duo system removes the chances of the CPU being required to wait on memory for data delivery. Strictly speaking, DDR2-533 RAM, with a maximum bandwidth of 8.5 GB/s, is already sufficient to meet the needs of fast FSB667 in the dual core CPU. You should thus not worry if you look at a brand-new Yonah system and find it outfitted with DDR2-533 SO-DIMMs - faster DDR2-667 modules are more expensive and won't boost performance measurably."
There are other sources that state the same thing, but i dont have time atm to look for them.
Digital Man: you rock too!
TO everyone else looking at the dell site and talking about 667 memory configs on the E1705: the early versions of the E1705 were config's with 533 for the quoted reason above, the limited availability of the 667mhz stuff is what makes the price so high, even 1 week can have a dramatic effect on RAM price and if Dell's RAM config's / price fluctuates greatly then that is a GREAT thing, this would mean they are keeping up with availabiltiy / price issues with the ram.
Overall, the performance increase is almost NOTHING in the percievable world. Weight the bragging rights vs. the cost. It's your dime!!!