Some of these are desktop version, but pretty much same result in notebook world.
|When you get right down to it, for today's performance the differences between using DDR and DDR2 at 533MHz, there is little to no difference. Where DDR2 will shine, is in it's overclocking potential and the promise of future applications making use of it's enhanced speed and bandwidth. As when DDR was first introduced over SDRAM, it will be a while before these advantages are fully realized, but DDR2 will be sure to come into it's own sooner rather than later. Right now, there is no reason to upgrade your existing system based solely on DDR2. However, having said that, if you are already thinking it's time to upgrade, I would definitely recommend going with a DDR2 platform for future expandability not to mention it's overclocking potential.|
|The user should take a closer look when purchasing and especially when upgrading a notebook in the future. In conjunction with the two chipsets (Mobile 915GM and 915PM) and in addition to the DDR2 and dual-channel notebook designs, there's also a variety of DDR memory designs (915GM) and DDR2 single-channel designs available from producers.
Another potential upgrade problem exists when a notebook PC designed for dual-channel operation is equipped with only a single 256 MB DDR2 module. If the user later wants to upgrade to 512 MB or more, he can't be 100% sure that an additional 256 MB will result in a successful upgrade. He may have to buy two new identical 256MB DDR2 modules, or two 512 MB DDR2 modules to upgrade to 1 GB. We don't recommend an upgrade plan for dual-channel systems that involves combining modules of different capacities, such as one DDR2-256 MB and a DDR2-512 MB, because memory performance will go through the floor.
|As the benchmark results tables reveal, the speed advantage afforded by the new platform's dual-channel DDR2-533 memory is a maximum of 5% compared to single-channel mode. This outcome is not really surprising, because if you look at the peak bandwidths of the new CPU's memory and FSB, you can see that the single-channel configuration is already sufficient to provide enough data to the CPU. The doubling of memory bandwidth thus has only a marginal effect on performance.|
|The results can hardly be called sensational. Maximal real bandwidth of DDR2-533 memory really matches the announced 4.3 GB/s in the single-channel mode and exceeds DDR-400 memory bandwidth in it. However, it can't be referred to its indisputable advantages at least because current Intel i915/i925 chipsets supporting DDR2 can also work perfectly in the dual-channel mode. And that makes the single-channel DDR2 absolutely unattractive compared to the same dual-channel DDR. Thus, the main previously-made conclusion holds good: the use of DDR2 will not be appropriate at least until the appearance of the first CPUs with bus frequency of 1067 MHz and higher. This will enable to overcome the restriction imposed by CPU bus speed on real bandwidth of the memory subsystem in the dual-channel mode.|