Analysis Nehalem's happy memories: record DRAM bandwidth
Supported speeds
Officially, at this moment, Bloomfield and Gainestown will support up to DDR3-1333 memory speed in both standard and registered varieties (servers only for the latter), both ECC and non-ECC. Does this sound sluggish, knowing that this CeBIT saw OCZ, Corsair, Kingston and others show DDR3-2133 memories, running at CL9 no less, on Nforce 790i?
Not really - the first DDR3-1333 CL5 ultra low-latency parts are out, some of them in 2 GB density per DIMM module. On the desktop Bloomfield, with three channels and two DIMMs per channel, this gives you a comfortable - even for Vista bloatware - 12 GB RAM. The bandwidth? A whopping 32 GB/s total peak memory bandwidth across all channels, same as dual-channel DDR3-2000.
Furthermore, there is no FSB bottleneck that lets current Penryns access only half of that huge dual-channel DDR3 - the three channels in Nehalem are, through the on-board memory controller, accessed directly by the CPU's L3 cache. Even if Intel just bolted on a 3-channel version of X48 chipset's DDR3 controller, and removed the FSB blockage, you'd still be able to get at least 25 GB/s Sandra memory bandwidth scored with such DDR3-1333 memory configuration.
What about the dual socket part, the one to power the Skulltrail successor? Well, Intel's slides show it having slightly over four times the bandwidth of the best current dual-socket Harpertown with four FBD-800 channels. Knowing we easily get 9 GB/s there, we're talking about a 36 GB/s dual-socket workstation Sandra memory bandwidth score - a massive leap of nearly three times over the best AMD systems too.