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Nehalem will come in variants for servers, desktops, and notebooks. The processor for four-socket servers is codenamed Beckton, the chip for two-socket servers Gainstown, and the chip for single-socket desktops is Bloomfield [6].
According to DailyTech, all models of the desktop chip Bloomfield will have three DDR3 channels. The quad core models will have 8 MB of shared L3 cache (Penryn has 12 MB of semi-shared L2 cache), and the high-end models will have a 130 W TDP, compared to 136 W for high-end Penryns[5]. Desktop Nehalem processors will use either Socket LGA715 (Socket H) (according to DailyTech's Kristopher Kubicki) or Socket LGA1160 (according to PC Watch). Kubicki has stated that either he or PC Watch could have old documents. Server processors will use the LGA1366 socket with support for registered DDR3[6].
Seven codenames have been associated with the Nehalem microarchitecture in a PC Watch article. These include two server processors, three desktop processors, and two mobile processors. The server processor, Beckton, will have 44 bits of physical memory address and 48 bits of virtual memory address.
A HKEPC article [7] states that Nehalem is Penryn with microarchitectural and power efficiency improvements, including better lower power states and leakage reduction. Nehalem will, compared to Penryn, have 1.1x to 1.25x the single-threaded performance, 1.2x to 2x the multithreaded performance, 30% lower power usage for the same performance, and higher performance for the same power usage. It also states that Nehalem will have a "turbo mode" that enables cores to run at faster speeds than the TDP rated speed. Due to its early release and market segment, Bloomfield will not have an integrated memory controller, but it will still have QuickPath Interconnect. Its corresponding Tylersburg chipset supports dual channel and triple channel RAM, and a maximum of 24 GB RAM. Tylersburg will also support Quad CrossFireX.
