Nehalem microarchitecture official name is Core i7, this is the processor to replace Intel’s quad-core 45nm Core 2 Yorkfield/Penryn.
Some of the new features that Intel has introduced with the Core i7, includes Hyper Threading, QPI bandwidth and Turbo Mode.
Intel placed Northbridge onto the CPU die itself and the new Intel QuickPath Interconnect (QPI) will replace the front side bus (FSB), so, no more single bus for all processors to reach memory through Northbridge/Memory Controller Hub which leads to bottlenecking memory access, instead each processor will have its own dedicated memory that it accesses directly through an Integrated Memory Controller. QuickPath Interconnect and QuickPath Memory Controller allows higher bandwidth to memory and lower latencies to memory and these features gives much more power to the games.
Nehalem (family) processors code-named Bloomfield (Core i7) have four physical processing cores and a triple-channel DDR3 integrated memory controller (IMC) over dual-channel increasing memory bus width from 128-bits to 192-bits, supporting memory speeds of up to 1333MHz with memory bandwidth of up to 32 GB/s through 6 memory sockets.
Core i7 CPUs have Support for SMT (simultaneous multi-threading) that allows two threads per core, Task Manager in Windows will show 8 cores (4 physical and 4 logical). 32 KB instruction + 32 KB data L1 cache per core, 256 KB L2 cache per core and a large 8 MB L3 cache shared by all 4 cores.
Currently these processors are only compatible with motherboards based on the Intel X58 chipset with LGA1366 socket.
Addition of 7 new SSE4 instructions, monolithic processor design (all four cores on a single die) and fabricated using Intel’s 45 nm high-k process technology. All this makes Core i7 a super fast processor for your daily and gaming needs.