Haswell HSW is Intel 's microarchitecture based on the 22 nm process for mobile, desktops, and servers. Haswell, which was introduced in , became the successor to Ivy Bridge. Haswell is named after Haswell, Colorado Originally Molalla after Molalla, Oregon , it was later renamed due to the difficult pronunciation. In Intel introduced Haswell's successor, Broadwell.
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Haswell HSW is Intel 's microarchitecture based on the 22 nm process for mobile, desktops, and servers. Haswell, which was introduced in , became the successor to Ivy Bridge. Haswell is named after Haswell, Colorado Originally Molalla after Molalla, Oregon , it was later renamed due to the difficult pronunciation. In Intel introduced Haswell's successor, Broadwell. For desktop and mobile, Haswell is branded as 4th Generation Intel Core processors. Haswell-based chips are manufactured on Intel's 22 nm process.
While sharing a lot of similarities with its predecessor Ivy Bridge , Haswell introduces many new enhancements and features. Haswell is the first desktop-line of x86s by Intel tailored for a system on chip architecture.
This is a significant move that will continue to be developed over the next couple of microarchitectures. Overall Haswell shares the same basic flow as Sandy Bridge and Ivy but expends on them considerably in the execution engine with wider execution units and additional scheduler ports.
The memory hierarchy in Haswell had a number of changes from its predecessor. Significant enhancements have been done to support the new gather instructions and transactional memory. With Haswell new port 7 which adds an address generation for stores, up to two loads and one store are possible each cycle.
Additionally there is a unified second level TLB. The front-end is the complicated part of the microarchitecture as it deals with variable length x86 instructions ranging from 1 to 15 bytes. The main goal here is to fetch and decode correctly the next set of instructions. The fetched instructions are then moved on to an instruction queue which has 40 entries, 20 for each thread.
Haswell continued to improve the branch misses although the exact details have not been made public. The cache supports microcoded instructions being pointers to ROM entries. Cache is shared by the two threads. Following the instruction queue , instructions are coded via the complex 4-way decoder. The decoder has 3 simple decoders and 1 complex decoder.
The unit handles both micro and macro fusions. Push and pops as well as call and return are also handled at this stage. Continuing with the decoder is the register renaming stage. This is crucial for out-of-order execution. In this stage the architectural x86 registers get mapped into one of the many physical registers. The integer physical register file PRF has been enlarged by 8 addition registers for a total The ROB is fixed split between the two threads. Additional scheduler resources get allocated as well - this includes stores, loads, and branch buffer entries.
For the most part, the renamer is unified and deals with both integers and vectors. Resources, however, are partitioned between the two threads. Both the load and store in-flight units were increased to 72 and 42 entries respectively.
Retirement is once again in-order and frees up any reserved resource ROB entries, PRFs entries, and various other buffers. Some of the biggest architectural changes were done in the area of the execution units.
The various ports have also been rebalanced. The new port 6 adds another Integer ALU designs to improve integer workloads freeing up Port 0 and 1 for vector works. It also adds a second branch unit to low the congestion Port 0. The second port that was added, Port 7 adds a new AGU. This is largely due to the improvements for AVX2 that roughly doubled its throughput.
Additionally a bit FMA unit were added to both port 0 and port 1. Additionally those chips need to be paired with the Intel X99 Chipset. The K and the K are hexa-core parts whereas the X is an octa-core part. The clock is generated internally by the chipset, but motherboard ODMs could generate it independently. Internally, the various voltage planes are all derived from there. From WikiChip. Ivy Bridge. Warning: Overclocking can result in better performance for many types of workloads but it does so by pushing the system beyond its rated specifications.
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Haswell has been launched in three major forms: . Compared to Ivy Bridge :. Around the middle of , Intel released a refresh of Haswell, simply titled Haswell Refresh. This improved TIM reduces the CPU's operating temperatures and improves the overclocking potential, as something that had been problematic since the introduction of Ivy Bridge. The first digit of the model number designates the largest supported multi-socket configuration; thus, Exx v3 models support up to dual-socket configurations, while the Exx v3 and Exx v3 models support up to quad- and eight-socket configurations, respectively.