Difference Between Frontside Bus vs. Backside Bus

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Main Difference

Front Side Bus, with the acronym of FSB, was a communication interface for computers used previously in the Intel chip-based devices but discontinued after the use in 1990’s and 2000’s. Back Side Bus, with the acronym of BSB, is a communication interface used for computers and existed in the microprocessor architecture to help with the connection of CPU with the memory line, for most cases L2.

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Comparison Chart

Basis of DistinctionFrontside BusBackside Bus
DescriptionA communication interface for computers used previously in the Intel chip-based devices but discontinued after the use in 1990’s and 2000’s.A communication interface used for computers and existed in the microprocessor architecture to help with the connection of CPU with the memory line, for most cases L2.
PurposeTo connect the processor to the main memory with the aid of level 2 cache.To connect the processor with the cache of level 2.
ProcessingFaster processing speed, and the clock cycle takes less time to complete.Time required for clock cycle and takes longer.
Speed400 to 800 MHz200 MHz
ConnectionA physical connection within the devices and operates at high frequency.A separate link between the device and the bus hence has the same frequency as that of a processor.
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Frontside Bus

Front Side Bus, with the acronym of FSB, was a communication interface for computers used previously in the Intel chip-based devices but discontinued after the use in 1990’s and 2000’s. The FSB was a noticeable PC engineering segment that enabled a CPU to speak with different PC framework assets. It associated the structure memory, input/yield (I/O) peripherals and other board parts to the CPU and gone about as the first transport connect for information around the PC equipment. Be that as it may, although the FSB was an essential part, its constrained speed additionally made it a noteworthy bottleneck. Contingent upon the execution, a few PCs may likewise have a posterior transport that associates the CPU to the reserve. This traffic and the reserve associated with it are quicker than getting to the framework memory (or RAM) through the front-side transport. The speed of the first side conveyance regularly utilized as an immediate measure of the execution of a PC. The FSB speed can be set either using the framework BIOS or with jumpers situated on the PC motherboard. While most motherboards enable you to set the FSB to any setting, guarantee that the FSB is appropriately set unless you plan to overclock the PC. Remember that inappropriate settings may cause issues, for example, equipment lockups, information debasement, or different blunders may emerge with more established equipment. FSB speed is measured in hertz (Hz) and is regularly additionally communicated as a proportion to CPU speed.

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Backside Bus

Back Side Bus, with the acronym of BSB, is a communication interface used for computers and existed in the microprocessor architecture to help with the connection of CPU with the memory line, for most cases L2. BSB is a change in the more traditional routine with regards to utilizing a single framework transport because a single bus frequently turned into an extreme bottleneck as CPUs and memory speed expanded. Because of its committed nature, the posterior transport can be advanced for correspondence with reserve, therefore disposing of convention overheads and extra flags that are required for a broadly useful bus. Moreover, since a BSB works over a shorter separation, it can typically work at higher clock speeds, expanding the PC’s overall execution. Preceding Intel’s Pentium Pro processor, both the L2 reserve and RAM were gotten to utilizing a similar transport, making a periodic bottleneck and diminishing the overall throughput of the PC. Starting with the Pentium Pro, the level-2 (L2) is bundled on a same module or chipset from the processor. A posterior transport (BSB) is an inward transport that interfaces the focal handling unit to the store memory, for example, Level 2 (L2) and Level 3 (L3) reserve. The CPU frequently saves memory in reserve. Here it stores information that is every now and again utilized and should be speedily recovered. The BSB clock recurrence is commonly equivalent to the processor’s, and the next bus can likewise be made significantly more extensive (256-piece, 512-piece) than either off-chip or on-chip FSB.

Key Differences

  1. Front Side Bus, with the acronym of FSB, was a communication interface for computers used previously in the Intel chip-based devices but discontinued after the use in 1990’s and 2000’s. On the other hand, Back Side Bus, with the acronym of BSB, is a communication interface used for computers and existed in the microprocessor architecture to help with the connection of CPU with the memory line, for most cases L2.
  2. The primary purpose of a front side bus was to connect the processor to the main memory with the aid of level 2 cache. On the other hand, the primary purpose of back side bus was to connect the processor with the cache of level 2.
  3. The back-side bus has faster processing speed, and the clock cycle takes less time to complete. Whereas the time required for clock cycle and treatment for front side bus takes longer.
  4. The front side bus acts as a physical connection within the devices and operates at high frequency. On the other hand, the back-side bus is a separate link between the device and the bus hence has the same frequency as that of a processor.
  5. The minimum speed required for a back-side bus ranges up to 200 MHz. On the other hand, the lowest range for a front side bus typically ranges between 400 to 800 MHz