If a core is operating below maximum limits and your workload demands additional performance, the processor frequency will dynamically increase until the upper limit of frequency is reached. This is used for power saving or to prevent CPU overheating rather than for compatibility because modern applications use the real time clock for timing instead of the CPU clock. AMD Turbo Core technology dynamically adjusts to give you a performance boost just when the operating system requests the highest processor performance.
#What is turbo boost on a laptop software#
Modern PCs that support ACPI power management may provide software controls to switch ACPI performance states or other CPU throttling modes. One example is DOSBox, which offers an adjustable emulation rate. While the implementation of an actual hardware turbo button has disappeared on modern machines, software developers have compensated with software replacements. As software began to rely on other timing methods, turbo became mostly irrelevant to new programs. The frequency displays largely disappeared or were reprogrammed to display "HI"/"LO" when CPU speeds reached 100 MHz, since most systems only had a two-digit display.Īs new computers continued to get faster and had a wide variety of available speeds, it became impossible for software to rely on specific CPU speed. Please note that the Turbo Boost will stop when any sensor detects a temperature increase, which in a laptop may happen more frequently (normally when the GPU heats up). This is further explained in Intel's Turbo Boost Technology frequently asked questions. The feature was relatively common on systems running 286 to 486 CPUs, Īnd rarely on first generation Pentium CPU equipped computers. Turbo boost is automatic with no possible control by the user. Unlike the turbo button that was common on computer cases, the turbo button on the keyboards did not control the clock rate of the CPU rather, it controlled the keyboard repeat rate. Some keyboards had a turbo button as well, located near right Shift. Some systems also supported keyboard combinations Ctrl- Alt- + and Ctrl- Alt- for switching turbo mode on and off ITT Xtra used Ctrl- Alt- ? to toggle. On some systems the turbo button was linked to a turbo LED or two-digit segmented display on the system case, although in almost all cases, the indicated frequency (in MHz) wasn't a measure of the actual processor clocks, but the two "fast" and "slow" display options set by jumpers on the motherboard (or a daughterboard linked to the button), or on some later machines, set in the BIOS software. On most systems, turbo mode was with the button pushed in, but since the button could often be wired either way, on some systems it was the opposite. Engaging turbo mode slows the system down to a state compatible with original 8086/ 8088 chips. To provide some compatibility, the "turbo" button was added.
Games in particular were often rendered unplayable. With the introduction of CPUs which ran faster than the original 4.77 MHz Intel 8088 used in the IBM Personal Computer, programs which relied on the CPU's frequency for timing were executing faster than intended.
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