MHz


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MHz

Symbol for megahertz, i.e. 106 hertz.

mHz

(physics)

MHz

(physics)

MHz

MHz

(MegaHertZ) One million cycles per second. MHz is used to measure the transmission speed of electronic devices, including channels, buses and the computer's internal clock. A one-megahertz clock (1 MHz) means some number of bits (1, 4, 8, 16, 32 or 64) can be manipulated at least one million times per second. A two-gigahertz clock (2 GHz) means at least two billion times. The "at least" is because multiple operations often occur in one clock cycle.

Both megahertz (MHz) and gigahertz (GHz) are used to measure CPU speed. For example, a 1.6 GHz computer processes data internally (calculates, compares, copies) twice as fast as an 800 MHz machine.

Why Isn't It Faster?
A CPU in the new computer billed as twice the MHz or GHz as the previous computer does not mean twice as much finished work gets done in the same time frame. Internal cache and CPU architecture plus the speed of the RAM, storage and network all contribute to the computer's actual performance and overall throughput. See cache.

Users are often dismayed to find only incremental improvements after purchasing a so-called "faster" computer. In addition, newer versions of software are sometimes slower than previous versions, and a faster computer is often required just to maintain the same performance level as the old software. See instructions per second, Hertz and space/time.

MHz and GHz Are the Heartbeat
When referencing CPU speed, MHz and GHz rate the raw, steady pulses that energize the circuits in a chip. The German physicist Heinrich Hertz identified electromagnetic waves in 1883, and coincidentally, "Herz" in German means "heart."


Speed and Width
Megahertz (MHz) and gigahertz (GHz) are the CPU's clock speed, and the number of bits (8, 16, etc.) are the width of the CPU's registers. The combination of speed and width determines the inherent processing performance of the CPU chip. Parallel channels from the CPU to external devices are also measured by speed and width; however, serial channels are rated only by speed. See parallel transmission, serial transmission and PC data buses.
References in periodicals archive ?
All telecommunications companies except for Vodafone obtained frequencies on the best frequency band of 900 MHz and part on the other frequency band.
A DoT official said that the only change in the existing 900 MHz will be in the Delhi circle, where Idea will get 5 MHz-- 3 MHz from Airtel and 2 MHz from Vodafone.
Many observers insist that Europe should not make the same mistake as with the 800 MHz band where the auctions took place without coordination leading to early starts in some countries with a limited range of compatible devices.
The 200 MHz bandwidth signal covering 120 to 320 MHz carries the programmed frequency modulo 200 MHz.
The redistribution of frequency bands made Orange the biggest winner, getting 10 MHz for $484m ($48.
The Reserve price approved is Rs 3646 Cr pan-India per MHZ in 800 MHz, Rs.
The expected first resonant frequency would be about 115 MHz for a 1000 mil by1000 mil grid and about 75 MHz for a 1500 mil by1500 mil grid.
PMC-Sierra (Nasdaq:PMCS) recently introduced the fourth generation of its RM7000 product family, the RM7000C and RM7065C 64-bit MIPS-based processors with maximum production clock speeds of 600 MHz.
Contract notice: Choosing a provider for the professional advisory services and access to software to implement complex electronic auction, which includes a number of articles and several rounds of allocation of radio frequencies in the 700 mhz, 1400 mhz, 1800 mhz, 2100 mhz, 2300 mhz, 3500 mhz and 3700 mhz frequency bands.