Gigahertz to Megahertz
GHz
MHz
Conversion History
| Conversion | Reuse | Delete |
|---|---|---|
1 GHz (Gigahertz) → 1000 MHz (Megahertz) Just now |
Quick Reference Table (Gigahertz to Megahertz)
| Gigahertz (GHz) | Megahertz (MHz) |
|---|---|
| 1 | 1,000 |
| 2.4 | 2,400 |
| 3.6 | 3,600 |
| 4.8 | 4,800 |
| 5 | 5,000 |
| 6 | 6,000 |
About Gigahertz (GHz)
A gigahertz (GHz) equals one billion hertz and is the standard unit for modern CPU clock speeds and Wi-Fi channel frequencies. Consumer processors typically operate between 1 and 5 GHz; high-performance chips with boost clocks reach 5–6 GHz. Wi-Fi operates on two main bands: 2.4 GHz (longer range, more congestion) and 5 GHz (faster, shorter range), with Wi-Fi 6E adding a 6 GHz band. 5G cellular networks use sub-6 GHz bands for wide coverage and mmWave bands above 24 GHz for extreme bandwidth in dense areas.
A typical laptop CPU runs at 2.4–4.8 GHz. Wi-Fi 5 routers operate on the 2.4 GHz and 5 GHz bands. A microwave oven heats food using 2.45 GHz radiation.
About Megahertz (MHz)
A megahertz (MHz) equals one million hertz and covers FM radio, VHF/UHF television, and older CPU clock speeds. FM radio in most countries is allocated the 87.5–108 MHz band. Early home computers and microprocessors ran at 1–20 MHz; the original IBM PC used an 8088 at 4.77 MHz. Wi-Fi channels in the 2.4 GHz band have bandwidths of 20 or 40 MHz. Wireless standards including Bluetooth, Zigbee, and many cellular bands also operate in the low hundreds of megahertz up to a few gigahertz.
FM radio broadcasts between 87.5 and 108 MHz. The original IBM PC ran at 4.77 MHz. Many smartphone processors boost to over 3,000 MHz (3 GHz).
Gigahertz – Frequently Asked Questions
Does a higher GHz CPU always mean a faster computer?
No. Clock speed is only one factor. A modern 3 GHz core can do far more work per cycle than a 2005-era 3 GHz Pentium 4 thanks to wider pipelines, better branch prediction, and larger caches. And a 2.5 GHz chip with 16 cores can outperform a single 5 GHz core on multi-threaded workloads. GHz tells you how fast the clock ticks, not how much work each tick accomplishes.
Why does a microwave oven operate at 2.45 GHz specifically?
The 2.45 GHz frequency sits in the ISM band, so it doesn't need a broadcast license. Contrary to popular belief, it is not the resonant frequency of water — water absorbs microwave energy across a broad range. 2.45 GHz was chosen because it penetrates food a few centimeters deep before being absorbed, cooking the interior rather than just scorching the surface. At much higher frequencies, energy would be absorbed in the outer millimeter.
What is the difference between the 2.4 GHz and 5 GHz Wi-Fi bands?
The 2.4 GHz band has longer wavelengths that penetrate walls better and travel farther, but it only has three non-overlapping channels and is congested by Bluetooth, microwaves, and neighbors. The 5 GHz band offers 23+ non-overlapping channels and higher throughput, but signals attenuate faster through walls. Wi-Fi 6E adds the 6 GHz band — even more channels, even shorter range.
How do overclockers push CPUs past their rated GHz and what are the risks?
Overclocking raises the clock multiplier or base clock in the BIOS, increasing operating frequency beyond the manufacturer's spec. A chip rated at 3.6 GHz might hit 5.2 GHz with extra voltage and aggressive cooling. The risks are heat (silicon degrades faster at high temperatures), instability (random crashes if voltage is insufficient), and reduced lifespan. Extreme overclockers use liquid nitrogen to keep the chip at -196°C for record-breaking single benchmarks.
What are 5G mmWave bands and why are they measured in tens of gigahertz?
Millimeter-wave (mmWave) 5G operates between roughly 24 and 47 GHz — frequencies with very short wavelengths (hence "millimeter"). These bands offer enormous bandwidth (up to 800 MHz per channel vs. 100 MHz on sub-6 GHz), enabling multi-gigabit speeds. The trade-off is brutal: mmWave signals are blocked by walls, foliage, even rain. Carriers deploy it in dense urban areas and stadiums where short-range, high-capacity service makes economic sense.
Megahertz – Frequently Asked Questions
Why did the original IBM PC run at the oddly specific speed of 4.77 MHz?
IBM needed a clock that could derive both the CPU timing and the NTSC color-burst frequency (3.579545 MHz) for the built-in composite video output. Multiplying the color-burst frequency by 4/3 gave 4.77 MHz — a convenient compromise that let one crystal oscillator serve two purposes. The weird number was pure engineering pragmatism, not performance targeting.
What is the 433 MHz band and why do so many gadgets use it?
The 433.05–434.79 MHz range is an ISM (Industrial, Scientific, Medical) band that is license-free in most of Europe. Cheap remote-control key fobs, weather stations, garage door openers, and IoT sensors all crowd into it because you can legally transmit at low power without a radio license. In the US, the equivalent unlicensed band is 315 MHz, which is why European and American car key fobs are not interchangeable.
How does FM radio achieve better sound quality than AM at a higher MHz frequency?
AM encodes audio by varying the wave's amplitude, which is vulnerable to electrical interference (lightning, motors). FM varies the frequency instead, making it inherently noise-resistant. FM also has a wider channel bandwidth (200 kHz vs. AM's 10 kHz), allowing it to carry the full 20–15,000 Hz audio spectrum in stereo. The MHz carrier frequency itself isn't what improves quality — it's the modulation method and bandwidth.
What happened to the megahertz race in CPUs during the early 2000s?
Intel and AMD marketed processors by clock speed — 500 MHz, 1 GHz, 2 GHz — implying faster was always better. By 2004, Intel's Pentium 4 hit 3.8 GHz but ran so hot and consumed so much power that performance-per-watt cratered. The industry pivoted to multi-core designs: instead of one core at 4 GHz, you got two or four cores at 2 GHz each, doing more total work with less heat. Raw megahertz stopped being a useful buying metric.
Why is Bluetooth limited to the 2,400 MHz band?
Bluetooth operates in the 2.4 GHz ISM band (2,400–2,483.5 MHz), which is reserved globally for unlicensed use. This avoids the need for regulatory approval in each country. The trade-off is sharing the band with Wi-Fi, microwaves, and baby monitors. Bluetooth mitigates interference by hopping between 79 channels 1,600 times per second — if one frequency is jammed, it has already moved on.