relation between MBPS,mbps,mhz

[senthil]

in one of the spec i saw,
256 mbps ( PCI 66 mhz).so please explain me what is the relation between mbps,MBPS & mhz.
thanks

[DANQU]

Definition for: MBps

Megabytes per second (million bytes per second).

Definition for: mbps

(Also Mbps) Megabits per second (million bits per
second).Used to measure the rate of information transfer.


Definition for: MHz

(MegaHertz or megahertz).Millions of cycles per second.
The unit of frequency used to measure the clock speed of
a computer.

I received these definitions from web-site:
http://www.computeruser.com/resources/dictionary/index.html

Dan

[ixl]

"bps" means "bits per seconds" or "bytes per second". Unfortunately, the terms are not used in any sort of reliable manner. Sometimes people use "B" for bytes and "b" for bits, but that's far from standard!
Hz is cycles per second. So "Hz" and "bps" are related by however many bits or bytes can be transfered in each cycle. In the case of 66 MHz PCI, it can transfer either 32 or 64 bits per cycle. Thus 4 bytes or 8 bytes. 4 bytes would be 4 * 66 which is about 266 MBps.


------------------
Charles M. Kozierok ( ixlubb@PCGuide.com )
Webslave, The PC Guide (http://www.PCGuide.com)
Comprehensive PC Reference, Troubleshooting, Optimization and Buyer's Guides...

[dale]

And just to add more confusion to this stuff, it used to be that when you bought a PC you had only a couple things to consider:

Mhz (associated only with the CPU speed, like 133 Mhz CPU)

RAM (associated with how much RAM Memory you had, like 64 Mbytes)

Now, you have to consider not only CPU and CPU RAM speed and size, but also the speed and size of:

PCI Bus - this is the I/O buss for transferring data to/from peripherials and you have 66, 100 and 133 Mhz busses.

Video RAM - Used to be video cards had just a small amount of RAM (or none) and was not an issue. Now you have these beefy video cards (some more powerful than the system you are buying) that have onboard CPU and RAM that have their own Mhz and RAM Mbytes ratings.

RAM Memory - there are several types of memory and memory speeds to consider. Like PC100, PC133 and then EDO, SDRAM and many more.

My favorite acyronm is PCMCIA. There is some offical meaning like "Personal Computer Memory Card Interface Adapter" or something similar, but I like to say its "People Can't Memorize Computer Industry Acryomns" :-))

dale