which the faster Flash or Ram or Cash memory?

Question

plese i want the answer quickly

Answer 1

Here are the access speeds of different memory options :
There are different usesof flash ROM chips :

a. the flash drives that we use over USB; those drives speed is limited to the speed of the USB port you connect it to. While USB 1.1 is much slower with USB2 it is almost as fast as accessing a hard drive.
b.There is also some flash rom's on your machine like your motherboard BIOS, graphics card BIOS or CD/DVD drive BIOS (almost all new devices have flashable BIOSes these days) those.
In generatl Flash ROM chips are pretty fast (less than RAM thoguh) but as we access them through different slow busses (USB,PCI,AGP,etc) on our computer they are slow to access.
Flash ROMs don't loose their content on power off.

RAM is the second fastest accessible memory on PCs. They run at speeds of a multiple of FSB (Front Side Bus) which is the default frequency of mainboard. (all other busses run at a divisor of FSB except RAM and CPU (thus cache) which run at a multiple of FSB) An example from old computers is a 133Mhz FSB computer use 133Mhz SDRAM and if it uses DDR-RAM (double data rate) it is 266 MHZ. CPU can be 133x8 = 1Ghz

Cache memory (other than HDD and CD/DVD Writer internal chip caches which you can not use or access) resides in the CPU chip on the same waffer as CPU blocks and is the fastest RAM on a PC (but you can't directly access or use them). There are two types of cache : Level 1 and Level 2. Level 1 cache (~32kb code+data) runs at the exact same clock speed as CPU thus has zero latency. Level 2 cache (128kb-2MB) runs either at same speed or at half speed then CPU (1 wait cycle).

So the list from fastest to slowest is : CPU (registers+Level0 cache) - Level2 Cache (maybe same as L0) - RAM - Video RAM on GPU (through AGP x2 x4 x8 or e-PCI) - Harddisk/USB flash drive

Loren Soth

Answer 2

Ram would be faster. Flash and Cache memory, I would think require a longer Read/Write time.

Answer 3

Ram is by far he fastest available memory. Cache memory is usually on the hard drive which is relatively slow

Answer 4

In your question you are comparing different things

Flash is external memory.....slower than internal ones

RAM & Cache--depends on the size of the two, smaller the size faster the product. but that doesnt mean that you shud have lesser RAM or Cache in your system......it is the optimum amount we need.