What Is The Difference Between 32-bit & 64-bit Windows?

“What is the difference between a 32-bit and 64-bit Windows operating system?” Most of you are running Windows XP or Vista in its 32-bit iteration. But as hardware gets cheaper, people are curious as to what the 64-bit operating system has to offer. First let’s see if we can grasp the difference between 32- and 64-bit.

Think of your computer as a series of tubes that can either be 32 or 64 bits wide. When you have the smaller 32-bit size, there is more potential for bottlenecks to occur. Bottlenecks slow down your system because one process has to wait for another to finish before it can begin. But if you want to have 64-bit wide tubes, your computer needs to be thinking in 64-bit so your software and hardware all need to support 64-bit.

If you do not know the difference between 32-bit and 64-bit, I would have told you in the past that you are running a 32-bit version of Windows. But now with Windows 7 I am seeing more and more 64-bit operating systems shipped by default without the end users knowledge. Don’t get me wrong, a 64-bit system is better but you also need to be running 64-bit programs and have a 64-bit processor or else all the trouble of setting up the 64-bit operating system would be worthless.

On a 32-bit operating system, you are restricted to a maximum of 3 gigabytes of RAM. On a 64-bit operating system, you really do not have a limit. Let’s look at Wikipedia and find out the maximum amount of RAM for a 64-bit operating system:

2⁶⁴ addresses, equivalent to approximately 17.2 billion gigabytes, 16.3 million terabytes, or 16 exabytes of RAM.

That is a huge amount of RAM! Normally when you exhaust your physical RAM on a 32-bit system, it has to use virtual memory or hard disk space to pick up the slack. On a 64-bit system, you can install as much RAM as you can to cover your overhead. From here on, 32-bit operating systems will be referred to as x86 and 64 bit operating systems as x64. You can tell what you are running by right clicking on My Computer and choosing Properties.  Below is a shot of a 64-bit machine using 12GB of memory.

 

And in this shot, we see a 32-bit machine trying to use 7GB of RAM.. Not going to happen!

 

If you are running 3D modeling systems or AutoCAD systems, you can benefit from a x64 bit architecture but remember, you need to be running ALL x64 applications, print drivers and anything else you are setting up on your system to realize its full potential. Not all programs have been created for x64 yet and you will find yourself installing applications to your Program Files x86 directory. On a x64 machine, you will have two Program File directories — one for 32-bit and one for 64-bit applications.
So after reading through that and you still want to run a x64 operating system, you will need to make sure your processor supports x64. Most new servers and new computers bought this year or beyond will support x64 but you will still need to check. Here are some facts you should know:

• Almost all new servers sold within the last two years from AMD or Intel will have x64 capability.
• Most mid- to high-end desktop processors from AMD or Intel within the last year have x64 capability.
• Some higher-end Semprons have x64; lower-end Semprons do not.
• No AMD Durons have x64.
• All AMD Opteron processors have x64.
• All AMD X2, FX, and Athlon64 chips have x64.
• All Intel Pentium D and Celeron D chips have x64.
• All AMD Turion notebook processors have x64.
• All Intel Core 2 processors (mobile, desktop, and server) have x64.
• No Intel Core Duo notebook processors have x64
• No Intel Pentium M notebook processors have x64.

If you are still not sure if your processor can support x64 check out GRC’s SecurAble and let them help you figure it out! You might also want to check out Mahendra’s post How To Choose Between 32-bit & 64-bit Windows 7 Operating Systems.

If you are running a server that has all its hardware and software certified for x64, then you should install the 64-bit version but beware of device drivers and any 32-bit environments because if I used the word difficult, it would be an understatement!

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What is Compiler ?

Definition of Compiler :

1. A computer program which reads source code and outputs assembly code or executable code is called compiler.
2. A program that translates software written in source code into instructions that a computer can understand Software used to translate the text that a programmer writes into a format the CPU can use.
3. A piece of software that takes third-generation language code and translates it into a specific assembly code. Compilers can be quite complicated pieces of software.

Compiler Overview :

Consider process of Executing Simple C Language Code –

We have opened C Code editor and wrote simple C Program , Whenever we try to compile code and try to execute code our code is given to the compiler.

int main()
{
printf("Hello");
return(0);
}

Now our main intention is to convert program into lower level language which can be read by Machine. Compiler have different phases , and program undergoes through these 6 phases. After Passing through all the compilation Phases our code is converted into the machine level language code which can be read by machine.

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What is Layer in Photoshop?

Layers are like stacked, transparent sheets of glass on which you can paint images. You can see through the transparent areas of a layer to the layers below. You can work on each layer independently, experimenting to create the effect you want. Each layer remains independent until you combine (merge) the layers. The bottommost layer in the Layers panel, the Background layer, is always locked (protected), meaning you cannot change its stacking order, blending mode, or opacity (unless you convert it into a regular layer).

About the Layers panel

The Layers panel (Window > Layers) lists all layers in an image, from the top layer to the Background layer at the bottom. In Expert mode, if you are working in the Custom Workspace, you can drag the Layers panel out and tab it with other panels.

The active layer, or the layer that you are working on, is highlighted for easy identification. As you work in an image, it’s a good idea to check which layer is active to make sure that the adjustments and edits you perform affect the correct layer. For example, if you choose a command and nothing seems to happen, check to make sure that you’re looking at the active layer.

Using the icons in the panel, you can accomplish many tasks—such as creating, hiding, linking, locking, and deleting layers. With some exceptions, your changes affect only the selected, or active, layer, which is highlighted.

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