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Difference Between Buy and Purchase

Purchase is considered more formal than buy and is a word used more in contractual agreements than buying an ice-cream or a mobile from the market.

Purchase is used to refer to a contractual agreement such as purchase of property or a purchase order from a company to a supplier. You do not buy land; you purchase it along with an agreement. This means that you purchase everything but you do not buy everything.

Then there are differences pertaining to usage of these two words. For example, government always places purchase orders, and never buys. The government has decided to purchase anti missile tanks from the US.

Difference Between Dual Core and Quad Core �rocessor

Dual core and quad core are two processor types that fall in to the category of multi core processors. In a multi core processor, there is more than one core (processor) in the single integrated circuit die. A dual core processor has two cores in the same die and a quad core processor has four cores in the same die. Multi core processors are widely used in general purpose computers, embedded devices, network devices, etc. To get the best use of multi core processors, the software programs running on the system should be implemented in such a way that they are able to get the full use of the multi core setup.

Difference Between SD, DDR, DDR2 and DDR3 RAMs

SD, DDR, DDR2 and DDR3 are all different types of RAM (Random Access Memory). RAM is a kind of computer memory that temporarily stores information, improving your systems performance. Or in other words RAM simply holds data for the processor. The processor also has its own memory known as the L2 cache, the cache lies between the processor and the RAM. The processor sends and retrieves data from this cache, when this cache overflows data is sent to the RAM.

There are mainly four types of RAM; SD, DDR, DDR2 and DDR3. They differ in the way they operate and mainly in their operation speeds. All RAM's used in computers today have a synchronous interface meaning they wait for a clock signal before it can respond to clock signals.

SD RAM:

SDRAM stands for synchronous dynamic random access memory. SDRAM is Single Data Rate meaning that SDRAM can accept one command and transfer one word of data per clock cycle. As mentioned above SDRAM's have synchronous interface therefore they depend on the computer clock signals to perform operations. Typical speeds of SDRAM are 100 and 133 MHz.

DDR SDRAM:

DDR SDRAM stands for double data rate synchronous dynamic random access memory. DDR RAM transfers data twice per clock cycle, hence the name double data rate. DDR clock speeds range between 200 MHz (DDR-200) and 400 MHz (DDR-400). DDR-200 transfers 1600 MB/s, while DDR-400 transfers 3200 MB/s.

DDR2 SDRAM:

DDR2 SDRAM stands for double data rate 2 synchronous dynamic random access memory.DDR2 is twice as fast as DDR which means twice as much data is carried to the module for each clock cycle. Also due to the design improvements DDR2 consumes less power as compared to the DDR memory. DDR2 speeds range between 400 MHz (DDR2-400) and 800 MHz (DDR2-800). DDR2-400 transfers 3200 MB/s. DDR2-800 transfers 6400 MB/s.

DDR3 SDRAM:

So by now after reading the above it is quite obvious what DDR3 SDRAM stands for, double data rate 3 synchronous dynamic random access memory. In theory DDR3 is supposed to act twice as fast as DDR2 memories. Thus DDR3 speeds range between 800 MHz (DDR3-800) and 1600 MHz (DDR3-1600). DDR3-800 transfers 6400 MB/s; DDR3-1600 transfers 12800 MB/s.

Only gamers may notice the difference between DDR2 and DDR3 speeds, while for everyone else, even DDR will be sufficient. But if you are buying a new PC spending a little extra for the increased speed is always appreciated.

But in the end it all depends on your requirements and your budget. DDR3 will cost a lot more than DDR2, also for DDR3 speeds you will also need a motherboard that can support it, so if you are planning on upgrading your RAM to DDR3 you should be certain that your motherboard can support it. If your requirements do not involve heavy gaming or video editing and video processing then you have no need for the powerful DDR3 memory.

Difference Between Google Earth and Google Map

• Google Earth is a desktop application while Google Maps is a web application.

• Google Earth has to be installed on the computer and can only be accessed through that computer while Google Maps can be viewed through any web browser without any restriction of the OS or additional software.

• Google Earth is presented as a 3D globe, and Google Maps is presented as a Mercator`s projection.

• Google Earth uses fly-by when transitioning from one location to another.

• Google Earth has extra-terrestrial maps (Moon, Mars, and Sky), and Google Maps do not have this feature.

• Up to a certain level, both applications provide the same functionalities, but the tools used are different.

• Google Earth is advanced and has more features and tools for navigation.

• Google Maps is completely freeware, but Google Earth is only partly freeware. There is no license or fee required for the basic version, but those are required for the Pro version which offers more functionality.

Difference Between WIFI and LIFI

In WIFI, modulated signal is radio wave where as LIFI modulated signal is light. It is visible electromagnetic spectrum and has higher bandwidth than WIFI but has Line of sight limitation.

Difference Between SSDs and Hard Drives

Hard drives have been the storage medium of choice for a very long time due to its very high capacity and endurance. Data on a hard drive is stored on metal discs called platters which are spun around in order for the moving arm to read the magnetic data on the disc. The current emerging technology that has begun to compete with hard drives are Solid State Drives or SSDs. These store data in flash memory modules giving them a lot of advantages over hard drives.

The spinning platters and moving arms in a hard drive create a lot of unwanted problems that are not present in SSDs. The first of which is the power consumption. Converting electrical energy into mechanical energy always consumes a lot of power and creates heat as a byproduct. The moving parts also make hard drives susceptible to impact damage. SSDs do not suffer from these problems because it doesn’t have moving parts making it ideal for laptops and other mobile devices.

The speed at which data is read and written from the drive is a very significant factor for drives. In this aspect, the SSD also wins by a large margin since it acts just like the RAM in your computer. Data is readily written and read from an SSD unlike in a hard drive where the arm needs to be positioned to the right spot then wait for the platter to turn enough so that the arm can read the data.

The limiting factor in the general proliferation of SSDs at the moment is its price. SSDs are a lot more expensive compared to hard drives per gigabyte of storage, though the advantages are outweighing the cost in mobile devices like laptops. SSDs also suffer from a limited number of writes before a certain memory element fails. This is a trait shared by all flash based memory, although the specific number of writes before failure can vary from one device to another. Manufacturers combat this by a method called wear leveling, where they find the least often used portion of memory to write new data to. This allows the drive to survive a lot longer and the individual memory elements to fail at roughly the same time.

Summary:

1. SSDs have no mechanical parts like hard drives do.

2. SSDs can achieve much faster speeds compared to a hard drive.

3. SSDs can sustain a lot more force from impact compared to hard drives.

4. SSDs consume less power than hard drives.

5. SSDs have a very limited number of writes before it fails.

6. SSDs are more expensive than hard drives.

Difference Between Guys and Males

Guys and men are basically adult human males. They are differentiated from each other by certain traits which are not written in some book but are personal opinions of people. Boys who grow up to be less responsible and more fun; who take jobs rather than build careers, and have not yet decided to commit seriously to relationships or a career are guys; whereas, boys who grow up to become responsible and settle in life are considered to be men.