pURCHASING A cOMPUTER
HERE ARE SOME IMPORTANT THINGS TO CONSIDER WHEN BUYING A COMPUTER!
bIT(b)
The smallest unit of storage on a digital device. Bit= {0,1} (0- off, 1-on) 010111001001, digital means 0's and 1's. 2 possible bits, 0 and 1. |
Byte(B)
Characters (called "bytes". Could contain 8 bits), "A"=01000001 |
Conveersion Table1,2,4,8,16 and just x2.
1000B= 1KB, K- Kilo, B-Byte. 1000KB= 1MB, M-mega, B-Byte. 1000MB= 1GB, G-Giga, B-Byte. 1000GB= 1TB, T-Tera, B-Byte. Our chart stops there, but there is a PB- Petabyte. |
><= 32GB ? 32KB
32GB > 32KB 32000MB 32000000KB 32KB 25000MB ? 25GB 25000MB = 25GB 160TB ? 900GB 160000GB 900GB 160TB > 900GB |
><=8MB ? 8GB
8MB < 8000MB 800GB ? 1TB 800GB < 1000GB |
conveersion Table 2(messy)1000B= 1KB, K- Kilo, B-Byte.
1,000,000=1000KB= 1MB, M-mega, B-Byte. 1,000,000,000=1000MB= 1GB, G-Giga, B-Byte. 1,000,000,000,000,= 1000GB= 1TB, T-Tera, B-Byte. |
How MAny?
16GB ipod, how much MB? How many songs if each song is 5MB?
16GBx10000=16000MB song/5MB.... 3200 songs can fit on. |
160GB ipad
movies/2GB so, 80 movies can fit. |
3TB t.v movie/4GB
3000GB 4GB 750 movies |
Conversion (Speed)
1000 Hz = 1 KHz 1000 KHz = 1 MHz 1000 MHz = 1GHz 1000 GHz = 1 THz |
Speed (Hz)
We measure how fast a computer "thinks" using Hertz (Hz) . Hz measures freguency of math questions. (math questions with 0 and 1) Frequency = Cycles/Second = Math Questions/Second |
How many math questions/second is 1.8 GHz?
1800MHz 1800000KHz 1800000000Hz |
How many math questions/second is 2.5GHz?
2500MHz 2500000KHz 2500000000Hz |
hdd- hard disk driveStore anything that is saved and opened after power on.
5400 RPM (rotations per minute) = 90 RPS (rotations per second) |
ssd- solid state driveno moving parts, smaller and a lot lighter. but has less storage.
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Random access memory,Holds working information, when the power goes out, then RAM is empty. (As long as there is power, it works fine)
RAM is most important to upgrade. |
chipvery, very fast.
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hdd(Spins fast but) slow
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ram(Hold running programs and holds work in progress) fast
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DDR3
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price- beware the fine print (your going to have to add tax)
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Network-Assume network jack
- CAT 5 -Wireless -only if mobile. ei. if laptop or tabet - WiFi (know) -802.11 groups: a b 5.6GHz 2.4GHz a,near but fast.b,far but slow b, can go through walls, they found ways to make it faster the "g" then the "n". |
Display-measured diagonally
- gives a bigger number. |
Other- 3 to 4 items
- warranty -graphics card (AMD, ATI, nVidia) - built-in web cam -HDMI -Bluray -keyboard & mouse -printer -operating system |