Hardware FAQ

mycomnet — Wed, 21 Apr 2004 01:28:13 +0800

FAQ about hardware

What is the speed of usb 2.0?
Below is the summazired speed for some common transfer protocol

Protocol : Transfer rate(MB/s)
IrDA-Control : 0.009
Serial : 0.02
Parallel : 1.0
Bluetooth 1.1 : 0.125
Bluetooth 2 : 2 to 12
IEEE 802.11 : 0.25
IEEE 802.11a : 6.75
IEEE 802.11b : 1.375
IEEE 802.11g : 6.75
USB 1.1 : 1.5
USB 2.0 : 60
SCSI 1 : 5
Fast SCSI 2 : 10
Fast Wide SCSI 2 : 20
Ultra SCSI : 20
Ultra Wide SCSI : 40
Ultra2 SCSI : 80
Ultra 160 SCSI : 160
FireWire (IEEE 1394) : 50
FireWire (IEEE 1394b) : 100
Ultra DMA ATA 33 : 33
Ultra DMA ATA 66 : 66
Ultra DMA ATA 100 : 100
Ultra DMA ATA 133 : 133
SATA : 150
SATA 2 : 375
PCI : 132
PCI-X (64bit) : 1.1 GB/s
PCI Express x1 : 250
PCI Express x16 : 4 GB/s
PCI Express x32 : 8 GB/s

Can I use ATI card on SLI mobo?
Yes you can. Note that it will not behave as SLI mode if you plug in 2 of ATI cards.

Can I put a pci-e graphic card in agp slot?
No you can't because the the slot is different.

My mobo only support DDR266. Can i put DDR400 in my mobo?
Yes you can but the DDR400 will become DDR266.

My hard disk is a 80 Gb model, why do I only have 74Gb avaible?
Hard disk manufacturers consider one Kilobyte is equal to 1000 Bytes, one Megabyte is equal to 1000 Kilobytes and one Gigabyte is equal to 1000 Megabytes. This is, however, not true. The real values are one Kilobyte is equal to 1024 Bytes, one Megbyte is equal to 1024 Kilobytes (1048576 Bytes) and so on. So if you're has 80 000 000 000 Bytes, hard disk manufacturers say it is an 80 Gb Hard Disk where as it really has only 74.5 Gb.

For quick reference I have made a simple table:
20 Gb - 18.62 actual Gb
40 Gb - 37.25 actual Gb
60 Gb - 55.87 actual Gb
80 Gb - 74.5 actual Gb
100 Gb - 93.13 actual Gb
120 Gb - 111.75 actual Gb
160 Gb - 149.01 actual Gb

I have two sticks or RAM that are the same model, same speed and same make(i.e.Kingston DDR400 512MB x2). Can i run both as dual-channel?
Yes, you can. Make sure that your mobo supports dual-channel and also the speed of your RAM.

edited by acedriver, credit to everyone who contribute to this thread, some posts need to be deleted..

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