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Old 09-05-2005, 02:24 PM   #1
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Default Everything You Need to Know About the PCI Express

There has been a new article posted.

Title: Everything You Need to Know About the PCI Express
URL: http://www.hardwaresecrets.com/article/190

Here's a snippet:
"Since the first PC, launched in 1981, the computer has had expansion slots where you can install additional cards to add capabilities not available on the motherboard of the computer..."

Comments on this article are welcome.

Last edited by Gabriel Torres; 07-13-2012 at 12:55 PM.
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Old 09-08-2005, 03:47 AM   #2
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Default X1, X4, cards and sockets, are they interchangable?

Clearly it is not possible to plug a X4 or X16 card into an X1 socket, but is it possible to plug a smaller card into a larger socket?
ie. plug an X1 card into a X4 or X16 socket?

Cheers.
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Old 09-09-2005, 10:52 AM   #3
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Yes you can, PCIe is compatable as long as the co-efficent of the x is lower on the card then the co-efficent of x on the slot you wish to use. Thus a 1x card would fit in a 1x, 4x, 8x, or 16x slot.

A 1x slot will fit only 1x cards
A 4x slot will fit only 1x, and 4x cards
A 8x Slot will fit only 1x, 4x, and 8x cards
A 16x slot will fit only 1x, 4x, 8x, and 16x cards
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Old 07-12-2012, 07:19 PM   #4
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Nice article, seemingly basic information, but the important details are often overlooked or unknown, thanks for providing them.

Question for you, video cards in PCIe connections seem to be able to reduce their transmission speed over each lane to save power during low load conditions, such as from 5Gb/s to 2.5Gb/s in PCIe 2.0.

Who or what is actually in control, the device connected to the PCIe lane(s), the mother board/chips that provide the PCIe connections, an Operating System, the PC user, or...?

I've seen add-on cards that say they are PCIe 2.0 compliant, but seem to operate at PCIe 1.0 speed (2.5Gb/s), as reported by a PC hardware monitoring program, given a PCIe 2.0 compliant mother board connection.
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Old 07-13-2012, 12:57 PM   #5
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Hi,

Either the video card or the PCI Express controller can negotiate a lower speed.

Thanks,
Gabriel.
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Old 07-15-2012, 11:41 PM   #6
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Quote:
The 16-bit version of the ISA, launched with the IBM PC AT in 1984, almost doubled the available bandwidth to 8 MB/s (8 MHz transferring 16 bits per clock cycle), [...]
Wouldn't it be 16 MB/s?
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Old 07-16-2012, 08:20 AM   #7
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No, because each transfer on the ISA bus takes two clock cycles.
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Old 07-17-2012, 10:39 PM   #8
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Ok, I'm sorry to bother you again but, in that case, wouldn't it be something like
Quote:
8 MHz transferring 16 bits every two clocks
or so?

I find quite confusing
Quote:
8 MHz transferring 16 bits per clock cycle
and
Quote:
No, because each transfer on the ISA bus takes two clock cycles.
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Old 07-18-2012, 06:36 AM   #9
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You are correct. It should read "access cycle" or something similar. I will correct this right away. Once again, thank you.
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Old 07-18-2012, 06:50 AM   #10
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You're welcome. Now it's perfect, thank you too for this kind of articles, they are quite enlightening.
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