| Some PCIe questions [message #79321] |
Wed, 31 January 2007 10:05  |
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Deej [4]
Messages: 1292
Registered: January 2007
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So I hear the PCIe bus can handle 500MHz whereas our wimpy ass PCI =
busses can only go 133.
I also hear that the PCIe bus doesn't share any bandwidth at all with =
the PCI bus.
Taken from a post on another forum:
PCIe guarantees a certain amount of undivided=20
bandwidth to a device in the PCIe slot. It's a dedicated channel. On a=20
modern Intel Chipset like the 965 there will be some contention between=20
devices on the south bridge chip (USB2, LAN, Serial ATA disks, PCIe) but =
the bandwidth between the north and south bridge chips is quite high=20
relative to the bandwidth of the south bridge devices.
So I'm wondering what this means exactly? Does it mean that there is =
enough bandwidth to hang 7 x PCI cards in a 7 x Slot Magma chassis and =
not have to worry about IRQ sharing, especially if there is a PCIe =
graphics card in the equation?.........and of course, something like =
this gets the hampsters jumping on the wheel in my brain and my brain =
comes up with a way to potentially make a computer perform an unnatural =
act by using a PCI video card on the PCI bus since that bus doesn't =
share with anything else, thus eliminating any possibility of problems =
down the road with a graphics card.
......the stated conclusion from the other forum........
The bottom line is that a PCIe device with hard real time requirements=20
(like a multiport audio device) will have fewer problems maintaining=20
stable audio input and output.
........so there is morepotential to poperate a native system at lower =
latencies???
C'mon folks, step up to the mic and talk to me here.
;o)
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<DIV><FONT face=3DArial size=3D2>So I hear the PCIe bus can handle =
500MHz whereas=20
our wimpy ass PCI busses can only go 133.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I also hear that the PCIe bus doesn't =
share any=20
bandwidth at all with the PCI bus.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Taken from a post on another =
forum:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><EM><STRONG>PCIe guarantees a certain =
amount of=20
undivided <BR>bandwidth to a device in the PCIe slot. It's a dedicated =
channel.=20
On a <BR>modern Intel Chipset like the 965 there will be some contention =
between=20
<BR>devices on the south bridge chip (USB2, LAN, Serial ATA disks, PCIe) =
but=20
<BR>the bandwidth between the north and south bridge chips is quite high =
<BR>relative to the bandwidth of the south bridge=20
devices.</STRONG></EM></FONT></DIV>
<DIV><FONT face=3DArial =
size=3D2><EM><STRONG></STRONG></EM></FONT> </DIV >
<DIV><FONT face=3DArial size=3D2>So I'm wondering what this means =
exactly? Does it=20
mean that there is enough bandwidth to hang 7 x PCI cards in a 7 x Slot =
Magma=20
chassis and not have to worry about IRQ sharing, especially if there is =
a PCIe=20
graphics card in the equation?.........and of course, something like =
this gets=20
the hampsters jumping on the wheel in my brain and my brain comes up =
with a way=20
to potentially make a computer perform an unnatural act by using a PCI =
video=20
card on the PCI bus since that bus doesn't share with anything else, =
thus=20
eliminating any possibility of problems down the road with a graphics=20
card.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>.....the stated conclusion from the =
other=20
forum........</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><STRONG><EM>The bottom line is that a =
PCIe device=20
with hard real time requirements <BR>(like a multiport audio device) =
will have=20
fewer problems maintaining <BR>stable audio input and=20
output.</EM></STRONG></FONT></DIV>
<DIV><FONT face=3DArial =
size=3D2><STRONG><EM></EM></STRONG></FONT> </DIV >
<DIV><FONT face=3DArial size=3D2>.......so there is morepotential to =
poperate a=20
native system at lower latencies???</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>C'mon folks, step up to the mic and =
talk to me=20
here.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>;o)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> </DIV>
<DIV><STRONG><BR></STRONG></DIV></FONT></BODY></HTML>
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