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alecv
мы не про карточки а про шину

Версии шины PCI типа FAQ. А то подеретесь есчо
http://www.nix.ru/support/faq/...r_number=0

До кучи:


[root@localhost user]# cat /proc/interrupts

           CPU0       CPU1
  0:   49838172          0    IO-APIC-edge  timer
  1:         73          0    IO-APIC-edge  i8042
  8:          0          0    IO-APIC-edge  rtc
  9:          0          0   IO-APIC-level  acpi
12:       8409          0    IO-APIC-edge  i8042
14:    1777274          0    IO-APIC-edge  ide0
50:     222679          0         PCI-MSI  eth0
169:          0          0   IO-APIC-level  uhci_hcd:usb4, CMI8738-SWIEC
217:          0          0   IO-APIC-level  uhci_hcd:usb3
225:     170655          0   IO-APIC-level  libata, uhci_hcd:usb2
233:          0          0   IO-APIC-level  uhci_hcd:usb1, ehci_hcd:usb5
NMI:   49838245   49838207
LOC:   49840364   49840437
ERR:          1
MIS:          0


Ok, понял.
У меня о звучке такая инфа:

01:01.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 10)
        Subsystem: C-Media Electronics Inc CMI8738/C3DX PCI Audio Device
        Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- >TAbort- >MAbort- >SERR- >PERR-
        Latency: 224 (500ns min, 6000ns max)
        Interrupt: pin A routed to IRQ 169
        Region 0: I/O ports at d700 [size=256]
        Capabilities: [c0] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-


Geners Ищем спецификации шины PCI версии 2.1
На http://www.pcisig.com , к сожалению, без членства ничего не дают, поэтому ищем открытые документы в сети, находим
http://alpha1.dyns.net/files/PCI/pci21.pdf
Chapter 7
66 MHz PCI Specification
7.1. Introduction
The 66 MHz PCI bus is a compatible superset of PCI defined to operate up to a
maximum clock speed of 66 MHz. The purpose of 66 MHz PCI is to provide
connectivity to very high bandwidth devices in applications such as HDTV, 3D graphics,
and advanced video. The 66 MHz PCI bus is intended to be used by low latency, high
bandwidth bridges and peripherals. Systems may augment the 66 MHz PCI bus with a
separate 33 MHz PCI bus to handle lower speed peripherals.
Differences between 33 MHz PCI and 66 MHz PCI are minimal. Both share the same
protocol, signal definitions, and connector layout. To identify 66 MHz PCI devices, one
static signal is added by redefining an existing ground pin, and one bit is added to the
Configuration Status register. Bus drivers for the 66 MHz PCI bus meet the same DC
characteristics and AC drive point limits as 33 MHz PCI bus drivers; however, 66 MHz
PCI requires faster timing parameters and redefined measurement conditions. As a
result, 66 MHz PCI buses may support smaller loading and trace lengths.
A 66 MHz PCI device operates as a 33 MHz PCI device when it is connected to a
33 MHz PCI bus. Similarly, if any 33 MHz PCI devices are connected to a 66 MHz PCI
bus, the 66 MHz PCI bus will operate as a 33 MHz PCI bus.
The programming models for 66 MHz PCI and 33 MHz PCI are the same, including
configuration headers and class types. Agents and bridges include a 66 MHz PCI status
bit.
И что мы видим? поддержка 66 мегагерц описывается в конце, то есть практически как extention, отдельный подстандарт. Да, в разъеме PCI есть ключ, отвечающий за поддержку 66 мегагерц шины, но на то и есть унификация разъема, я повторюсь, 33 мегагерц и 66 мегагерц для PCI шины параллельные стандарты.