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Old Jul 6, 2002, 08:14 AM   #1
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Default Post APIC Mode??? What is that?

I just got a new Abit KX7-333 motherboard and I see that there is a setting to enable/disable in the BIOS called APIC Mode. Does anyone know what that does? Should I enable it or disable it?

I hope the Abit dude is reading this....
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Old Jul 6, 2002, 08:55 AM   #2
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apic = advanced programmable interrupt controller or something to that effect...

i think it is for managing the interrupts on a multiprocessor system...but if you only have a single cpu enabling can improve performance.
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Old Jul 6, 2002, 08:58 AM Threadstarter Thread Starter   #3
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Default Post Re:

Quote:
Originally posted by sinjin
...but if you only have a single cpu enabling can improve performance.
Enabling will improve???? Is that a typo?
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Old Jul 6, 2002, 09:01 AM   #4
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yea i think so...it enables 24 lines of interrupt request lines rather than 16 (or something like that)...there has to be documentation on this somewhere...
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Old Jul 6, 2002, 09:07 AM   #5
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key benefits of I/O APIC
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Old Jul 6, 2002, 09:58 AM Threadstarter Thread Starter   #6
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I had it diabled by default.....however, when I enable it and save settings to reboot....nothing happens! Just a black screen. I go back to disable it and save/reboot and everything works again.....don't tell me I have to reformat to enable this setting...
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Old Jul 6, 2002, 10:14 AM   #7
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changing between enabled and disabled APIC mode may require you to reinstall Windows to allow a different hardware access layer to be used...
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Old Jul 10, 2002, 12:35 PM   #8
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No, as far as I am concerened, you MUST re-install Windows. I've tried it before.

And as for me, I now always leave APIC on. You do get better performance and more IRQs.
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Old Jul 16, 2002, 03:55 AM   #9
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not to be contradictory but I read twice to disable APIC. sorry don't have any links but just would recommend more info on the subject before reformatting....
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Old Jul 16, 2002, 06:46 AM   #10
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You have to reformat either way, to avoid hosing your system.

Don't get confused with ACPI and APIC. ACPI is the standard for power saving, etc. etc. etc. implemented by Microsoft, which you will find in Windows. Go ahead. In you device manager, you will see that all your devices use one IRQ. THAT IS CALLED ACPI.

APIC is an option in your BIOS that stretches your IRQs from the standard AT of 15 to about 23 or 24, so that all your devices don't use one IRQ. THAT IS APIC.
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Old Jul 16, 2002, 07:49 AM   #11
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Default Post Re:

Quote:
Originally posted by ajm786
Don't get confused with ACPI and APIC. ACPI is the standard for power saving, etc. etc. etc. implemented by Microsoft, which you will find in Windows. Go ahead. In you device manager, you will see that all your devices use one IRQ. THAT IS CALLED ACPI.
not to highjack the thread or anything but how do you disable ACPI in windows?
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Old Jul 16, 2002, 08:04 AM   #12
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n/m found out how here:
http://www.rage3d.com/board/showthre...eadid=33594824

also a bit of info on APIC in there too....
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Old Jul 17, 2002, 12:55 AM   #13
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Both ACPI _and_ APIC are good to have on. Don't disable either. Doing so only encourages the hardware manufacturers to make bad non-compliant hardware. You'll do TONS more work shuffling IRQ's (since despite APIC, in non-ACPI mode you only get 4 hardware-level interrupts - that's right ONLY 4!), and get almost no performance benefits. No matter what anyone told you, ACPI = GOOD.

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Old Jul 24, 2002, 06:27 AM   #14
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Default Post Re:

Quote:
Originally posted by Gurm
Both ACPI _and_ APIC are good to have on. Don't disable either. Doing so only encourages the hardware manufacturers to make bad non-compliant hardware. You'll do TONS more work shuffling IRQ's (since despite APIC, in non-ACPI mode you only get 4 hardware-level interrupts - that's right ONLY 4!), and get almost no performance benefits. No matter what anyone told you, ACPI = GOOD.

- Gurm
I agree with you on this one and by one hundred and fifty percent. Removing ACPI changes your OS kernel extensively and you may be left with a lot of features missing e.g. UDMA on your IDE drives etc because your IDE controller is trying to share the IRQ with your graphics card. (Well it did happen to me.. in fact I lost my 2ndary IDE altogether!... had to do a full format to fix it).

Once you disable ACPI from the BIOS and then the OS you cannot 'simply' turn it back on. Even with a system restore point set you may run into problems.

APIC though is slightly different as previously mentioned.
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Old Jul 24, 2002, 07:50 AM   #15
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For some reason or another APIC made my system unstable. I did reistall windows after enabling it (actually I just enabled APIC right before I had to reinstall anyway), but had random lockouts afterwards. Everything's stable again now that I've disabled it. And I didn't have to reinstall Windows (XP) this time.
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Old Jul 24, 2002, 04:47 PM   #16
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From my understaning, APIC is quite useless unless you have more than on cpu.
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Old Jul 31, 2002, 10:25 AM   #17
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Default Post Re:

Quote:
Originally posted by Gurm...
Both ACPI _and_ APIC are good to have on. Don't disable either. Doing so only encourages the hardware manufacturers to make bad non-compliant hardware....
Um-hum - so I should trash-can my nVidia GF2 because it shares an interrupt with the LAN card in Win2k and I can't tell Win2k to assign it a unique IRQ when ACPI is enabled on a new install? I guess I can then take my chances on buying a new $400 nVidia card and hope that the drivers and hardware for this rather critical piece of hardware aren't "bad non-compliant" crashing and stuttering additions to my system?

Or, should I install as a Standard PC, spend 10 minutes assigning IRQ's and have a smooth running system with my existing GF2?

ACPI is the savior of MIS system integrators - makes installation and support a breeze. This is because, in a coporate environment any employee to tries to push their system with games or other 3D applications is rarely tolerated.

But for a gaming enthusiast, I can either spend beau-coup bux on the latest and greatest, then pray a LOT, and struggle with drivers and PCI slots and HOPE everything runs well when the system is stressed - or - Standard PC. Never say never and never say always
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