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AMD Motherboards & CPUs Questions or comments on AMD products?


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  #1 (permalink)  
Old 17th August, 2002, 07:27 AM
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8K7A+ : When exactly does it use the 1/5 divider?

Can anyone tell me for sure what is the lowest FSB that the board will use 1/5 pci divider?

I searched everywhere and some people say the 8k7a chooses 1/5 divider at 160 fsb, others say 166fsb, others say 167, etc...

Also, is a Topower 350W power supply good enough for this board? I need a cheap replacement for my Enermax 300w.
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Old 17th August, 2002, 10:37 AM
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Every thread I've read said it kicks in above 166mhz using the 8K7A/8K7A+ BIOS 7.11
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Old 17th August, 2002, 02:18 PM
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I didn't know an AMD chipset allowed 1/5. Is it possible you are refering to the 8K3A+, w/ KT333 chipset? Just curious.
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Old 17th August, 2002, 03:48 PM
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These threads give pretty convincing evidence that the 1/5 divider kicks in at 160:

oscilliscope 1/5 @ 166

I don't reckon the 1/5 dividers on 8KHA+ is activated

(the 2nd thread is talking about the 8KHA, but it uses the same pll as the 8k7a).
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Old 17th August, 2002, 05:11 PM
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Deviders are inplemented by the chipset on the board, regardless of what the PLL is cablable of.

If the chipset dosent support a 1/5 drvider then there wont be one.
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Old 17th August, 2002, 05:42 PM
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Epox already claimed that the latest BIOS (after 1711) for the 8K7A supports the 1/5 multiplier "automatically."

Do you have any proof that 1) the 761 chipset does not support the 1/5 divider and 2) the chipset must support the 1/5 divider regardless of the pll?
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Old 17th August, 2002, 06:41 PM
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Quote:
Originally posted by some1x
Epox already claimed that the latest BIOS (after 1711) for the 8K7A supports the 1/5 multiplier "automatically."

Do you have any proof that 1) the 761 chipset does not support the 1/5 divider and 2) the chipset must support the 1/5 divider regardless of the pll?
I guess he don't know about you 'Holst"
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Old 17th August, 2002, 08:17 PM
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Quote:
Originally posted by some1x
Epox already claimed that the latest BIOS (after 1711) for the 8K7A supports the 1/5 multiplier "automatically."

Do you have any proof that 1) the 761 chipset does not support the 1/5 divider and 2) the chipset must support the 1/5 divider regardless of the pll?
I dont have the specs for the 8k7a or AMD761 chipset at home with me so id have to sait untill monday to answer that one. Maybee ET will read it as he will know better than me.

As for the two threads you posted about the 8kha+ my previous answer is all I can say im afraid.
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Old 17th August, 2002, 08:54 PM
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Quote:
Originally posted by Holst
Deviders are inplemented by the chipset on the board, regardless of what the PLL is cablable of.

If the chipset dosent support a 1/5 drvider then there wont be one.
That very well may be true, but if so, then I have a question for you.

I have an Asus P2B-DS 1.06 d03 (440BX chipset). This was the last revision of the board, and it has a 1/4 PCI divider at 133 fsb. If the divider truly is implemented by the chipset, then how can this board possibly have a 1/4 divider as it is a 440BX chip?

Or is this different as it's not an AMD chipset?

Anyways, it just kinda perked my curiosity.
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Old 17th August, 2002, 09:01 PM
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I havent been able to find on on my board, and i can confirm that because when i am running NTFS my harddrive wont run over 155fsb. I would be willing to try other bios versions though, i am currently using the latest one, 25.29. I may try the 17.11 bios again if that one may have the divider.
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Old 17th August, 2002, 09:04 PM
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Many 440BX based boards had 133fsb support.

I was realy refering to modern VIA AMD motherboards.
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Old 17th August, 2002, 09:06 PM
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Quote:
Originally posted by Holst
Many 440BX based boards had 133fsb support.

I was realy refering to modern VIA AMD motherboards.
No doubt they did.
I have an EPoX KP6-BS (another 440bx) and this too has 133 fsb capability.

However, my question was about the 1/4 PCI divider, and AFAIK my EPoX lacks this while the Asus board has it.

And above all else, it was a question about the divider actually being determined by the chipset, and not by some component external to the chipset.
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