Original Sender : Gargoyle <[EMAIL PROTECTED]>
---------------------------------
On Wed, 12 Jan 2000, you wrote:
> Original Sender : Dedhi <[EMAIL PROTECTED]>
> >ps: patch untuk VIA itu padahal 'kan supaya bisa pake Ultra DMA .
> >DMA dan Ultra DMA bedanya apa sih ? Kedengarannya yang ultra lebih
> >bagus ... tapi malah sebaliknya.
>
> AFAIK, standard DMA transfer itu jalan pada kecepatan 8-33 MHz, maintain
> compatiblity untuk ISA devices dan juga digunakan pada processor lama sejak
> jaman 8088 sampai 486.
> sedangkan UDMA jalan pada kecepatan FSB baru, jadi bisa 66,75, 83, 100 MHz.
Iya sih...UDMA jalan pada bus speed di atas 66. Di mobo gue juga fine2 aja
UDMA33 on 83. Tapi gue curious kenapa di Linux Ultra-DMA mini Howto kok
nggak dianjurkan overclock, alias jangan pake speed di atas 66 (/2 = 33).
Paling top di 75 (/2 = 37,5). As seen on the quote below...
============
9.2. Are you overclocking?
If you are, beware! Here is a quote from the udma-generic
documentation:
DON'T OVERCLOCK the PCI bus. 37.5MHz is the maximum supported speed for
the PCI bus. Some (supposedly compatible) UDMA drives will not even take
37.5MHz, but should be OK at 33.3MHz.
In any case, NEVER, NEVER set the PCI bus to 41.5MHz.
The RECOMMENDED safe setting is 33MHz.
============
So...
--
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