It either will or it won't, regardless, there is no way to change it in the Dell BIOS so who cares??

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@Lawrence0603 wrote:

Hi All,

SiSoft Sandra 2004 kindly informs me that the 120gb Serial ATA HD in my Dimension 8300 is running on UDMA Mode 5 and that the maximum mode is UDMA-6.

Does anyone know if the bus and the hd in the 8300 does indeed support UDMA-6 and if so, can I step it up a bit?

(To be honest, I didn't even know that UDMA-6 existed till Sandra told me so, I sure didn't think it had been implemented software wise yet and I'm reading some places on the net that there is no noticable performance increase going from UDMA-5 to UDMA-6. If anyone can shed any light on the matter.....)

Thanks!!

-Lawrence.

No Dell machine supports UDMA - 6.  There is no performance gain, either noticeable or not, going from 5 to 6 (100 to 133).