UDMA 66 how much faster is it?

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mred Posted: Fri, Apr 14 2000 5:14 AM
Hi guys,

Ive got a ABIT BX6 motherboard and 2 * IBM Deskstar 10GB hard disks, P2 400. At the moment im using a standard IDE cable, could someone please tell me what is the highest UDMA this would support and how much faster it would be if i used a cable which supported UDMA 66.

Many thanks

Mr ED
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Pinski replied on Tue, Apr 25 2000 6:54 PM
well with your motherboard, you will only get UDMA33 so it's worthless to buy that cable, if on the otherhand you had a PCI card that did UDMA66, and your drives support UDMA66, it would theortically double the speed of transfers.
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I haven't noticed a huge difference. Not that I would want to go back, either, but it isn't that noticeable.

[This message has been edited by reaper450128 (edited 05-13-2000).]
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pennyman replied on Tue, May 30 2000 9:46 AM
With your setup, you could get a UDMA 66
controller, but your drives are still running at 5400 or 4500 RPM. UDMA 66 is about 3 percent faster than a UDMA 33 drive. What you want is a 7200RPM drive(which also has 2 meg cache vs 128-512 with your current drive).

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namhngo replied on Tue, May 30 2000 8:34 PM
If you read around, you'll see that at the moment there is no tangible benefit in going from UDMA33 to UDMA66. Most drives (your IBM Deskstars included) are incapable of transfering data past the UDMA33 spec. I think the fastest IDE drives are approaching the 30MB/sec transfer rates (notably the Seagate Barracuda ATA drives). The Promise 66 card will give your Abit BX6 board compatibility with UDMA66 but I don't think that you will see any performance improvement.

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If your mobo support UDMA-66, your HDD are UDMA-66 and you have UDMA-66 cable.
The performance is excellent.
In SiSoft Sandra 99, the value is up from
8xxx to 13xxx and even more (with my Gigabyte i820 - P3 533, Quantum lct10 30,2Gb)
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