Slow Southbridge PATA on P4C800 E D

  • Thread starter Thread starter LM
  • Start date Start date
L

LM

Hi all

I have always wondered about strange look of the results from Hd tune
when I tested my PATA bootdisk. The speed curve is constant about
28MB/s, burst speed is also 28MB. The drive is Maxtor 6Y080P0 with 8MB
cache. Cable is ok. All caches and dma are on. Mode was udma2. Udma2?

I changed the drive to the Promise connector and speed results rised to
60-30MB/s. And the result is now a normal falling curve. Burst speed
rose also to some 100MB.

What is wrong there?

Regards
LM
 
LM said:
Hi all

I have always wondered about strange look of the results from Hd tune
when I tested my PATA bootdisk. The speed curve is constant about
28MB/s, burst speed is also 28MB. The drive is Maxtor 6Y080P0 with 8MB
cache. Cable is ok. All caches and dma are on. Mode was udma2. Udma2?

I changed the drive to the Promise connector and speed results rised to
60-30MB/s. And the result is now a normal falling curve. Burst speed
rose also to some 100MB.

What is wrong there?

Regards
LM
Click to expand...
28 MB/s burst (and other) speed is consistent with UDMA2. If the cable
is a good 80-wire IDE cable, check that it was correctly installed --
with the MB connector in the MB and the HD at the far end of the cable.

Also, you may want to download the diagnostic/utility from www.maxtor.com
to see if it finds anything bogus.
 
Bob said:
28 MB/s burst (and other) speed is consistent with UDMA2. If the cable
is a good 80-wire IDE cable, check that it was correctly installed --
with the MB connector in the MB and the HD at the far end of the cable.

Also, you may want to download the diagnostic/utility from www.maxtor.com
to see if it finds anything bogus.
Click to expand...

I checked the cable and its connections several times. No help.

Is Udma2 same as UltraDma100 Asus manual seems to give as Southbridge
Pata speed?

Regards LM
 
LM said:
Bob Willard wrote:



I checked the cable and its connections several times. No help.

Is Udma2 same as UltraDma100 Asus manual seems to give as Southbridge
Pata speed?

Regards LM
Click to expand...
UDMA2 = UDMA/33 = 33 MB/s. With 33.3 MB/s as the peak data rate, 28 MB/s is
about all you can get, even for burst speed as reported by HDtach.

And, that UDMA2 is, indeed, limiting your HD's performance. I don't
know why
it only gets U/33 instead of U/100. I note that my P4C800ED also reports
U/33 instead of U/100, but it doesn't matter for me since I only use that
channel for a DVD burner, and U/33 is good enough for that.
 
Bob said:
UDMA2 = UDMA/33 = 33 MB/s. With 33.3 MB/s as the peak data rate, 28 MB/s is
about all you can get, even for burst speed as reported by HDtach.

And, that UDMA2 is, indeed, limiting your HD's performance. I don't
know why
it only gets U/33 instead of U/100. I note that my P4C800ED also reports
U/33 instead of U/100, but it doesn't matter for me since I only use that
channel for a DVD burner, and U/33 is good enough for that.
Click to expand...

Strange. I wonder is there anyone who has this ide running at full
speed.

I cant find any drivers for Southbridge, what I found I updated.
Article "http://support.microsoft.com/?kbid=817472" mentioned slowing
hard disks, but the trick didnt help.

By the way, primary IDE seems to be 133MB/s type. And secondary 100M.
Why do you have DVD burner in primary IDE?

Regards LM
 
LM said:
Bob Willard wrote:



Strange. I wonder is there anyone who has this ide running at full
speed.

I cant find any drivers for Southbridge, what I found I updated.
Article "http://support.microsoft.com/?kbid=817472" mentioned slowing
hard disks, but the trick didnt help.

By the way, primary IDE seems to be 133MB/s type. And secondary 100M.
Why do you have DVD burner in primary IDE?

Regards LM
Click to expand...
My DVD burner is the only PATA widget on this PC. The HDs are SATA.
 
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