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A8V Bios Help

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September 13, 2004 10:13:47 AM

Archived from groups: alt.comp.periphs.mainboard.asus (More info?)

I am trying to figure out how to set up my a8v for aggressive memory timings
and maybe a mild overclock. I am unfamiliar with this bios, I have had Abit
in the past. What ever happened to the good old days when you could
recognize where to put 2-2-2-6, T1 settings? I have been to Rojak's but
it's just too much. Anyone know where to find a guide for the a8v v2.0?
Thanks in advance!

Fx53
Corsair 3200 Twin XL

More about : a8v bios

September 13, 2004 10:13:48 AM

Archived from groups: alt.comp.periphs.mainboard.asus (More info?)

In article <vUa1d.20104$et4.4654@newssvr29.news.prodigy.com>, "Craig"
<cpaoli@pacbell.net> wrote:

> I am trying to figure out how to set up my a8v for aggressive memory timings
> and maybe a mild overclock. I am unfamiliar with this bios, I have had Abit
> in the past. What ever happened to the good old days when you could
> recognize where to put 2-2-2-6, T1 settings? I have been to Rojak's but
> it's just too much. Anyone know where to find a guide for the a8v v2.0?
> Thanks in advance!
>
> Fx53
> Corsair 3200 Twin XL

This is the BIOS writer's guide for Athlon64. It has a section with the
timing parameters. Not all of the AMD timing parameters are a function
of the memory - some are specific to the motherboard implementation.
Those would best be left at auto. (Pg.81)
http://www.amd.com/us-en/assets/content_type/white_pape...

Here is a sample memory datasheet. There are five figures of read
and write cycles at the end of the datasheet. There is a table of
timing numbers (in nanoseconds - these have to be converted to
clocks at 5 nanoseconds apiece). Notice how some of the timing
parameters are interdependent - one timing parameter must be
greater than the sum of a couple of others. This means you cannot
arbitrarily crank down the numbers. If you do crank down the numbers,
I think the burst of data can be aborted, and the memory bandwidth
suffers. (Possibly a low Tras will do that.)

(pg.58 DDR400 3-3-3 timings, figures pg.77-81)
http://download.micron.com/pdf/datasheets/dram/ddr/256M...

I have yet to see an authoritative description of setting timing
parameters, so I hope the above two docs will give you some hints
as to how it works.

At PC3200 (DDR400), the definition of the SPD EEPROM is covered by
the standards. That means the proper timing should already be there
without having to set it. (I.e. Corsair would have put DDR400 timings
in the SPD on the memory DIMM. For PC3500, PC3700, PC4000, this is
normally not the case, and it is possible for those sticks, the SPD
is still set to numbers appropriate for PC3200/DDR400. In those cases
it is up to the user to set the timings.) Perhaps a Windows utility
like CPUZ or Sandra, can verify that you've already got 2-2-2-6 ? If
that is the case, it is pretty hard to twist the knob much tighter
than that :-)

If you are cranking the FSB, you'll have to back off on the timing
numbers a bit. A good place to start, is changing Trcd from 2 to 3,
as that is one way to encourage a higher clock. You should also set
Vdimm according to the manufacturer's voltage limits - overvolting
memory that cannot take it, is an expensive mistake.

Check a review site like Anandtech, for recommendations on Tras.
Wesley Fink usually runs tests to determine the range of numbers
which give good bandwidth numbers. A higher number can sometimes
be better, but it is a function of the chipset/BIOS, so someone
else's experimental results are a good source of info.

http://www.anandtech.com/mb/showdoc.aspx?i=2128&p=5

HTH,
Paul
Anonymous
a b V Motherboard
September 13, 2004 4:21:00 PM

Archived from groups: alt.comp.periphs.mainboard.asus (More info?)

In article <nospam-1309040611470001@192.168.1.177>, nospam@needed.com
(Paul) wrote:

> In article <vUa1d.20104$et4.4654@newssvr29.news.prodigy.com>, "Craig"
> <cpaoli@pacbell.net> wrote:
>
> > I am trying to figure out how to set up my a8v for aggressive memory
> > timings and maybe a mild overclock. I am unfamiliar with this bios,
> > I have had Abit in the past. What ever happened to the good old days
> > when you could recognize where to put 2-2-2-6, T1 settings? I have
> > been to Rojak's but it's just too much. Anyone know where to find a
> > guide for the a8v v2.0? Thanks in advance!
> >
> > Fx53
> > Corsair 3200 Twin XL
>
> This is the BIOS writer's guide for Athlon64. It has a section with the
> timing parameters. Not all of the AMD timing parameters are a function
> of the memory - some are specific to the motherboard implementation.
> Those would best be left at auto. (Pg.81)
> http://www.amd.com/us-en/assets/content_type/white_pape...
> 26094.PDF
>
> Here is a sample memory datasheet. There are five figures of read
> and write cycles at the end of the datasheet. There is a table of
> timing numbers (in nanoseconds - these have to be converted to
> clocks at 5 nanoseconds apiece). Notice how some of the timing
> parameters are interdependent - one timing parameter must be
> greater than the sum of a couple of others. This means you cannot
> arbitrarily crank down the numbers. If you do crank down the numbers,
> I think the burst of data can be aborted, and the memory bandwidth
> suffers. (Possibly a low Tras will do that.)
>
> (pg.58 DDR400 3-3-3 timings, figures pg.77-81)
> http://download.micron.com/pdf/datasheets/dram/ddr/256M...
>
> I have yet to see an authoritative description of setting timing
> parameters, so I hope the above two docs will give you some hints
> as to how it works.
>
> At PC3200 (DDR400), the definition of the SPD EEPROM is covered by
> the standards. That means the proper timing should already be there
> without having to set it. (I.e. Corsair would have put DDR400 timings
> in the SPD on the memory DIMM. For PC3500, PC3700, PC4000, this is
> normally not the case, and it is possible for those sticks, the SPD
> is still set to numbers appropriate for PC3200/DDR400. In those cases
> it is up to the user to set the timings.) Perhaps a Windows utility
> like CPUZ or Sandra, can verify that you've already got 2-2-2-6 ? If
> that is the case, it is pretty hard to twist the knob much tighter
> than that :-)
>
> If you are cranking the FSB, you'll have to back off on the timing
> numbers a bit. A good place to start, is changing Trcd from 2 to 3,
> as that is one way to encourage a higher clock. You should also set
> Vdimm according to the manufacturer's voltage limits - overvolting
> memory that cannot take it, is an expensive mistake.
>
> Check a review site like Anandtech, for recommendations on Tras.
> Wesley Fink usually runs tests to determine the range of numbers
> which give good bandwidth numbers. A higher number can sometimes
> be better, but it is a function of the chipset/BIOS, so someone
> else's experimental results are a good source of info.
>
> http://www.anandtech.com/mb/showdoc.aspx?i=2128&p=5
>
> HTH,
> Paul
>
I didn't ask the question but that information is very useful, thanks :-)

John

Please remove "NO-SPAM" if sending email.
September 14, 2004 8:48:25 AM

Archived from groups: alt.comp.periphs.mainboard.asus (More info?)

I did ask the question and i can't thank you enough! Sorry about the delay
in my response, just got back from a friends.
"John Hollingsworth" <jwh@cix.co.uk> wrote in message
news:memo.20040913122144.2344E@jwh.compulink.co.uk...
> In article <nospam-1309040611470001@192.168.1.177>, nospam@needed.com
> (Paul) wrote:
>
>> In article <vUa1d.20104$et4.4654@newssvr29.news.prodigy.com>, "Craig"
>> <cpaoli@pacbell.net> wrote:
>>
>> > I am trying to figure out how to set up my a8v for aggressive memory
>> > timings and maybe a mild overclock. I am unfamiliar with this bios,
>> > I have had Abit in the past. What ever happened to the good old days
>> > when you could recognize where to put 2-2-2-6, T1 settings? I have
>> > been to Rojak's but it's just too much. Anyone know where to find a
>> > guide for the a8v v2.0? Thanks in advance!
>> >
>> > Fx53
>> > Corsair 3200 Twin XL
>>
>> This is the BIOS writer's guide for Athlon64. It has a section with the
>> timing parameters. Not all of the AMD timing parameters are a function
>> of the memory - some are specific to the motherboard implementation.
>> Those would best be left at auto. (Pg.81)
>> http://www.amd.com/us-en/assets/content_type/white_pape...
>> 26094.PDF
>>
>> Here is a sample memory datasheet. There are five figures of read
>> and write cycles at the end of the datasheet. There is a table of
>> timing numbers (in nanoseconds - these have to be converted to
>> clocks at 5 nanoseconds apiece). Notice how some of the timing
>> parameters are interdependent - one timing parameter must be
>> greater than the sum of a couple of others. This means you cannot
>> arbitrarily crank down the numbers. If you do crank down the numbers,
>> I think the burst of data can be aborted, and the memory bandwidth
>> suffers. (Possibly a low Tras will do that.)
>>
>> (pg.58 DDR400 3-3-3 timings, figures pg.77-81)
>> http://download.micron.com/pdf/datasheets/dram/ddr/256M...
>>
>> I have yet to see an authoritative description of setting timing
>> parameters, so I hope the above two docs will give you some hints
>> as to how it works.
>>
>> At PC3200 (DDR400), the definition of the SPD EEPROM is covered by
>> the standards. That means the proper timing should already be there
>> without having to set it. (I.e. Corsair would have put DDR400 timings
>> in the SPD on the memory DIMM. For PC3500, PC3700, PC4000, this is
>> normally not the case, and it is possible for those sticks, the SPD
>> is still set to numbers appropriate for PC3200/DDR400. In those cases
>> it is up to the user to set the timings.) Perhaps a Windows utility
>> like CPUZ or Sandra, can verify that you've already got 2-2-2-6 ? If
>> that is the case, it is pretty hard to twist the knob much tighter
>> than that :-)
>>
>> If you are cranking the FSB, you'll have to back off on the timing
>> numbers a bit. A good place to start, is changing Trcd from 2 to 3,
>> as that is one way to encourage a higher clock. You should also set
>> Vdimm according to the manufacturer's voltage limits - overvolting
>> memory that cannot take it, is an expensive mistake.
>>
>> Check a review site like Anandtech, for recommendations on Tras.
>> Wesley Fink usually runs tests to determine the range of numbers
>> which give good bandwidth numbers. A higher number can sometimes
>> be better, but it is a function of the chipset/BIOS, so someone
>> else's experimental results are a good source of info.
>>
>> http://www.anandtech.com/mb/showdoc.aspx?i=2128&p=5
>>
>> HTH,
>> Paul
>>
> I didn't ask the question but that information is very useful, thanks :-)
>
> John
>
> Please remove "NO-SPAM" if sending email.
!