Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
"Paul" <nospam@needed.com> wrote in message
news:nospam-0505051403440001@192.168.1.178...
> In article <Pyqee.10787$jU6.4528@trndny06>, "name" <vze4j6mv@verizon.net>
> wrote:
>
>> "Paul" <nospam@needed.com> wrote in message
>> news:nospam-0505050115300001@192.168.1.178...
>> > In article <iTeee.17159$Ab.12614@trndny04>, "name"
>> > <vze4j6mv@verizon.net>
>> > wrote:
>> >
>> >> Hi, hope someone can help. I'm in the process of learning how to
>> >> overclock
>> >> my A8N-E with an AMD 64 3200. The research I've done indicates that
>> >> it's
>> >> best to use a low multiplier like 9.5 and in increments of 5 boost the
>> >> FSB.
>> >> I've read reports that with a 9.5 multiplier there were successfull
>> >> overclocks to 245-255 FSB with no increase in voltage. All this I
>> >> understand, but I have three questions.
>> >>
>> >> 1. How does the Hypertransport enter into this? Is it best to leave
>> >> it
>> >> on
>> >> Auto or should I lower it?
>> >>
>> >> 2. Should I enable or disable the AI overclocking feature? Obviously
>> >> I'll
>> >> be in manual settings mode.
>> >>
>> >> 3. I'm leaving the PCI settings at their default level, I assume this
>> >> is
>> >> ok.
>> >>
>> >>
>> >> TIA,
>> >> john
>> >
>> > I don't have this board, so if some Athlon64 board owner
>> > reads this, they can correct it.
>> >
>> > FSB is the same thing as HT. AFAIK, FSB time HT_multipler
>> > must be less than HT_Rating. Say your HT is good for 1000.
>> > Then 245 x 3 = 735 and 245 x 4 = 980. Both an HT multiplier
>> > of x3 or x4 would work, and the resulting HT frequency would
>> > be less than the 1000 I used in this example. Some people
>> > push their HT well above the limit, for whatever that is
>> > worth (more 3DMarks ?).
>> >
>> > There is also a ratio between the FSB and the memory bus.
>> > Some people swear by using a 1:1 divider, while others
>> > feel using non 1:1 dividers is acceptable too. There is
>> > some complicated relationship between the multiplier and
>> > what RAM speed will result, and at least one private
>> > forum web page had a spread sheet to show the possible
>> > values that result.
>> >
>> > If you used a 1:1 FSB:Mem divider, then the RAM would run
>> > at 245 x 2 = DDR490, which could be handled by a dual pak
>> > of DDR500 (PC4000) memory. As I understand it, some of the
>> > overclockers are happy when they hit 9 x 300, and run some
>> > TCCD memory at DDR600.
>> >
>> > Manual settings is always the way to go. Assuming you can
>> > find the right web page on one of the private forums, you
>> > can likely find a recipe for overclocking the board. Even
>> > if you find instructions for a similar board, the advice is
>> > likely to still be 95% applicable.
>> >
>> > An overclocker should have a repertoire of Windows utilities
>> > for examining what is happening while overclocking.
>> > CPUZ is good for reviewing the basic parameters of the system.
>> >
http://www.cpuid.com/CPUZ
>> >
>> > You can also look for the CG-NVNF4 version of "clockgen" here:
>> >
http://www.cpuid.org/clockgen.php
>> >
>> > Clockgen will tell you if the PCI bus is really locked at
>> > 33.33 MHz or not.
>> >
>> > Getting a copy of A64tweaker by CodeRed is another handy
>> > tool for RAM settings. Here is the download, and the
>> > development link. You would hope that CPUZ and A64tweaker
>> > agree on the settings they see.
>> >
>> >
http://www.akiba-pc.com/download.php?view.40
>> >
http://www.xtremesystems.org/forums/showthread.php?s=&threadid=37345
>> >
>> > HTH,
>> > Paul
>>
>> Thanks for the reply.
>> I'm still a little confused. The "CPU frequeny x CPU multiplier" would
>> result in the CPU speed, for example, 220 x 9.5 = 2090 CPU speed, but
>> "CPU
>> frequency x HT frequency" results in what?
>> In other words, my chip is rated at 2000MHz (AMD 64 3200) is that the
>> same
>> as the HT because if it is then a CPU frequency of 220 x HT frequency of
>> 5 =
>> 1010. The HT frequency settings on my board go from 1x - 5x or Auto.
>> Does
>> HT frequency indicate the CPU speed or the speed between RAM and the
>> onboard
>> memory controller? Pleae clarify.
>>
>> TIA,
>> john
>
> There is an architecture drawing at the bottom of this page.
> I'd have liked to use an Nvidia page for this, but I don't
> think they like to do this sort of thing:
>
> http://www.via.com.tw/en/products/chipsets/k8-series/k8t890/
>
> FSB:Mem
> Channel 0 DDR ------- Processor
> Channel 1 DDR ------- FSB x Core_Mult
>
> FSB x HT_Mult = HT_Bus
> |
> | HT Bus (bidirectional)
> |
> PCI Express Video ------- Northbridge
> |
> | Proprietary Hub Bus
> |
> Southbridge
> |
> Legacy PCI bus.
> Any other slow busses.
>
> Notes:
>
> 0) "FSB" and "HTT" terms are used interchangable. "LDT" is
> the "HT_Mult". If I owned one of these boards, I would
> be more precise in my terminology...
>
> 1) In Via architectures, they like to use separate Northbridge
> and Southbridge chips. Nvidia is using a combined chip, which
> contains both the Northbridge and the Southbridge. The combined
> chip will run a bit hotter than two separate chips would, but
> might mean a significant cost saving for Asus (chip package
> cost is a signicant portion of manufacturing cost).
>
> 2) The Hypertransport bus in this case, is the connection from
> processor to chipset. Your graphics performance depends on
> that 245x3 or 245x4 setting. Also, any I/O going to disks,
> LAN, USB, Firewire, is going through the HT bus.
>
> 3) FSB x Core_Mult gives the processor core clock.
> 4) Through some complicated logic, the FSB:Mem divider is
> set. I used to have a very nice web page that discusses the
> arithmetic, but can no longer find the link I posted in
> Google.
>
> This link explains how the memory divider is approximated.
> The core clock is divided down, to get the memory clock.
>
>
http://web.archive.org/web/20040423180605/www.dugu9tweaks.net/guides/a64oc/index2.html
>
> There is more info here:
>
http://web.archive.org/web/20041112170147/http://www.bleedinedge.com/forum/showthread.php?t=3697
>
> I had to use the slow web.archive.org server, because the
> original links are gone. I don't know why the private forums
> are aging out their old posts, when disk drives are so
> cheap, and one drive can store a lot of posts. web.archive.org
> can be a PITA to use, because hyperlinks on a rendered page
> are frequently truncated, and you have to hand craft a corrected
> link to jump to another page.
>
> search engine: altavista.com
> search terms: athlon64 spreadsheet multiplier fsb
>
> HTH,
> Paul
Thanks again, the above has been very helpful, the fog is lifting. You've
given me a good starting point to work from. I've been doing some research
and it seems it's all in the memory timings. I fiddled around with the CPU
frequencies and CPU and HTT multipliers and while the CPU speed increased
the memory bandwidth went through the floor. AIDA showed memory read
dropping from 57xxMBs to 37xxMBs. I beginning to understand with A64s
already low memory latency there some adjustments is memory timings to be
made, otherwise just boosting CPU speed can, actually make your system
slower. I found one good explaination at
www.insaneteck.com/index.php?page=overclocka64 .
Once, I figure all this out I'll post my results, bearing in mind it'll take
awhile.
john
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