Untitled Document
The KM133 chipset (VT8365) is basically the KT133 chipset with
onboard Savage 4 (or ProSavage as they now call it). But on the via
site, it mentions "Flexible 66/100/133MHz FSB settings" - yet
we all know the KT133 only supports 100mhz officially and only up to around
112 unoffically. Seeing as there was no multiplier adjustment on this board,
overclocking FSB was my only option - which luckily this board supports! I was expecting this to overclock about the same as a KT133 chipset
like my old Abit KT7 and Aopen
AK73 Pro. But on the otherhand, the VIA site said it supported 133mhz FSB
(but no mention of support for 133mhz chips).
The board supports a maximum of 166mhz FSB in 1mhz increments,
but I wasn't expecting to go that high at all. But It was quite happy to run
at 133mhz on my Duron 700. This gives an overclock of 933mhz. For chips with
low multipliers, an extra 33mhz FSB is not enough to max out your chip, but
chips with higher multipliers seem a little closer.
|
Multiplier
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100mhz
|
133mhz
|
|
6x
|
600mhz
|
800mhz
|
|
6.5x
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650mhz
|
866mhz
|
|
7x
|
700mhz
|
933mhz
|
|
7.5x
|
750mhz
|
1000mhz
|
|
8x
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800mhz
|
1066mhz
|
|
8.5x
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850mhz
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1133mhz
|
|
9x
|
900mhz
|
1200mhz
|
As you can see, with the higher multipler chips - overclocking
in this board is quite acceptable. (just before I fried it, my Duron 800 was
running at 129mhz happy). As far as Tbird overclocking - this board only has
a 2 phase power solution, so I'm not sure how happy it would be with the faster
chips (as they might not get enough current).
There was no voltage modification on this board, but the great
thing about AMD chips, is the ability to just connect together the L7 bridges
with a pencil and get us 1.85volts (read 1.92v in the bios). Of course, with
some of these newer Tbirds coming in that need a lower voltage to overclock
(as discussed a lot in the overclockers.com
forum) - this may be a problem which will involve some cutting with a scalpal.
Now, 133mhz from something based on the KT133 chipset seems a
little high, yes? Sisoft Sandra reported it to have the KT133 chipset, and also
said my PCI was running at 45mhz. WCPUID reported it to have the KT133A chipset.
Either way, the KM133 chipset seems to be a relatively good overclocker. I couldn't
get it stable at anything higher than 135mhz and posted no higher than 140mhz.
I think the reasoning for not being able to go any higher is PCI
speed. Sisoft said I had a PCI speed of 45mhz. So when running my memory at
3x PCI, I should get 133mhz? Which I did. Which shows the main problem with
this chipset - NO 1/4 PCI DIVIDER. Of course, wether that is a limitation of
the board, or the chipset - I don't know. What I do know, is that there will
also be a KM133A chipset, which will of course have the 1/4 PCI.
Here are some benchmarks of the Duron 700 running under Windows
2000 with 256mb of ram and an ATI Radeon 32mb DDR.
|
|
Sisoft CPU (ALU/FPU)
|
Sisoft Memory (ALU/FPU)
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Quake 3 Fastest
|
|
7x100, mem: PCIx4
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1962/958
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387/410
|
83fps
|
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7x133, mem: PCIx3
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2610/1276
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402/411
|
98.8fps
|
Not a bad little overclock...
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