Overclocking Sempron 2400 with KT600 chipset

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Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

Wes Newell Wrote:
> On Mon, 25 Apr 2005 20:09:47 +0100, Stephen Bowden wrote:
> --
> I found prime95 and ran it all night with CPUCool monitoring temps.
> Temps remained stable and the torture test was continuing this
> morning.
>
> Temp 1- 42C
> Temp 2- 32C
> Temp 3- 47C
> No change in vcore. So still looking goood at 183MHz.-
> System becomes unstable at 186MHz (Vcore unchanged at 1.63). Am at
> present running prime95 again at 185MHz. Temp3 now at 48C.-
>
> The KT600 doesn't support a pci lock so trying to set the FSB speed
> too
> far outside the 33MHz boundries will cause problems even if the cpu is
> more than capable of running that speed. At 186MHz FSB, your PCI clock
> is
> over 37MHz which puts the AGP bus close to 75MHz. Normal speds are
> 33/66MHz. Since 15x185 is almost 2800MHz I'll assume you've lowered
> the
> multiplier. Not sure what you're trying to accomplish but I'd either
> raise
> the FSB to 200 and lower multiplier, or go back to 166MHz and adjust
> multiplier accordingly, depending on what ram you have and how you
> have
> it set. You're probably going to top out somewhere around 2400MHz even
> by
> raising vcore.
>
> --
> Abit KT7-Raid (KT133) Tbred B core CPU @2400MHz (24x100FSB)
> My server http://wesnewell.no-ip.com/cpu.php
> Verizon server http://mysite.verizon.net/res0exft/cpu.htm
The Sempron's multiplier is locked at X10. But you're right about the
PCI clock and AGP bus. At 185MHz cpu clock (1.85GHz) the system crashed

running prime95 torture test when I attempted to play realplayer at the
same time.
How do you overcome the PCI/AGP problem? I know there are people
running
semprons at 2GHz(200MHz clock) on KT600 boards using an increased
Vcore.

At 183MHz the system seems OK although I was having lock-ups using a
PCI sound board. Am at present using on-board sound. I have still not
increased the Vcore.

Thanks for the comments.


--
Stephen Bowden

 

[Guest]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

On Tue, 26 Apr 2005 06:51:10 +0100, Stephen Bowden wrote:

> The Sempron's multiplier is locked at X10. But you're right about the
> PCI clock and AGP bus. At 185MHz cpu clock (1.85GHz) the system crashed
> running prime95 torture test when I attempted to play realplayer at the
> same time.
> How do you overcome the PCI/AGP problem? I know there are people
> running semprons at 2GHz(200MHz clock) on KT600 boards using an
> increased Vcore.
>
Setting the FSB to 200 MHz will set the pci clock divider to 6 so the pci
clock will be 33MHz. Or your board may have to be set for it in the bios.
Options are usually 4:2:1, 5:2:1, and 6:2:1 for manual settings, but it
may show it some other way.

> At 183MHz the system seems OK although I was having lock-ups using a PCI
> sound board. Am at present using on-board sound. I have still not
> increased the Vcore.
>
My original reply had me mistakenly thinking you had a 2400+ XP (15x
multiplier) instead of the Sempron with 10x, so their shouldn't be a
problem raising FSB to 200MHz assuming your ram settings are correct. You
will probably need at least 1.60v vcore and I'd go ahead and set it to
1.65v (default for 2000MHz XP's). If you have PC3200 ram you should be
able to use a 1:1 ratio. If you have slower ram, you may have to adjust
ram settings to keep the ram bus speed and CL to match your ram.
Once you get it running properly at 200MHZ FSB, you might want to try for
more. You should be able to get at least 215MHz before the pci clock
starts causing problems, but you'll probably also have to adjust vcore and
ram settings again.

--
Abit KT7-Raid (KT133) Tbred B core CPU @2400MHz (24x100FSB)
My server http://wesnewell.no-ip.com/cpu.php
Verizon server http://mysite.verizon.net/res0exft/cpu.htm