Dothan overclocking thread

[Stalker]

hey guys,
so here are my results of 1,8(pin mod, 1,6 Vcore) Dothan with the Aopen i855 board and with my ocz bh-6(no vdimm mod, so i must use stock voltage )
Watercooling@Dothan

[Charles Wirth]

Welcome to XtremeSystems, nice pi time.

[Salkcin]

Seems crazy when the CPU's barely use 50 watt when extremely overclocked, but anyone tryed making a throttle watch journal? I think there is some varying results... could it be the CPU is boiling inside and then throttles?

Can be downloaded here - to start and stop journal recording press F5. Output will come in a .txt. Don't know if you are familiar with the software
http://www.panopsys.com/throttlewatch.htm

[macci]

1.7@ 2234 (1.37V), passive cooling, temps after 20mins of farcry (increased the Vcore just to get some more heat out of it):

no throttling

[kyosen]

>>> kyosen do you still think Aopen>DFI if they are both unmodded?
--
Hmmm...Yes, though I have little interest for unmodded boards
AOpen has Pen4-semi-compatible retention frame = wide space.
DFI's space around CPU socket is too tight for larger heatsink...


>> Anyone know if the "infamous" 25s @ 2800mHz on AIR
>> x-86 secret superPi was a PATCHED result???
--
> Cant run patched on Dothan, instant error msg.
> Unless there is a dothan patch out.
--
Yes, SSE3 patch is not available for Dothan,
but SSE2 patch is effective...though it's not enough for 25s@2.8G

[Bennah]

Now thats a burn in for ya

All this Dothan fun is making me want to get one...

[charlie]

hey guys,
so here are my results of 1,8(pin mod, 1,6 Vcore) Dothan with the Aopen i855 board and with my ocz bh-6(no vdimm mod, so i must use stock voltage )
Watercooling@Dothan

Hmmmm....
Why all these variable sPi results???? I see others hitting 29s @ 25xxmHz....
All about the tuning??

C

[kyosen]

> Why all these variable sPi results???? I see others hitting 29s @ 25xxmHz....
> All about the tuning??
--
It depends on FSBRAM ratio.
Stalker's 31s@2665MHz is not slow, as 3:4 ratio.
Default Vdimm is about 2.6V, and is not enough for over 200MHz DRAM clock,
even if we use good BH-5.
...Booster or Vdimm-mod is must

[charlie]

Thanks Kyosen...
I'll have the DFI tommorrow, but no CPU....
I'll be doing the pin mod, Vagp/Vddr mods and trying some Dry Ice on it.
Unfortunately I have NO CPU....

REALLY wish I knew WHERE I could get a Dothan sometime before Monday!!!!!!!!!

C

[gkiing]

Thanks Kyosen...
I'll have the DFI tommorrow, but no CPU....
I'll be doing the pin mod, Vagp/Vddr mods and trying some Dry Ice on it.
Unfortunately I have NO CPU....

REALLY wish I knew WHERE I could get a Dothan sometime before Monday!!!!!!!!!

C

Where did you get your mobo from? I cant find anywhere that will ship to canada, and none of the online stores here have it in stock.

[n00b1337]

I'm getting mine from NCIX.
But you can also find the DFI 855GME-MGF here.


http://www.bytewizecomputers.com/products/7/7/689/7240

[gkiing]

Ncix doesnt have the AOpen mobo in stock, and the DFI is on 2 week order. bytewiz has the aopen but its 50$ more than ncix. Should I preorder the aopen off ncix and see what happens?

Which one is better? The reason im leaning towards the aopen is because I heard the ddr booster kills the dfi. Is there a vdimm mod for the dfi?

[n00b1337]

NCIX told me 4-5 days on my DFI.

[Charles Wirth]

New DFI 855 bios that supports 133FSB

http://www.dfi.com.tw/Support/Downlo...FLAG=B&SITE=US

Might have to copy and paste that link

[charlie]

But WHERE are the 133fsb CPU's??????
Does the new DFi BIOS support OC like the x-86 BIOS????
Higher Overclockability than before??
C

[RaptorRaider]

But WHERE are the 133fsb CPU's??????

Why would any overclocker want those?
Their max multiplier is lower, and since the chipset is probably the largest limiting factor it doesn't make sense buying a Dothan with a lower max multiplier. I doubt they overclock better than '100FSB Dothans'.

[macci]

Couldn't find proper dipswitches for the VID-mod so I unsoldered some pins and jumpers off a dead mobo
Figured I'd only need VID adjustements for 0-3 (1.468 - 1.708V) so I grounded 4 and 5 for starters.

Here's a piccy of somewhat finished mod (VID-mod and FB-adjustement):

(you can also see the 2G chip which I stole from the stilt )

Close up:

(click for big pic)

modded alpha PAL8942 sitting on top of the Dothan chip:


Now its time for some

[charlie]

Why would any overclocker want those?
Their max multiplier is lower, and since the chipset is probably the largest limiting factor it doesn't make sense buying a Dothan with a lower max multiplier. I doubt they overclock better than '100FSB Dothans'.

May be "better silicon"....

[charlie]

Couldn't find proper dipswitches for the VID-mod so I unsoldered some pins and jumpers off a dead mobo
Figured I'd only need VID adjustements for 0-3 (1.468 - 1.708V) so I grounded 4 and 5 for starters.

Here's a piccy of somewhat finished mod (VID-mod and FB-adjustement):

(you can also see the 2G chip which I stole from the stilt )

Close up:

(click for big pic)

modded alpha PAL8942 sitting on top of the Dothan chip:


Now its time for some

Sweet! Macci, that's some serious AIR Cooling! That HS with a silent 80mm fan would be great for 24/7 use!!
Macci, did you try the pin-wrap/wire-socket Vmod? you know, the VID>VSS mod?? Up to 1.708V avail on DFI, too

C

[Charles Wirth]

Ive done the core mod and the "booster mod" and now breaking 2.7Ghz 226hz DDR 2-2-2-5

The booster mod involves blowing out the existing voltage regulation on the mobo and depending on the booster to provide voltage to the memory.

I have tested up to 3.3v so far.

28.3K with stock video card speed.

http://service.futuremark.com/compare?2k1=8295592

[kyosen]

Nice work, macci, and "booster mod" is interesting, FUGGER!!

Here, my DFI's Vdimm&Vagp(or chipset?) mod based on x86-secret info:
<img src="http://219.113.251.125/c-board/file/855GME-MGF_Vdimm-mod.jpg">
and result:
<img src="http://219.113.251.125/c-board/file/26s_PenM765_2935.84_x19.png">

[Charles Wirth]

Thanks Kyosen, what cooling are you using?

I believe that screen answers Charlies super pi question.

Also whats the "Maro" running, I havent seen that before.

[beau_zo_brehm]

has any one tried a dothan with a phase change system?

[Charles Wirth]

Im still getting up to speed before I bolt up the phase change.

[gkiing]

Wow, interesting results. What's the world record superpi 1m? Looks like were coming close to beating it..

Fugger, what is the performance of a 2.7ghz FX51/53/55 with x800xtpe stock? How does it compare to the dothan?