533>400FSB P4 wire trick

RichBa5tard · 30th March 2003, 19:07

I want to let my gigabyte 845PE motherboard think my 2.4B 533FSB is actually a 100FSB proc, so I can use the 3:4 mem divider.

Does anyone knows how?

jmke · 30th March 2003, 20:26

?? I didn't know that was possible

why do you want to do this, please share

RichBa5tard · 30th March 2003, 21:58

Quote:

Originally posted by RichBa5tard
...so I can use the 3:4 mem divider...

The 2.4B i've got here doesn't reach 160mhz FSB (400mem 4:5 divider) with the stock intel cooler. If i could trick it into a 400FSB proc, i could run it at 150FSB and 200mhz mem (3:4).

I've got a dozen PC3200 sticks, and i want to test them both on an intel and AMD platform.

jmke · 31st March 2003, 00:53

uhm you are talking about unlocking/changing the multiplier on a P4 ...

RichBa5tard · 31st March 2003, 07:39

No, i'm just talking about the default FSB of the proc. 400 instead of 533, multi stays the same.

I know it's possible. And there's a guide on xtreme...

jmke · 31st March 2003, 07:40

if multi stays the same you can just drop the FSB to 100

RichBa5tard · 31st March 2003, 08:08

No, underclocking in the bios doesn't make the 3:4 mem divider available. Only if the mobo recognizes the proc as a 100FSB one, i can select 3:4.

31st March 2003, 20:12

didn't knew that

i'll remeber that, btw where's the guide to do it

jmke · 31st March 2003, 23:16

we are looking for it

only found wire-trick that will change the voltage.. are you sure that you can the FSB ?

RichBa5tard · 1st April 2003, 14:52

Aha, found it!

thenakedreview

Quote:

If you have a INTEL P4 that maxes out before your memory on the 4:5 ratio because you have a 533fsb cpu.

Want the 3:4 ratio on 845E/PE mobos, for your memory??
Heres the fix.
Niko from Xtremesystems turned me on to this helpful hack.

Connect the pins circled in yellow, and your 533fsb CPU, will now be deteceted as a 100fsb part. In your BIOS you should no see the option for 3:4 ratio. Seems to work on most motherboards.

Thx to glenn@B2OC

30th March 2003, 19:07	#1
RichBa5tard [M] Reviewer/HWBot ***** Join Date: May 2002 Posts: 3,344	533>400FSB P4 wire trick I want to let my gigabyte 845PE motherboard think my 2.4B 533FSB is actually a 100FSB proc, so I can use the 3:4 mem divider. Does anyone knows how? __________________ HTPC (mac osx): Mac Mini \| Core Duo 1.6Ghz \| 2GB DDR2 \| 26\" TFT Development (mac osx): Macbook \| Core 2 2.0Ghz \| 4GB DDR2 \| 250GB HD Games (win xp): E2160 @ 2.4Ghz \| HD3850 OC \| Asrock 4coredual-vsta \| 2GB DDR2

30th March 2003, 20:26	#2
jmke Madshrimp Join Date: May 2002 Location: 7090/Belgium Posts: 79,010	?? I didn't know that was possible why do you want to do this, please share __________________

31st March 2003, 00:53	#4
jmke Madshrimp Join Date: May 2002 Location: 7090/Belgium Posts: 79,010	uhm you are talking about unlocking/changing the multiplier on a P4 ... __________________

31st March 2003, 07:39	#5
RichBa5tard [M] Reviewer/HWBot ***** Join Date: May 2002 Posts: 3,344	No, i'm just talking about the default FSB of the proc. 400 instead of 533, multi stays the same. I know it's possible. And there's a guide on xtreme... __________________ HTPC (mac osx): Mac Mini \| Core Duo 1.6Ghz \| 2GB DDR2 \| 26\" TFT Development (mac osx): Macbook \| Core 2 2.0Ghz \| 4GB DDR2 \| 250GB HD Games (win xp): E2160 @ 2.4Ghz \| HD3850 OC \| Asrock 4coredual-vsta \| 2GB DDR2

31st March 2003, 07:40	#6
jmke Madshrimp Join Date: May 2002 Location: 7090/Belgium Posts: 79,010	if multi stays the same you can just drop the FSB to 100 __________________

31st March 2003, 08:08	#7
RichBa5tard [M] Reviewer/HWBot ***** Join Date: May 2002 Posts: 3,344	No, underclocking in the bios doesn't make the 3:4 mem divider available. Only if the mobo recognizes the proc as a 100FSB one, i can select 3:4. __________________ HTPC (mac osx): Mac Mini \| Core Duo 1.6Ghz \| 2GB DDR2 \| 26\" TFT Development (mac osx): Macbook \| Core 2 2.0Ghz \| 4GB DDR2 \| 250GB HD Games (win xp): E2160 @ 2.4Ghz \| HD3850 OC \| Asrock 4coredual-vsta \| 2GB DDR2

31st March 2003, 20:12	#8
StaRflaM Posts: n/a	didn't knew that i'll remeber that, btw where's the guide to do it

31st March 2003, 23:16	#9
jmke Madshrimp Join Date: May 2002 Location: 7090/Belgium Posts: 79,010	we are looking for it only found wire-trick that will change the voltage.. are you sure that you can the FSB ? __________________

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