1333 FSB Mod, Confirmed To Be Working By Me.

[alpha0ne]

has it improved your overclock or given you a higher FSB to play with?

I have not tried yet as I just flashed the beta 1.4 bios to try and get past 350FSB cold bootable but will let you know later today


These bios problems with mid range Abit boards is a 'kin disgrace

[Ace-a-Rue]

i tried it on my Q6600 and it did not work...intel must have a different pin on the q6600 to bounce it up to the 1333 strap.

what the mod did do was really limit me from changing out of the default multi....as soon as i tried lowering the multi, it would not post...i checked for continuity between the two pads in addition to verifying the silver was not making any contact with the middle and surrounding pads....

bummer!

[alpha0ne]

It made FA difference to my overclock because the bios is so rooted I cant get it much above 400FSB that is bootable and stable


My last Abit board

[o2bme]

I am trying but not getting it to work on my x3220 anyone have success with this one?

[MexxT]

Is it possible to mod a Pentium 4 540 to the Xtreme Edition FSB (1066)?

that would be great!

[ziddey]

do it

[MarlboroMan]

did anyone try to do the mod on a Q/X/E6XXX (1066->1333) on a P-35 board??

[xTr33m sammich!]

FSB Wall exists afaik on my e6400, I do not have more than the one chip, however, 6x 7x 8x, they all bsod at 463FSB, 460 is fine, tested on DFI Lanparty 680i LT, DFI P965-S, ABIT IP35-PRO, and GIGA P35-DQ6 at various voltages and settings, using different rams ranging from ballistix 800 and 1000 to corsair 1066 dominators and 1066 gskills... on all systems with several different rams the results with this chip are identical, 460 max FSB... the only difference is in the performance of the boards..

[Ace-a-Rue]

did anyone try to do the mod on a Q/X/E6XXX (1066->1333) on a P-35 board??

yeah, i tried it on my Abit IP35 Pro and it did not work for the Q6600...i could post and boot but my overclock was now limited...i could not get close to 500 fsb as i was doing before.

[Antinomy]

i could not get close to 500 fsb as i was doing before.

Looks like a BIOS problem.

Is it possible to mod a Pentium 4 540 to the Xtreme Edition FSB (1066)?
that would be great!

Yes, this mod can be done on any Intel desktop processor, and does not depend on certain model. But sometimes may not work due MoBo BIOS matters, like Asus.

[Ace-a-Rue]

Looks like a BIOS problem.

But sometimes may not work due MoBo BIOS matters, like Asus.

could be but according to Kunaak, he said to make sure your bios supports 1333 processors and my Abit IP35 Pro was designed from the ground up to do that...i would think abit and asus would have the bios there in place when they sold them to do that very thing.

if i was to a wager on this, i would bet that intel caught on and changed the internal cpu registers of the newer revision cpu's to prevent us from upgrading the cpu to a 1333 bus.

[Antinomy]

It's no a requirement, just a recommendation. Or it just wouldn't work at all
As for your idea - it's not so. The problem is not in the CPU. In my article I wrote about the BSEL mechanism. On the CPU side the only thing is to pullup to Vcc or down to Vss three (in case of LGA771\775) grids. They don't even have to contact to the grid. Only connected in the proper way in the socket. No connection. So Intel can't make any influence due to the mechanism of Bus Selecting.

[MexxT]

Yes, this mod can be done on any Intel desktop processor, and does not depend on certain model. But sometimes may not work due MoBo BIOS matters, like Asus.

The pinout on a P4 is different from a C2D isn't it ?

Wich pins do i need to connect?

EDIT// oke, i found out that jou need to connect BSEL1 and BSEL2 for 266Mhz FSB, is that correct ?

[Ace-a-Rue]

It's no a requirement, just a recommendation. Or it just wouldn't work at all
As for your idea - it's not so. The problem is not in the CPU. In my article I wrote about the BSEL mechanism. On the CPU side the only thing is to pullup to Vcc or down to Vss three (in case of LGA771\775) grids. They don't even have to contact to the grid. Only connected in the proper way in the socket. No connection. So Intel can't make any influence due to the mechanism of Bus Selecting.

ok, i am following you with the pull-up or pull-down by making the connection...but couldn't intel deactivate those two pins/pads where there is absolutely no way to pull anything down or up???

[clon22]

give us some pics pls..
just curious how's it done?
thx...

Sorry forgetten abt this thread.
I posted in another thread.
2nd page, taken from my hp.
Blur but good enough to make it out.
http://forums.vr-zone.com/showthread.php?t=164050

[Antinomy]

The pinout on a P4 is different from a C2D isn't it ?

EDIT// oke, i found out that jou need to connect BSEL1 and BSEL2 for 266Mhz FSB, is that correct ?

No, it isn't different. I repeat - the Bus Selecting mechanism is a part of the MoBo. All the CPU does is connect the pins. And because the sockets for P4 and C2D are compatible (aren't they?) the pins must be the same. Otherwhise the bus would work properly only on one of the two.
Yes, all you have to do is connect BSEL1 and BSEL2.

but couldn't intel deactivate those two pins/pads where there is absolutely no way to pull anything down or up???

They could do this on their MoBo's. But though the mechanism is made only by the MoBo, it can't by deactivated anyway from the CPU side.
So you can completely isolate the CPU grids from the socket pins and set them manually. After this will you believe?

[Ace-a-Rue]

ok...abit sticks it in my ear, AGAIN! (only kidding...very satisfied with the IP35 Pro)

[nickless]

Can somebody send a pic which pins I have to connect on my E6400 and will this mod work with Asus P5K Deluxe P35?
I ask You because I've readed all posts but it's no clearly is this mod working on E6400?!

[bassie]

So if I understand correctly:

If you want to go from High to Low, connect it to a Vss or connect it to a Low BSEL.

If you want to go from Low to High, connect it to a Vcc or isolate it.

Is that correct? And would isolating work if you want to go from low to high?

So a 266fsb cpu is L-L-L, if you want to go to 333fsb you could isolate BSEL2 to make it H-L-L, or connect BSEL2 to a Vcc. Would that work?

[Ace-a-Rue]

OK!...here's my question to all the experts on this!

why can't i take my Q6600, which is a 266 FSB processor, and JUST isolate BSEL2 pad on the cpu so it does not make contact with the foot pad contact within the cpu socket to make it go from low to high...won't that do the same thing as taking it from BSEL2 to VCC?

right now, for 266 FSB base processor...BSEL1, BSEL2 and BSEL0 are all suppose to be low resistance ( i presume grounded)...SO...if all i have to do to convert to 333 FSB processor is take BSEL2 to high...if it is grounded now, i am presuming that; isolating BSEL2 pad from the corresponding cpu socket leg should take it to high...CORRECT or NOT!?

lets take a closer look what are we doing:

I've read the Intel's Core 2 Duo/Quad processor documentation to figure out what are those pins.

On page 49 of Core 2 Duo processor, we can see that we are making a simple jumper between G30 (BSEL2) <-> J30 (VCC)





On page 60, G30 means:
BSEL2 - POWER/OTHER -> Output


And on page 61, J30 means:
VCC - POWER/OTHER -> ?



So, on page 75, I've found that VCC is an Input:



And on page 69, we can se an explanation what is BSEL[2:0]


and it points to Table 17 (page 30) which is:

I can't see a possible combination to 333MHz, just 266MHz (Q/X/E6XXX) or 200MHz (E4XXX). Maybe just newer processors have it (?)


So, this mod is simply make a jumper between BSEL2, an output FSB frequency selector, and VCC which is a simple power pin.

reading Intel's Xeon 5100 Series Datasheet I've found that on page 19:

Basically, bsel is a set of flags defined on the cpu that the motherboard reads to know what fsb to set as default. Input is measured in terms of high or low resistance. Thus, in the traditional sense, to achieve a high resistance from something that's originally low, you can use white out or nail polish or tape to cover up a land. In the pga days, it's be nail polish to insulate or just yanking a pin.

To make a high resistance into one of low resistance, one can either link it to a bsel of low resistance, or link it to a ground (vss).

It looks like from this technique as posted by op, it's been determined that you can link up a bsel that's originally flagged as low to a vcc (power) to bring it to high. I'm still thinking of the phenomena behind this myself, but it looks like it'd essentially be causing a relative resistance as seen by the motherboard to be high and thus be the same as isolation of the land/pin.

[MarlboroMan]

its not gonna work. but you can try it, it won't kill your chip thou.

tip:
if you don't want to mod your cpu, you can mod your mobo!

[Ace-a-Rue]

i tried the BSEL2 to VCC but the mod did not take...checked the continuity and it was good....could be the bios not supporting the 1333 bus but i cannot see why since the IP35 Pro specs says it will support 1333 FSB processors.

maybe the boot block had it missing from the original shipping bios...since trying the mod and failing, i flashed to a beta bios, including the boot block area, the flash to the boot block gave me improved performance...only way to find out now is to rip the board out of the case...UGH!

[Ace-a-Rue]

its not gonna work. but you can try it, it won't kill your chip thou.

tip:
if you don't want to mod your cpu, you can mod your mobo!

what does the motherboard mod entail?

[pH(x)]

I just did it with a #2 Carpenter's Pencil on my lapped Core2Duo E6600

FSB is still 1066. BIOS v1801

[JMKS]

Hello!

I've done the 333 mod with a graphite paint on my E6400 (wall @ ~510, under DI ~520 so I hoped it will help even a little) and nothing happened - Commando was recognising 266 all the time {1001 & 803 BIOSes used, unfortunately shortly before BIOS 1302 was shown I removed the mod}.

Here is the picture:


I want to try again, with Celly 420 this time , so I suppose I can do the 200 => 266 mod then maybe the 266 => 333 mod - I will try.
My question is what do You think about that graphite paint - maybe I must use something different?
From what I've read about that graphite it shall do well but the result was far from my expectations...

Edit: Now the picture is working