1333 FSB Mod, Confirmed To Be Working By Me.

[Kunaak]

Updated for Easier Pic.

This is showing the bottom of the CPU as if you had it upside down, facing you.

Original Post.

got bored tonight and was looking around at VR forums and came across a old pic Shamino posted awhile back and thought... why not give it a shot...

so I took one of my spare conroes, and got my conductive ink pen, did the mod, let it dry, took my PC apart and popped this in... and it almost worked.

it booted at 1333, then I rebooted, and it went back to 1066... and was jumping back and forth.
so I took the CPU out, and saw, I didnt have a nice clean connection between the two BSEL pads... so I traced over it again, and let it dry, blah blah blah...

10 minutes later... it works.
now, it's working just fine.

boots up everytime at 7 x 333.

no big deal really since I know this CPU can do over 590, but its still fun to have a higher default FSB for the hell of it.

I wanted to see if this works, so I could try it on my quad core CPU...
hoping theres a slim chance in hell, that if it boots at 1333, the chipset strap will be looser, and give me some extra OC room.
thats a 1-100 shot... but if I never do it, how can I say it wont work??

atleast this one worked.

what would be kinda interesting, is if you took a E4300, and did this mod to it, assuming you knew the CPU could do 3 ghz, it would boot up at 9 x 333 for 3 ghz.
that would be pretty cool for those cheap boards that been coming out at Frys and such, with the CPU.

anyways, next try is to make my Quad Core do the same thing...
not really holding my breath on it, but its worth a shot.

heres the boot up speed I got from CPUZ after the mod.

http://valid.x86-secret.com/show_oc?id=165085

total down time, about 20-30 minutes, to take it apart, do the mod, let it dry and put it back together.

last note...
before doing this kinda mod, make sure you have a bios on your board that will allow a 1333 FSB CPU to be used in that board.

[elyrly]

interesting post

[eva2000]

ah interesting to see how the quad core cpu does

[Kunaak]

heres some better proof that it works.

you can't fool the "Auto" setting.
set it to auto in bios, it should go back to default 1066...

but as you can see here... it doesn't.

[s e t h]

cool Kunaak. nice idea
most interesting to me would be to see if this has any effect on fsb walls when using 6x.
all the conroes i've had have walled somewhere below 500fsb :/ (some as low as 460 even on p5b-dlx)
so here i am buying and selling cpu's just trying to find one that will go to a decent speed on LN2 without having to buy the hellishly expensive unlocked series.

(intel i hope you read this...fix your fbs wall issue please )

[Kunaak]

I honestly dont believe CPUs have FSB walls.

2 years ago, if you claimed to be able to get a Pentium 4 to 500+ on the FSB. people would have just said you were a liar.

today, people do it all the time, in these latest 7 and 8 ghz LN2 tests with pentium 4's and the latest generation boards.

[over@locker886]

I honestly dont believe CPUs have FSB walls.

2 years ago, if you claimed to be able to get a Pentium 4 to 500+ on the FSB. people would have just said you were a liar.

today, people do it all the time, in these latest 7 and 8 ghz LN2 tests with pentium 4's and the latest generation boards.

I think believe CPUs have fsb walls..

Why?

I tested my E6600ES in Asus P5B-Deluxe..
Max FSB test, with..

6x ratio: 530Mhz with air
7X ratio: 530Mhz with air
8x ratio: 530Mhz with air

8x ratio: 566Mhz with Vapochill LS

I think need cold (delta temp) for cpu, if we break over fsb wall.

[mrlobber]

I honestly dont believe CPUs have FSB walls.

Try to tell this to all the people who have had various E6400 cpus which mysteriously stop at, for example, 480x8, 480x7, while another E6400 cpu can do 480x8 or 525x7, on 1333 strap, all the other hardware being the same.

Also, the GTL reference voltage mod existence confirms this as well as some users who have been banned for posting things about the FSB wall I wouldn't like to discuss openly here.

Other than that, nice find on the 1333fsb mod Might try it on my 6400to see what does it change

[Kunaak]

Try to tell this to all the people who have had various E6400 cpus which mysteriously stop at, for example, 480x8, 480x7, while another E6400 cpu can do 480x8 or 525x7, on 1333 strap, all the other hardware being the same.

Also, the GTL reference voltage mod existence confirms this as well as some users who have been banned for posting things about the FSB wall I wouldn't like to discuss openly here.

Other than that, nice find on the 1333fsb mod Might try it on my 6400to see what does it change

send me that CPU that has a wall...

watch me break it.

[fhpchris]

I honestly dont believe CPUs have FSB walls.

2 years ago, if you claimed to be able to get a Pentium 4 to 500+ on the FSB. people would have just said you were a liar.

today, people do it all the time, in these latest 7 and 8 ghz LN2 tests with pentium 4's and the latest generation boards.

You need to play with a Yonah

Nice thinking on the 1333 mod on quadcore! I need to go out and get a conductive ink pen now

by the way - does the 1333 nb strap kick in with 1333 fsb cpu or does it still require booting at 401+ as usual?

I also want to know, and would this change ram dividers on 680i like it would with a 975(I think?)?
Would you be able to run a 1333 cpu on the 1066 strap? What about the performance implications?

Can you run some 32m for me ?

[symphy]

Very nice... i also saw that mod some time ago but i've been afraid of using it...

Now i will try it on my X6800... thanks a lot

[s e t h]

ummm...well you would if you had 2 e6600 at 6X multiplier that stopped going faster at inexplicably low fsb on a p5b-dlx known to go much higher on the fsb.
swop one chip for the other and the fsb wall changes....and this all while hovering below 3ghz for the core....

fsb walls exist...you just have to look for them

[Kunaak]

ummm...well you would if you had 2 e6600 at 6X multiplier that stopped goin faster at inecplicably low fsb on a p5b-dlx known to go much higher on the fsb.
swop one chip for the other and the fsb wall changes....and this all while hovering below 3ghz for the core....

fsb walls exist...you just have to look for them

no they dont.

the P5B deluxe has a NBCC that gets higher the lower you set the multiplier.

say you have your E6600 and are setting 6 x 500 cause you think that will work.

Multiplier divide by set multiplier = X, take X and multiply that by the FSB, then take that number and multiply that by 4 and you get the NBCC.

9/6 = 1.5 x 500 = 750 x 4 = 3000 mhz.

a 3 ghz NBCC is extremely high and in 90% of cases will not be bootable.

a CPU with a lower default multiplier has a far better chance at hitting 500 then a CPU with a high multiplier, which is why you see E6300's do it all the time, but never a E6700.

yes, the 4 meg cache will hold them back... but even a 4 meg cache CPU can hit 500 stable... so thats not the issue.
its the north bridge core clock.

a typical NBCC will not like going higher then about 2400 mhz before freaking out.

if your doing default multiplier, 2400 is enough for a 600 FSB.
but once you lower your FSB, you start to drastically decrease your CPU's ability to hit stable FSBs that are really high cause you greatly increase the NBCC faster.

[xgman]

no they dont.

the P5B deluxe has a NBCC that gets higher the lower you set the multiplier.

say you have your E6600 and are setting 6 x 500 cause you think that will work.

Multiplier divide by set multiplier = X, take X and multiply that by the FSB, then take that number and multiply that by 4 and you get the NBCC.

9/6 = 1.5 x 500 = 750 x 4 = 3000 mhz.

a 3 ghz NBCC is extremely high and in 90% of cases will not be bootable.

a CPU with a lower default multiplier has a far better chance at hitting 500 then a CPU with a high multiplier, which is why you see E6300's do it all the time, but never a E6700.

yes, the 4 meg cache will hold them back... but even a 4 meg cache CPU can hit 500 stable... so thats not the issue.
its the north bridge core clock.

a typical NBCC will not like going higher then about 2400 mhz before freaking out.

if your doing default multiplier, 2400 is enough for a 600 FSB.
but once you lower your FSB, you start to drastically decrease your CPU's ability to hit stable FSBs that are really high cause you greatly increase the NBCC faster.

good explanation and I would concur with this based on my own observations.

[p0tempkin]

Has anybody else noticed that the pins marked in the diagram in the original post and the pins modded in Kunaak's pictures are not the same?

[MarlboroMan]

Has anybody else noticed that the pins marked in the diagram in the original post and the pins modded in Kunaak's pictures are not the same?

yeah, they are not the same...
i don't know which one is the right one...

i think this one is the right, as i can see on Kunaak's picture of modded cpu:




PS: i had to flip the image to the right side.

[megatron]

no they dont.

the P5B deluxe has a NBCC that gets higher the lower you set the multiplier.

say you have your E6600 and are setting 6 x 500 cause you think that will work.

Multiplier divide by set multiplier = X, take X and multiply that by the FSB, then take that number and multiply that by 4 and you get the NBCC.

9/6 = 1.5 x 500 = 750 x 4 = 3000 mhz.

a 3 ghz NBCC is extremely high and in 90% of cases will not be bootable.

a CPU with a lower default multiplier has a far better chance at hitting 500 then a CPU with a high multiplier, which is why you see E6300's do it all the time, but never a E6700.

yes, the 4 meg cache will hold them back... but even a 4 meg cache CPU can hit 500 stable... so thats not the issue.
its the north bridge core clock.

a typical NBCC will not like going higher then about 2400 mhz before freaking out.

if your doing default multiplier, 2400 is enough for a 600 FSB.
but once you lower your FSB, you start to drastically decrease your CPU's ability to hit stable FSBs that are really high cause you greatly increase the NBCC faster.

This explaination fits the experiences I am having

I can run 375 x 8 but I cannot boot at 375 x 7! If u do the math the NBCC is running higher, thats the only difference. With the e2160 default multi is x 9.

Now I need a pin mod for the default multiplier. They stopped that being moddable though.

[mascaras]

ummm...well you would if you had 2 e6600 at 6X multiplier that stopped going faster at inexplicably low fsb on a p5b-dlx known to go much higher on the fsb.
swop one chip for the other and the fsb wall changes....and this all while hovering below 3ghz for the core....

fsb walls exist...you just have to look for them

i totaly agree , FSB wall exists


i tested last week a E4300 on my p5b deluxe (570FSB with my e6600) and with my TG 5300 (DDR1200) ,and the CPU (E4300) wont boot past 370 FSB with any multi




i also had a E6400 with same problem , tested in 3 diferent boards and FSB wall was the same in all the boards with all multis



cheers

[s e t h]

funny that...as i was using 2 e6600's so as not to have the issue supposedly created by non default multipliers.
both e6600 have fsb walls
one at 460 and the other at 495fsb.
now the the really strange thing is that changing the miltiplier back to default and using -70' phase cooling made the fsb wall on both slightly worse....

so after extensive testing i can comfortably say the theory of the nb strap and default multi creating a NB fsb wall is not applicable in this case.
also i can say with 100% certainty that changing the multiplier does nothing to move the fsb wall.
and lastly two of the exactly the same cpu (using whatever multy is needed to rule out core speed as the wall) can and do have FSB WALLS at different frequencies.

if you have 2 of the same cpu like i did at the time you will be able to see the same behaviour i would think.
unless your board walls first or the cpu's are so identical that spotting the differece becomes difficult.

[Kunaak]

enough with your CPU, if you wanna discuss it further, start a topic please and dont hijack mine.

Quad Core 1333 FSB Mod Works.

[erwinz]

very nice..

[Millyons]

I wonder if there is any way to play with Bsel pads to force the 1066 strap all the time on a 1066 strap cpu....mostly for Asus P5Bdlx that switches strap at 401 by itself, could something like that work?

[Kunaak]

Yeah....

it does help alittle for Quad Cores.

Been Running 350 FSB tops for the last 2 days (since I moved from the P5B deluxe to this board 2 days ago) and now, I can get 366 stable.
still no 400+ very easy... it will boot, but wont make it into windows at more then 400+ yet.

but still, this is a improvement of 16 FSB.
pretty cool so far.

[s e t h]

oh well...this just reminded me of the lanparty revb days when ppl modded the cpu's default fsb and wound up getting higher clocks from it.

thanks for reminding me of that situation as now i can test this method you brought to my attention and see what effect it might have on conroe fsb walls.

will post back if this does indeed wind up helping max clocks in certain situations

[G H Z]

Good to see it working on Quad, lot's of chip's may get some remodeling on the underside now. Nice one kunaak.