1333 FSB Mod, Confirmed To Be Working By Me.

[lionheart]

Very nice 4300 will go to heaven ^_^

[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.

[Kunaak]

PS.

I am sick of coming in here and seeing people trying to take over the post with other topics...

if you wanna start a topic about FSB walls... do that.
I already asked one person to stop trying to hijack my thread already...

[mrlobber]

Kunaak, nobody said "FSB wall" couldn't be broken The point is, it exists on unmodded hardware and kicks in, sometimes not allowing to max out the potential mhz for the cpu it is actually capable of.

Now your 1333fsb pinmod might help here a little as well - what you showed with your Kentsfield right here - so I wouldn't call this discussion "hijacking" of your thread, and I think it would be on topic if people reported in here if this mod helped to achieve them higher fsb on various Allendale/Conroe/Kentsfield cpus.

However, if you think otherwise, I believe, you have the moderator power to make your corrections

[Fuji]

that's pretty good. Did you have to increase the voltage? A 500 Mhz overclock is a pretty big deal.

[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]

awsome discovery...
thanks Kunaak

by the way i have bumped an old fsb wall thread to continue offtopic discussions over there. post#60 page 3. http://www.xtremesystems.org/forums/...81#post1997281

well a lot has happened since this thread started (like gtl vmods and boards that can tune it) but i have a reason for dragging it up.

Kunaak has tested a pin/paint mod that defaults cpu's fsb to 333bus.
so far this has resulted in a 16mhz fsb improvment on his Q6400.

anyway what needs to be tested is if the fsb walls improve with this mod for conroe and allendale cpu's.

here's the mod. post #18 http://www.xtremesystems.org/forums/...d.php?t=132900

[Rickster_64]

Looks like more of a benefit for Quad cores. Can we get some posts from people trying this out on their own?

[Yoxxy]

Looks good, congrats on the mod.

[MarlboroMan]

awesome find Kunaak, now we need to test if 24/7 about a month or two to see if will not damage the cpu

when I buy a p5bd i will do it for sure... now my crappy board max fsb is 300

[HamidFULL]

Tanx a lot for Pics but its possible on Gigabyte rev1.0 mobos? anyone tried with Gigabyte or Asus?

[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?

[M3kk]

I tried it on my E6600ES, but it doesnt seem to work..

I will try again tomorrow..

http://mekk.homeip.net/cpgallery/dis...e.php?pos=-327
http://mekk.homeip.net/cpgallery/dis...e.php?pos=-326
http://mekk.homeip.net/cpgallery/dis...e.php?pos=-330
http://mekk.homeip.net/cpgallery/dis...e.php?pos=-329

[metro.cl]

why not oc it to 1333? and you get more mhz and more fsb :P


good find

[Chicco85]

Kunaak, i'd like to ask you a single question... the higher multiplier you can select after and before the 1333 MHz fsb mod is the same?

Thank you for sharing this informations.

[Kunaak]

multipliers remain the same with and without the mod.

why not just run 1333 OC?
cause some people have boards that just won't let you... like the cheap ECS boards people been getting with the E4300 at Frys.
this kinda mod would be good for them, as I said in my first post.

also, I wanted to test if a CPU booting at 1333 instead of 1066, would some how change how the CPU OC'd on the board... and it did in my case.
so I really dont know what to make of the mod yet, other then it works.
but why it effected my OC I can't say I know...

as for "did I need to increase the voltage".

like I said already, if your CPU cannot boot at default multiplier x 333, at stock voltage, then this mod isn't for you.

I know you can alter the default voltage, if you mod some other pads, but I really dont want to go that far.

[afireinside]

Didn't pin modding fsb to 200 help some chips with clocking back in the AXP days? I remember some sort of pin mod... Maybe this is the same. Could someone try running a stock chip 1333 strap on p5b then a modded chip?

[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.

[Kunaak]

what I am most curious about now, is to see how this mod, effects boards that are usually limited to the 1066 strap, like various 975X boards...

[Kunaak]

original pic replaced, for a clearer understanding of the mod, and how it needs to be done.

[MotF Bane]

Is there any chance doing this can screw up your processor (aside from the inevitable voiding of a warranty)? Such as it frying out, being unable to fit in socket, or what would happen if you connectd too many of the connector points together?

[Kunaak]

For anyone curious...

I undid the mod today, to test more...

and now, 366 FSB isnt possible for me anymore.
back to the old top of 350.

366 just will not remain stable anymore, without the mod...

[Aldy402]

very informative work kunnak ^5

id love to see this mod on a e4300/ecs fry's combo
i would go out and buy it, just to try it if i weren't in the east coast

somebody do it!