1333 FSB Mod, Confirmed To Be Working By Me.

[mion]

I gave it a shot but it doesn't look like it is working

[ziddey]

mion, what board are you using? Is the bios programmed to be able to read the new bsel flags and set accordingly?

Nice find. I'm actually a little bit surprised to find that it works still. I remember when I started the pinmod trend for the dothans. But then, with the meroms (and possibly yonahs), and whatever intel was using for power consumption control (c1e maybe?).

With the meroms, forcing a 533fsb to 667 resulted in proper fsb manipulation but stuck the cpu into the lowest multiplier iirc. So it's definitely good to see that it's working well with the kenties again.

Any chance you could post some mem benches like with mbench for it at 333fsb via bsel manipulation vs bios fsb overclocking? It sounds sure enough from what you've witnessed with the extra 16fsb that it's kicking into the next strap right away.

Then again, from looking at it at another angle, wouldn't 350fsb and the lower strap result in better performance than what 16fsb could give you, at the sacrifice of a higher strap?

Also, you mentioned the ecs boards. It's a shame I don't have any fry's around me or else I would have picked up one of them by now for sure. But I take it they support 1333 with a new bios?

[blind_ripper]

looks nice , gone try it l8 out on my X6800 .
i think cpu's dont have fsb wall to , try'd 5 baords .
2 p5b green , 2 P5W DH and a Abit AB9 pro .
last P5b maxxed out @ 545fsb stock , the first one 490fsb stock .
last P5W DH maxx out @ 420fsb with 1.9vmch , first one 410fsb with 1.45vmch :p .
the abit maxxed out @ 450fsb with 1.7vmch , this whas all done with same cpu and cooling air !

[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

[Viss]

looks nice , gone try it l8 out on my X6800 .
i think cpu's dont have fsb wall to , try'd 5 baords .
2 p5b green , 2 P5W DH and a Abit AB9 pro .
last P5b maxxed out @ 545fsb stock , the first one 490fsb stock .
last P5W DH maxx out @ 420fsb with 1.9vmch , first one 410fsb with 1.45vmch :p .
the abit maxxed out @ 450fsb with 1.7vmch , this whas all done with same cpu and cooling air !

545 sounds like cpu wall with that 2nd P5B on air, a decent one though

[over@locker886]

I did mod, now go home test, and will tomorrow write result.

Sorry, photo made with low resulation webcam.

[blind_ripper]

545 sounds like cpu wall with that 2nd P5B on air, a decent one though

killed the bord but wittekakker will try to replace the dameged parts .
now its vmodded and ill tell u
http://i3.photobucket.com/albums/y90...r/530fsb8m.jpg
btw how comes do u think that fsb gose up when u increas vmch :p

Edit : tomorrow il have a Evga 680i to test with so il report max fsb to , also if the 1333fsb mod works with modded bios

[Kunaak]

I dont believe CPU's have FSB walls...

boards can, but not CPU's.

[dpa]

sounds like a good mod.. need to test it on my E6300.

[blind_ripper]

I dont believe CPU's have FSB walls...

boards can, but not CPU's.

idd kunaak i think the same .

[DerekT]

Good work Kunaak. This mod is very useful for those who have systems that do not allow for tweaking.

Edit:

I dont believe CPU's have FSB walls

Indeed.

All CPU's have a maximal limit. If one wishes to call this a FSB wall, they may do so, however they are muddying up the waters of clarity in doing so, much the same as one who calls the speed of light a velocity wall of the spaceship. The spaceship will have it's own limit and the actual speed of light is a constant (for our intents and purposes at this time at any rate). The CPU has it's own limit and the actual restrain otherwise is left to the constancy mainboard ==> chipset limitations.

[I)ickie]

Great find mate.
Reminds me a lot of the ol L12 mod. 16fsb is certainly nothing to be sneezed at.

[Kunaak]

Asus 1333 FSB Bios and Board list.

[LittleDevil]

Really interesting modification

Best Regards

[Pete]

Kunaak nice topic and mod as well as pic and documentaion and testing. Trumps to ya dude. So just to check FROM YOU ONLY PLEASE

OC puts a strap on the NB, this mod automaticly forces the FSB to the max built in OC'd FSB option of 1333 Mhz and no presure on the NB. All OC'ing after mod is extra FSB onto of the 1333 Mhz FSB already and starting to clock the NB but not as much as if we went straight in the BIOS and did it?

Or am i being totaly thick?

When my X6800 come back off warranty i think i'll be getting this mod done.

So i guess in lamens terms it

Boosts your FSB to 1333 MHZ with NO OVERCLOCKING in the BIOS or stress on the NB aka fooling it

Locks out the option to set betwen 1066 and 1333 Mhz

Back off the NB strap when over clocking.

sorry if i am being silly here and repeating but my list of mods for cpu and mobo is getting big!

[MotF Bane]

I'm running a GA-965G-DS3 with the integrated graphics, which pretty much shuts off overclocking. Would this mod get around that issue?

[ziddey]

the g965 chipset has issues in and of itself that prevent it from going into the 300's as it is. there may be a newer revision out soon to support 1333, but it's unknown. I noticed gigabyte released a 3.3 board for the 965g-ds3 but it doesn't show support for 1333 like the 965p-ds3.

[ziddey]

Figure I'd update with my findings. I've got a ds3 rev2 at the moment with a e6400 es (b1 stepping). I did the bsel manipulation while having f10 bios, which allegedly supports 1333fsb (albeit on rev3.3 boards only..). It gave me the usual stink I've been getting from this pos board lately and I had to remove a stick of ram for it to post. It posted at 2.13. Still 266fsb. Grr. Then, I flashed back to my personal fav, f7, which doesn't support 1333, and it absolutely freaked out. In the past, when using a bsel higher than what's supported (like 533 in 400 855 chipsets for dothan etc), it'd just run at the lower bsel flag equivalent. But on the ds3, it'd turn on for a split second (way shorter than standard up-down that the stupid ds3 does), then off, then on for a split second, etc. Once I removed the mod, I again had to pull a stick of ram for it to boot. But now with normal bsel flags for 266fsb, it's posting and booting again on f7.

[mion]

E6400 with mod + p5b dlx rev 1.03g 1004bios= Not working

[I)ickie]

Damn just bought a p5n-e sli.
Doesn't seem to be on that list. Hopefully a bios update will fix that.
Anyone have Core 2 instead of quad results?

[NapalmV5]

I dont believe CPU's have FSB walls...

boards can, but not CPU's.

chipset/mobo have always been the culprit, wonder if it'll ever change..

so, Kunaak/anyone on 975x + kent tried yet?

1600fsb should be just as doable, but the mobos/bios though...

[over@locker886]

I did mod, now go home test, and will tomorrow write result.

The mod works well..when computer power on, bios wrote New Cpu installed, after bios entered, I saw default clock is 9*333

But this mod isn't help cpu overclockable and more fsb

[ziddey]

Damn just bought a p5n-e sli.
Doesn't seem to be on that list. Hopefully a bios update will fix that.
Anyone have Core 2 instead of quad results?

I can't imagine core2 being different than core2 quad. The architecture is the same and bsel is bsel. No if's and's or but's. I guess the only problem is a motherboard that can interpret it and be able to do something with it.

For instance, in my case with the e6400 and ds3 rev2 board: with f10 bios and mod, it posts but at 266fsb. With f7, for some reason, the motherboard absolutely flips out. I would have expected it to boot but at 266 but alas, no. F8 and beyond (possibly F9 I can't remember) support 1333, but allegedly only with rev3.3 boards. If it works with kenty's, I have no doubt that it'd work with c2d's too with the right board.

[cryptocat]

Would be so very interesting to see whether theres also a FSB 1066-Mod for the Prescott2M!

See the thing is, i have a 630 pretested @ 4.4GHz, but my Asus P5AD2-E (925XE, capable of 1066MHz FSB!) often does crash when i OC it to 266MHz...

How could you figure out which pins you'd have to mark to get a 1066FSB?

Because theres gotta be an Option for that, hence the 3.73XE with 266QDR.

EDIT:

I Found the specs in the Prescott 3.73XE Datasheet. Will give it a try

[MarlboroMan]

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.