BSEL signal problem with MS-6545E!

Hi,

I have a MSI 850E Max, (MS-6545E model) which is capable of 400&533fsb support officially. BUT! My problem is Overclocking a Celeron 2000 to 2666Mhz. I have another i850E based Asus P4T533-C model motherboard at home, which can manage to run it at 2666Mhz, but also at 136x20=2720Mhz stable. (Without Voltage increase, 1,525Volts as usual.) It can manage to adjust the fsb 533 by pullin' down to normal 33,3 PCI settings. But the MS-6545E can NOT!

What I mean is, MS-6545E can not balance PCI bus to 33,3 it goes up 44,4MHz at that speed including the AGP and RAMBUS memory. So the system wants to run the PC800 RD-Rams at 1066Mhz, that they can not run at that speed normally. As a result system CRASHES!

The BSEL signals must be corrected to overcome with that problem. AD5-->BSEL1 and AD6-->BSEL0 pins indicates how to run the CPU at 400, 533 and 800. Here I need to change BSEL0 pin from Low to High. Who knows to do that? Do I need to insulate the AD6 pin or do I need to tie it to GND or elsewhere? Or is it totally not possible to change the BSEL signals?

If anyone can help me, I would be grateful... C

I would try the msi forums for that one b/c I haven't done a pin mod on my processor and other than Dcasole( who lives at the msi forums ) I'm basically the only person who posts here.

Here's the link to it

http://forum.msi.com.tw/

Good Luck

-Meatball


Oh, you might try posting this in the Intel CPU area as well, the guys over there are usually familiar with pin mods.

Well, SUCCESS!

I have managed to run Celeron 2000 at 2666Mhz at post, without entering into bios by insulating BSEL0 signal on AD6 pin. YES, that's it. If the processor is 400 fsb based we can run it at 533 fsb by insulating pin AD6. The High status of the signal therefore becomes LOW when not connected on board. This indicates that it is a 533 fsb processor to the system bios.

Likewise a 533 fsb P4 or Celeron CPU can run at 800 fsb by insulating BSEL1 pin at AD5 pin. Thats a very good and easy trick.

I have used a very small screw-driver of about 0.6mm to widen the Socket 478 a bit, and put a piece of plastic cable plane protector to AD6 pin of the CPU. That was enough to cut the signal by that pin to motherboard circuits.

I am not installing the operating system to that board. Until now it goes sweet! I hope it goes like that till the end. I will run SiSoft Sandra afterwards...

I will inform about it again in detail soon or later. Bye,

Oh,
Sorry for my hurry. I have mis typed the very end of my words. It must have been go like 'I am noW installing the operating system to that board...' bla bla...

I am really in rush now.

That's a nice trick!

I thought you were trying to reduce the FSB, that's why it didn't make sense to me..... anyway, I'm glad you were able to get it to work right.

Post some benches soon.

mtb856,

I am not trying to reduce the fsb, I am trying to increase a 400fsb 2000Mhz Celeron to 533fsb speed of 2666 or up. As I have mentioned earlier, MSI can not balance to run the PCI, AGP and Ram clock of a 400fsb Ram speed at 533fsb. Normally they must be 33.3 for PCI, 133 for AGP and 800 Mhz for my rams at 533fsb. But it goes like 44.4mhz for PCI 177.33 for AGP and 1066 Mhz for Rams without the mod. The way I have done set the normal balance for the Celeron 2000 at 533fsb, which can optimally run at 2666Mhz.

I have seen that SiSoft Sandra gives 802Mhz for my Ram speed, because the board speed is 133,636Mhz. This makes me to reach 2672,72Mhz with 802Mhz Ram clock, 33,409Mhz PCI and 133,636Mhz AGP. I further incresed the fsb to 135Mhz and the Rams later worked at 410Mhz. 411Mhz is the maximum limit for my Rams and I have decided to give up for further speeds. Now the Celeron works at about 2700Mhz with 34,1666 PCI and 136,6666 AGP with 410Mhz Ram clock. Those are Normal for 135Mhz fsb.

The abnormality dissappeard with the BSEL0 modding. Without the mod, system totally can not work at 133fsb. Now it works at 135fsb fine.

Hi Friends,

I have previously said that BSEL0 mod is giving 400 to 533 fsb jump but also said that BSEL1 mod may give 533 to 800 fsb jump, which is FALSE!

Why, because I have thought that this is wrong. It may give 800 fsb but from 400 fsb not from 533 fsb. The mistake that I have done was that. Let's repeat the process crearly.

BSEL0 mod (insulation of AD6 pin) provides step up from 400 fsb to 533 fsb. [RIGHT!]
BSEL1 mod (insulation of AD5 pin) provides step up from 400 fsb to 800 fsb. [RIGHT!]

Why from 533 fsb to 800 not possible with pin modding? It is impossible because we can not make a connection inside the CPU unit. At that time we need to insulate BSEL1 pin again but we need to change the BSEL0 pin too. How can we change the BSEL0 pin? We need to change it's status from High to Low, which needs connection.

We can not do that with insulation, because the pin organizaion under the CPU is -No Connect- at this time. The method for it to -Connect- mode might be impossible unless you can make a solder under the board with BSEL0 pin with BSEL1 pin. (The BSEL0 needs an insulation too don't forget that!) But this is no guarantee, because the CPU's AD6 pin is not connected on CPU unit to anywhere and I think it won't work nearly in any way! Maybe some bioses hardly recodnize it as 533 --> 800 but really low success percentage of about %5~10 maybe.

Jump from 400 --> 800 fsb is too difficult so lets forget about this mod. What can be possible later is, if 1066fsb CPU's come with both High & High on pins AD5 and AD6, we can turn our 800 fsb CPU's to 1066fsb by insulating the BSEL0 pin again. YES, at that time a 800fsb owner may push the 800fsb CPU to 1066 fsb. Probably the 2.8GHz 775 pin 800 fsb LGA's to 3733Mhz even on Intel motherboards too.

So the final results are:

AD6 pin modding for BSEL0 gives a 400 fsb CPU to 533 fsb CPU speed. [Right!]
AD6 pin modding for BSEL0 gives a 800 fsb CPU to 1066 fsb CPU speed. [Right!] If becomes available!

*LGA 775 pin Socket owners: Please check your own pin organization from Intel's datasheets for 800 to 1066 fsb modding later because the 1066 fsb BSEL organization is yet UNKNOWN!

Ok! Follks... Thats the end of the SHOW!

See you later at a newer CPU design of todays 478 pin Socket. Upper speeds of 1066 fsb is not possible for Socket 478, because there is no possibility left for 2's combination on BSEL0 and BSEL1 pins. (LGA's have 3 BSEL signals on pins G29, H30 and G30 pins.) There is no official support for 478 users for 1066 fsb but, maybe there will be future opportunities on overclockable boards from Sis or Via for 1066 fsb speed!

Bye,

Another problem of this board is it cannot run Celeron 2600 CPU. Probably because of over 24X multiplier. If you are thinking to buy this one, think twice. Because it has no HT CPU support for 3066MHz too.