Asus P2b-ds @ 133mhz Fsb

[ayoub_ibrahim]

the jumper settings for 133fsb on a p2b version 1.10

[X-Caliber]

Thank You!!

Since my board only has three jumpers, I will need to BUILD the FS3 from scratch (stupid ASUS!)

Thanks again.

[dZeus]

Originally posted by X-Caliber
Hi Maggi,

When I first got my board, it came from someone who was running dual 800MHZ EB processors (incidentally, it never even occured to him that the PCI bus would be overclocked - he was also running an G450 PCI). So when I got it, I ran the FSB at 133MHZ (but with no PCI cards installed), and Sandra was unable to tell me what the PCI bus frequency was (it was just blank). I then downclocked to 100MHZ (does everyone know that the 800MHZ EB FSB 133MHZ chips are idential to the 600MHZ E FSB 100MHZ chips!!), still with no PCI cards installed, and Sandra was able to tell me the correct PCI bus frequency......I wish I had a 60MHZ Oscilloscope.

in fact, all CPUs of the same stepping no matter which manufacturer, are 'the same'. They only just might be binned at different speeds and/or have defects that are different.

[morse]

Re: Asus P2b-ds @ 133mhz Fsb

Originally posted by X-Caliber
Hi,

Currently I have an ASUS P2B-DS REV 1.06 D03 motherboard, and I wanted to set the FSB to 133MHZ. I was wondering, have any of you guys tried this? Any success? Did you make any hardware modifications, say, some of those listed on this website: http://tipperlinne.com/p2bmod ? What are your results?

I am mainly concerned about the PCI bus frequency, whether it changes when you overclock the FSB (from 33MHZ to 44MHZ)? Some places claim there is a built-in 1/4 PCI bus divider, but others say NO.

Thanks,

-V-

Yes you can do this. I have a friend that is running two PIII 800s in Asus slockets at 133 on this board. I myself have this board and am planning on running two PIII 1000 at 133.

I corresponded with the author of timberline.com when he answered a similar post of mine in Asus usenet group. here is his answer regarding running two PIII 1Ghz at 133 in Asus S370-DL Slockets on your board. You can get the slockets on Ebay. Make sure your CPUs use the same sSPEC number and stepping. I just talked to Intel and Asus today about this.

also check out http://homepage.hispeed.ch/rscheideg...grade_faq.html

-------------------------------------------------
tipperlinne.com answer>>

The PCI bus will be overclocked to 44.33Mhz which may be problematic for your PCI devices, and in particular the IDE controller. I recommend
backing up any IDE drives you may have first as there is a risk of
corruption.

- The AGP bus will be overclocked to 89Mhz, but many video cards will
tolerate this, in particular those with nVidia chipsets.

- You may not be able to run as much RAM as you'd like. 512MB usually
works fine at 133Mhz FSB, 768MB is often possible, especially if you use
Micron memory, but 1GB is rather elusive at 133 on these boards.

The PCI overclock issue can be resolved by adding a 4th FSB jumper to
the board to enable the 133Mhz FSB/33.3Mhz PCI setting supported by the
clock chip but not implemented by Asus.

The only solution to video issues due to the AGP overclock is to use a
card which tolerates 89Mhz.

RAM capacity at 133Mhz is usually improved by increasing Vio from the
default 3.2v to 3.4v - this requires a board modification. I have two
systems running 1GB RAM at 133Mhz with this modification, but it
required selecting amoung identically marked Micron RAM modules, and I
have to enter and exit the BIOS on every boot to have all the RAM
recognised. I don't know why this BIOS trick works, and it doesn't work
on all boards.

My P2B modification site describes the 4th FSB jumper and Vio
modifications in detail:

http://tipperlinne.com/p2bmod

[X-Caliber]

I have also corresponded with Simon. btw, this post was done quite a while ago - I have since learned much more! Currently I am running a P2B-DS board with dual 1.4GHZ Tualatins @ 133MHZ FSB and 1 gig of ram. btw, I did not need to raise the VIO voltage like Simon. There is a trick - if when you reset the computer, and you go immediatly into the bios, then exit, ALL the ram will be detected! With regards to the PCI bus frequency, I just use SoftFSB and change it everytime I boot up - (I usually leave my PC running for months at a time). Everything on my machine runs really well - and really fast (stable too!)! I am using a Parhelia, which handles the AGP overclock nicely. Also, all my drives are SCSI, which has a seperate 40MHZ FIXED bus!!! If you have any questions, feel free to ask me.

btw, I would skip the ASUS S370-DL's which cost $50 each and get the Slot-T's, which cost $20 each and do the modification from Simon's website. Incidentally, I chickened out and sent my board to Simon for a swap - but if you can solder really well and have very small fingers, then you should be able to it yourself. The Slot-Ts also run Tualatins, while the S370-DLs need a big modification.

[morse]

Originally posted by X-Caliber
I have also corresponded with Simon. btw, this post was done quite a while ago - I have since learned much more! Currently I am running a P2B-DS board with dual 1.4GHZ Tualatins @ 133MHZ FSB and 1 gig of ram. btw, I did not need to raise the VIO voltage like Simon. There is a trick - if when you reset the computer, and you go immediatly into the bios, then exit, ALL the ram will be detected! With regards to the PCI bus frequency, I just use SoftFSB and change it everytime I boot up - (I usually leave my PC running for months at a time). Everything on my machine runs really well - and really fast (stable too!)! I am using a Parhelia, which handles the AGP overclock nicely. Also, all my drives are SCSI, which has a seperate 40MHZ FIXED bus!!! If you have any questions, feel free to ask me.

btw, I would skip the ASUS S370-DL's which cost $50 each and get the Slot-T's, which cost $20 each and do the modification from Simon's website. Incidentally, I chickened out and sent my board to Simon for a swap - but if you can solder really well and have very small fingers, then you should be able to it yourself. The Slot-Ts also run Tualatins, while the S370-DLs need a big modification.

Thanks for the info. I already have the Asus slockets. I bought them a few years ago for other things...not dual. I didn't even know they were dual at the time. I paid $25 for them.

What did he charge you for the swap? How does that work.And how much are the P III 1.4 S CPUs?

[X-Caliber]

I gave him three (unmodified) Slot-Ts for two modified Slot-ts. Those cards were $20 each, and I originally bought 4 (I have two P2B-DS boards). But I made a mess of the soldering, so I contacted him and asked for the swap. Those P III 1.4 chips go for $150 each - but there are also different steppings. You can mix different steppings if you want, but you should just be careful and get matching CPUs. Mine are SL6BY. btw, these CPUs are really fast, and have a FULL 512k cache, which runs at full speed. if you want to max out your board, then you will have to spend a little more.

[morse]

Originally posted by X-Caliber
I gave him three (unmodified) Slot-Ts for two modified Slot-ts. Those cards were $20 each, and I originally bought 4 (I have two P2B-DS boards). But I made a mess of the soldering, so I contacted him and asked for the swap. Those P III 1.4 chips go for $150 each - but there are also different steppings. You can mix different steppings if you want, but you should just be careful and get matching CPUs. Mine are SL6BY. btw, these CPUs are really fast, and have a FULL 512k cache, which runs at full speed. if you want to max out your board, then you will have to spend a little more.

So he didn't charge you any money, just the $20 slocket and your board? Surely you must of had to pay shiping or something.

Where did you buy the 1.4 Server CPUs for $150 ?

[X-Caliber]

I sent him 3 slotkets and paid for return shipping, and he sent me two. But canada charges a tariff, so $$$

I got my CPUs from Newegg.com, in their refurbished section. You have to check often (they update several times a day).

[morse]

So you didn't have to modify anything but the sloctkets? Nothing on the board?

[X-Caliber]

no, no modifications on the board. But just to make things bulletproof, I am giong to change replace the green heatsink on the BX chipset with a Lasagna cooler:

http://www.tennmax.com/BGA_cooler_guide.htm

http://forums.murc.ws/showthread.php?s=&threadid=45157

[X-Caliber]

Hi Morse,

If your thinking of building a DUAL CPU based system with the P2B running @ 133MHZ, I would say don't bother!!!! I have mine running, and although everything is stable, I often wonder whether this is just a ticking time bomb. With the amount of time I spent putting this together, and the amount of research it took, I realized in the end that I should have just gotten a DUAL XEON. For example, everytime I boot up, I have to go into the bios, and then exit - this way the computer will actually recognize all of my ram. Then when I boot up, I have to run CPUFSB, and chance my PCI bus speed (44MHZ -> 33MHZ). Also, if I leave my USB HUB attached to my PC, my computer won't boot up. For some reason, when running the CPUs @ 1.4GHZ w/ 133MHZ FSB, the USB hub goes crazy. But when I was running my 800MHZ EB (also 133MHZ FSB), the USB HUB was fine. Also keep in mind that you will have to buy really good ram. I managed to get four 256M PC150 Corsair's for $50 each. In the end, I realized that at most, I can have 1 gig of ram - which is fine nowadays, but that seriously puts limits on this system. The Tualatins are a nice CPU, but Intel doesn't make a good chipset specifically for them. If you still want to try, I would recommend the ASUS P3C-D, Rambus solution. This way you won't have to overclock anything, the Slot-T's don't need to be modified, and you won't be limited by 1 gig of ram.

[morse]

Thanks. That is the decision I have come to. In fact I just took delivery of my PC Power and Cooling Xeon PS and will be building a dual 3 Ghz Xeon system.

For the P2b-D, I think I am just going to go with what I have = single 1.1 Ghz Celeron in a slotkets and watch Ebay. Maybe I can picked up a matched set of 800s at 100FSB at a reasonable price. But that is the real problem with this board, trying to find a match set (stepping) and the price of these slot one or socket 370 100Mhz FSB processors are just crazy!

[X-Caliber]

I have two 800EBs, 133MHZ, which will run fine on your system - if you are interetsed!

[morse]

Originally posted by X-Caliber
I have two 800EBs, 133MHZ, which will run fine on your system - if you are interetsed!

133FSB is the problem. If I could run that I would just buy a couple of 1 Ghz processors for 100 a piece from NewEgg. But it would overclock the AGP and PCI BUS and I know I can't run my PCI devices in a overlcocked BUS. And it probably wouldn't be too good of an idea to run a All in Wonder card at 89 Mhz.