I'm a little confused.....Help to reach 144MHz FSB

[Mictlan]

Well, let me explain all that had happend on my journey to 150MHz FSB.

All was good from 100MHz to 133MHz. I upped the FSB along all the increments that my mobo allowed (100,103,105,110,112,115,120,124,133) and my hardware responded alright, well almost all my hardware. a 64 MB generic RAM chip decided not to work at 112, but I took it off and all was well.

I decided to check all my PCI devices (a Creative dxr DVD decoder card, SoundBlaster AWE 64 soon to be replace by a Hercules Game Theater) work OK at off spec bus clock and they all pass the test.

I checked my video card will survive with AGP 2X at off spec, and it worked with 1:1 at 100MHz AGP bus speed.

Having sone all this, and having burned my CPU 2 weeks with SETI, I decided that all was ready to up the FSB to 140 MHz (next available FSB that my PLL accepted).

At first it boot. But then all was frozen when I began to stress te system with SETI and 3Dmark 2000. I reboot and a BSOD greet me. I said that a Windows protection was enable and the system has been halted. I tried to reboot two more times and all failed.

I upped the Vcore by 10%, from 1.6 to 1.76 V. As I oppened my case, my system had time to cool off and it boot. But again it crashed.

With the Vcore at 1.76, I changed my FSB to 133 and boot. All OK. With SoftFSB I changed my FSB to 140 and immediatly my system crashed.

After I have done all this, I'm a little confused. Did I reach the limit of this chip? Or I'm doing something wrong? My temperatures hadn't gone up to much, I'm working at 45°C at full load. Any help will be appreciated.

 

[Placid]

Try 1.9 vcore.
Make sure you run the memory at slowest settings and agp at x2.
Your temps are a little high but if its going to have any chance at working at that fsb it should work for a few mins with the above.
If not then probably the cpu or memory.
I am not familar with siemens memory fsb capabilities.
Maybe ask in the memory section.

 

[outhouse]

I'm just about certain that its your memory see if you can set it minus clock speed and see if you can change your MS speed down a little too the only time i get BSOD is when i push memory to far on a seperate note do you have sideband disabled? I think it would be nice to see your temps somewhere in the 30C range

I know how far my memory goes after benchmarking in sisandra so once you know how high you can go you can try and set things acordingly

 

[batboy]

Please don't raise the voltage any higher unless you have a good CPU cooler and have done some cooling mods. You also need to tell us more about your system. If you've done that good with only 1.75v, then sounds like you have a good CPU, but temps seem a little high. My old Celeron 566 would began getting unstable at about 44 to 45 degrees CPU load temp. The higher the bus speed, the more case cooling you need. You might need to cool the northbridge chip down too.

 

[Mictlan]

Intel has a Vcore or 1.6 V for a PIII550E. When I was running at 100 MHz FSB I watched with MBM that I was only needing 1.5V. I left it a 1.6V from 100MHz FSB to 133MHz FSB and everything worked OK. Later in this 2 week burning, I decrease Vcore to 1.55V and everything is OK. Imight try to drecrease it to 1.5V sometime this week. The system is very stable, thats why I think that my core is a good one.

The marks of my chip are Q,949A082-0057 SL3R3 of the Malay factory. I think that my chip of the cA2 stepping, as I was reading that the other mark of the CPU changed from RB80526PY550256 to other codding system at cB0 stepping.

As for the AGP, yes, I have sidebanding dissable (never enable by the way, this Hercules drivers are kind of strange) and running at 2X. I don't think thats the problem.

I'm waiting for some gadgets. A borb for my video card, and a heatsink for my PLL. When I install the borb, the retail HSF of the video card will be installed on the northbridge. But right now, I'm patiently waiting for the Mexican mail to slowly deliver my order (ARGGGHHHH).

After all this, seems that the memory is the culprit. Could it be that Siemens memory is not that good? Well, do you think that if I raise VIO I could reach a higher FSB?

 

[outhouse]

Raising VIO can help but your going to have to try to find out just dont go to high or you can fry something quick good luck