Any Ideas ???

[Manny]

I am trying to overclock a celeron 566, test spec "SL4PC" cCO stepping. Have an Abit "BH6 rev 1.01a" Gorb fan. Best I can do is as follows;

fsb 75 mhz v=1.70 all ok, no problems at all..
fsb 83 mhz v=1.75 all ok, except I cannot on shutdown use the "Restart" or "Restart in MS dos mode". It goes down to the dark screen and there is where it hangs, I tried adjusting the core voltage no help. I can however use the "Shutdown mode" I have tried a couple of third party Restart utilities, still no help.
Otherwise everything else is rock stable.

I Go back to 66 fsb, or 75 fsb and all works ok..

I read where many are able to get the 566 with the "Bh6" to 850 mhz 100 fsb and beyond without any problem. I cannot use the 100 fsb, it will boot up to the windows logo screen and freeze with only 1/3 of the logo drawn. I've taken the core voltage gradually up to 2.0 volts...

I came to the conclusion that my BH6 along with a couple of friends I know will not do 100 fsb, we all tried a while back to OC a celeron 400 to 500, best we could do was 450 w/75 fsb...

Any help or ideas is appreciated ... Thanks Mackie

 

[Tim-]

What version of bios do you have? What temps are you seeing?

 

[Manny]

Tim, thanks for quick response, I have the latest bios, " BH6SS". I have a temp gauge at the base of the Gorb fan (below the fins where it sits on the core) of the 566. the highest I've seen the temp was, 32 degrees C, I didn't leave the higher core voltages on too long after I seen that I had lock up problems. Right now running at 83 fsb and core 1.75v (living with being unable to "Restart" comp) my temp is 27 degrees C. I am also using an "Abit slockett III", everything set for "auto" and J9 set for "FC-PGA" Using Soft Sw in Bios to set things up. One thing I might ask, when I flashed my bios with "SS" I flashed the original as it was, I didn't have a procedure to follow, was there anything I should have done first with the old bios first ??? On boot it shows that the bios is now the new "SS" version...

I just a while ago removed my SB AWE32 (ISA), my Adaptec 2940 (PCI), And a Vidium (Isa) pcb. Didn't help my problem.

I tried also at the same time to remove my Promise "ATA66" card and go back to the reg IDE cable and on bd controller, but couldn't boot without it. I have a Maxtor 10 gig HD 7400 rpm.

Back about 1 1/2 yrs ago when I also had similiar problems with a cekeron 400, I didn't have the Maxtor or the ATA66 just the scsi HD. So I assumed the ATA maybe wasn't causing a problem...Ok Tim I hope I answered with enough info... Ring any bells ???? Mackie

 

[LutaWicasa]

I know there's a big diff between my old Celly and yours, but some of the freeze probs and like that I was able to clear up when I oc'ed by bumping up vcore and playing around with L2 latencey. I hopefully soon will be dealing with a new proc. as I've seen many posts of people able to use the BH6 rev 1.01 with CuMines.

 

[Manny]

Hi Luta, thanks for the hints, your suggestion about playing around with the L2 latency did the trick allowing me to "Restart" my computer when I'm overclocked at 83 FSB.... Thanks. I am OC at 83 with native core voltage (1.70) can't OC with 100 FSB no matter what, took core v in steps up to max 1.90v, just can't do it. I believe I'm not dividing bus by 1/3 when at 100. How can I tell ??? is this divide by 1/3 automatic when you go to 100 ??? I don't see anywhere in bios that I can select it, unless its done with the "Sel 100/66 signal" if so, doesn't make a difference for me. Any ideas ??? manny

 

[LutaWicasa]

O.K. Let's make it easy on your system. First, cpu setup: user define, 100 fsb. Sel 100/66 set high. Agp set 2/3. L2 latency set to 10 or as high as it will go. speed thingy set disable. You might also try setting pio mode to 4 and disable dma. If this doesn't get ya going try diabling the L2. If that works ya may be screwed as it is the L2 holding ya back. You can run without it but you will take a serious speed hit without it.

 

[Manny]

Luta, again thank you for your reply. I tried your suggestions, no help. I thought maybe they wouldn't work, although i still tried because, the night before using the utility "Soft FSB" I set the FSB to 100, (Which also showed PCI @ 33.3). In the bios the core voltage was at 1.90, select= High, cpu/agp @ 2/3, L2 latency @ 1. ( tried higher values also, but didn't change my results) Of course being that I set fsb 100 from within the desktop, I remained there I was able to run Photoshop for about 30 sec then the blue screen. Being from Pa. the weather is quite cold these days. I opened the window next to the computer and cooled the cpu temp down to 20 C, (at 100, 1.90v normally reports 34 C) ran Photoshop again and this time was able to run Photoshop stable for approx 3 mins before the blue screen. I decided at that time I had a 566 that is one of those that ain't gonna hack it @ 100 unless I use serious cooling, but then again I"m not too confident it will. So I will still try any and all suggestions hoping I'm wrong. Right now I'm back to fsb 83 core v = 1.70, L2 latency = 1 and all is stable. Below a run down on my system :...... Regards manny

566 @ 83 fsb, 708 Mhz (Gorb cooling)
256 mb PC100 (7 ns, Cas 2)
Maxtor 10GB Ide HD @ 7400
Seagate 4.5 GB scsi
Adaptec 2940W scsi controller
Matrox G400 Max
Vidum video card (ISA)
SB Awe 32 Sound card (ISA)