Dave...IMHO, 51-53 is fairly warm for your CPU, especially given that your case temp is only 23.
If your heat-sync has a thermal pad, get that sucker off of there to begin with. Then apply some quality thermal grease and see if that helps to get you closer to the 40c mark or lower. My PIII 450 (though modified) runs sub 35c consistenly, even under full load. You've been here long enough that I'm not gonna get into lapping your heat-sync, or recommend taking the cover off your PCB, or getting a TennMax or Alpha fan setup.....figure you already are aware of all that.
Also, I'm not 100% sure, but I thought that the 3.3v for I/O was the setting for your RAM. I've leave it as-is.
As for the CAS/RAS, they are memory speed/timing settings. If your RAM stick is rated as CAS2, then you have it set correctly. However, moving them to 3 might provide you more system stability when over-clocking.
I do have an Alpha P3125 and it is lapped. I am not sure the goop I have is quality but I got it from Phillip at Millisec so I think it is ok. I am right on the edge of stability here so I may drop it down to 575 or so if the temp cannot be taken care of. For cooling (I'm sorry I forgot to list these) I have the:
2 80mm box fans
2 486 cpu fans
Case temp has been solid at 23 the whole time with either the case open or closed.
[This message has been edited by daveleau (edited 02-07-2000).]
Well, I'm kinda at a loss. At first, I assumed that your instability was due to heat, but if you are measuring temp from the CORE of the CPU, then 51C isn't all that bad. If you are measuring it from the thermistor placed on the heat-sync, then I think it could be lower (ie: sub 40C).
Your thermal grease is probably just fine. My concern was that you either didn't have any, or it was some substance not specifically designed for heat transfer.
Not really sure that you would have had to go to 2.2v just to achieve the speeds you have, but figure you would have tried it lower and failed, hence the bump up from standard.
Since at 590Mhz you say you are right on the edge of stability, I'm gonna guess that its an issue with your RAM or the devices you have attached to your puter. I know that my RAM, though I thought it was quality pieces, tends to begin to flake out above 117Mhz. Maybe yours, even though its Micron, is the same way. It didn't seem to matter what I tried with mine (increase volts, increase CAS latency, increase recovery times for ISA, etc.) my CPU would simply not go much higher than 117Mhz FSB with the RAM I have. Also, it does go right up to 117 at standard voltage, so you may want to back yours down and see if it has the same stability as it does at 2.2 volts. You may be able to knock a few degrees off the over-all temp by doing so and still have it be stable.
You might also want to make sure that your heat-sync is attached properly, and that if you have taped a thermistor to the bottom of your sync, that its not interferring with the contact of the CPU.
Best of luck man.
The temps I am seeing are from the temp monitor included in the P3 (?) I haven't added anything. Everything is reported by the Winbond chip. The HS is connected through the processor and the back plate via the screws Alpha sent with the HS. I have 2 RAM sticks and will try the other. It is generic but I willt ry it anyway. I will also try to set it to CAS 3 to see if that helps stability so I can drop the Voltage. It will post and be stable for a short time at higher speeds or at lower voltage but crashes after a few things are run in Win98. Thanks for the info. I will keep you posted.
Oh as for the temp monitor. I had a Celeron setup this exact way earlier to test it and I did not get a CPU temp so I assume it is something inside the P3 that is giving me that reading of 51 C. Thanks-
From experience with me PC66 64mb stick, it does not like Cas3 settings one bit. Crashes after crashes after crashes, I've even gone as far as having to do a total reinstall. Thank god for my cdrw I got everything back in place quick and easy.
Definetly try Cas3.
Also, are you using SoftFSB? Try it, it worked for me. I can overclock higher with the SoftFSB proggie than without.
Assuming that the non-Cumine P3's default core voltage is 2 volts, 2.2v may or may not be enough. I personally would try 2.3v , but 2.4v is my max limit.
Also, try reducing your L2 cache latency. That also helps.
Keep us updated, Dave.
The BF6 only supports up to 2.3V so I have maxed that out. I will try the Cas 3. BTW my RAM is PC100 but at fsb of 120+ it crashes.
Dave, should've tried overclocking the P3 with the PC133 ram I gave you first before you traded it away. Tops my PC66 stick can go is 124mhz, no more. Pretty good actually considering I almost doubled the mhz-rating.
When it crashes, do you get any kind of vxd or dll errors? How fast are you running your PCI bus at?
Yeah I know. I got a burner and a PlayStation for it and some other stuff though.
As for the errors, most are explorer crashes. I do get some VXD errors. I had to reformat once because Win redid my registry and I started over from scratch. Taht was when I decided to drop back down.
Dave, what FSB speed are you using? You know if you clock the fsb too high and your mobo doesn't have a 1/4 PCI divider, that can really stress your pci devices, especially your hard drive and cause major crashes and file corruptions.
VXD errors are not fun at all.
Check out how fast your PCI is running at.
That may be a potential problem.
Seeing that to get your P3-500 to clock to 620 or 615, you would have to set your fsb to 124 and 120, respectively. That means your PCI's running @ around 40mhz and 41mhz, respectively also.
Well I have it running stably now at 118 fsb (CL 3) with the PCI divider at 1/4. At 1/3 it is running at 38.5. Is that too high? I have a SBLive! Value as my only PCI device. I do have a USR ISA modem. How are ISA devices affected by the higher fsb? I plan to go a little higher to see if the CL at 3 helps. The temp is a little lower now (room temp hasn't changed) at 47 C instead of 52 C with RC5 running.
Hmmm, I guess I should've kept the 64 of PC133... My hdd in the machine with the P3 is a WD. Are they ok to oc? I know the Maxtors often give fits when you try to chacnge the fsb. I tried to change it in my other system (112MHz) and the sizes of the drives were reported incorrectly. And what about the ISA boards? Thanks-Dave
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