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Asus p2B-F not able to support a 850Mhz p3?

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First post, by k9cj5

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I'm trying to get my highest slot 1 CPU to run on my Asus p2B-F and its a SL47M, stats below

p3
850/256/100/1.65 Volts S1
SL47M

Since this is a 100 Mhz FSB CPU, I have the CPU External BUS Frequency set to 100 Mhz, and the highest multiplier I see is 8x. So is the highest CPU this motherboard can support with 100 Mhz FSB a 800 Mhz P3?

The ICS Chip near the ram is
9250BF-00 9916
CK920295

I didn't realize how much more efficient the newer P3 CPUs got. I don't even know if this can drive a P3 with 1.65 volts. Any of you guys have some experience with the p2b-f?

One thing I noticed while reading the manual is how many options I have to set the FSB to. Would setting the CPU External BUS Frequency to to following be an option?

103 Mhz CPU x 8 = 824
34 Mhz PCI

105 Mhz CPU x 8 = 840
35 Mhz PCI

I really don't want to mess with the PCI clock to anything over default. For modern systems its bad practice to run the PCI clock over its spec, and I would think this to be true back in the late 90's as well. This is old hardware so I'm really not looking to push anything. It took me very long time to get my hands on this board and I don't want to blow it up by over clocking. Again thank you for your time.

Reply 1 of 3, by Gmlb256

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The PIII-850 CPU should work fine on that motherboard as long as it is a revision that supports Coppermine, the multiplier jumper settings does nothing as the CPU has it locked to 8.5x.

VIA C3 Nehemiah 1.2A @ 1.46 GHz | ASUS P2-99 | 256 MB PC133 SDRAM | GeForce3 Ti 200 64 MB | Voodoo2 12 MB | SBLive! | AWE64 | SBPro2 | GUS

Reply 2 of 3, by rasz_pl

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You forgot to describe the problem - does it not boot? That would mean older VRM design and you either need:

1 socket 370 P3 + slotket adapter with Voltage selection jumpers to force CPU into running at 1.8V
2 mod your Slot1 P3 with tape and soldered bridges to force it into 1.8V
3 replace 8.1 VRM https://cdn.preterhuman.net/texts/computing/i … 0Guidelines.PDF on the board to at least 8.2 one https://kentie.net/article/deskproupgrade/vrm8.2.pdf

Open Source AT&T Globalyst/NCR/FIC 486-GAC-2 proprietary Cache Module reproduction

Reply 3 of 3, by k9cj5

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rasz_pl wrote on 2023-10-18, 04:46:
You forgot to describe the problem - does it not boot? That would mean older VRM design and you either need: […]
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You forgot to describe the problem - does it not boot? That would mean older VRM design and you either need:

1 socket 370 P3 + slotket adapter with Voltage selection jumpers to force CPU into running at 1.8V
2 mod your Slot1 P3 with tape and soldered bridges to force it into 1.8V
3 replace 8.1 VRM https://cdn.preterhuman.net/texts/computing/i … 0Guidelines.PDF on the board to at least 8.2 one https://kentie.net/article/deskproupgrade/vrm8.2.pdf

I finally had some more time to work on this project and I was trying to make sure that I had all the jumper setting correct before I tried using that CPU. When I plugged it in and turned it on it just worked so you were 100% right. I just didnt want to brick anything. These parts took me so long to find 🤣. Thanks again for all your guys help.

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