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View Full Version : P3 VID (core voltage settings and more)

Nathan Detroit
06-25-01, 05:28 PM
P3 SECC Datasheets (http://http://developer.intel.com/design/PentiumIII/datashts/24445208.pdf)
Couldn't find VID pin configuration for more than 2.2v and got tired of looking, so I went to intel.com and searched for Pentium 3 VID. came up with this. Now can give more VccCore juice!
After going through it I can identify VccL2 input pins, is there a way of configuring these for giving the external cache more juice for higher stable speeds? If not, does anyone know of mods to motherboards for providing this? (Aopen AX6BC)...
batboy
06-26-01, 08:59 AM
Trust me on this one, you don't want to use more than 2.2v anyway, unless you like crispy CPUs.
Nathan Detroit
06-26-01, 10:44 AM
I'll clarify a little, the VccCore and VccL2 are seperate. I don't want to increase the VccCore anymore, I would however like to increase the VccL2 a little bit so that I can make that external cache a little more stable at the higher speeds. At 600 - 2.2 the whole system is stable with the cache turned off, with 2.4 I can turn the cache back on and it's stable. With more juice to the cache could I turn the VccCore back down to 2.2?
Phil
06-26-01, 10:58 AM
Have you cooled the cache?
Usually some cooling on the cache canhelp a lot. I don't think VccL2 can be increased withour increasing vcore unless you mess about with some resistors and unless someone knows which resistors controll it then I'm at a loss. Cooling the cache and the tag ram can help a lot though.
Nathan Detroit
06-26-01, 08:11 PM
Managed to score an old Pentium heatsink that has a large amount of fins per sq inch but isn't too tall, gonna hack it up tonight, lap it and try and find some way of attaching the pieces nonpermanently. I'll see if I can increase the L2 latency (currently 8) and still keep things stable.

Anyone else, on the increasing Voltage to the external Cache beyond 3.29v?
Nathan Detroit
06-26-01, 08:13 PM
Damned smiley face was supposed to say 8...

now it's 4 ( is that nanoseconds? )
Nathan Detroit
06-26-01, 08:49 PM
If this helps point anyone in the right direction:
On the circuit board, all VCC CORE pins must be
connected to a voltage island and all VCC L2 /VCC 3.3 pins must be connected to a separate voltage
island (an island is a portion of a power plane that has been divided, or an entire plane).

Taken from the intel document in the first post.