Possible to find BSEL2 (266MHz FSB) for P4 (socket 478)?

[pokipoki]

Is it possible to find BSEL2 from those reserved pins? Anyone with experience to share? Thanks.

[Tony]

478 has 3 settings, 133, 166 and 200 on the bsel pins, unless they changed something

[p0rl1n]

from section 2.9 of the p4 datasheet (link http://static.tigerdirect.com/pdf/I...d-Datasheet.pdf )

table 2-4

AD5......AD6
BSEL1...BSEL0..Function

L..........L........100 MHz
L..........H........133 MHz
H..........L........200 MHz
H..........H........RESERVED

could the last entry be 266 fsb on 478 pin cpus? it is on xeons 603/604pin. anyone ever try to insulate bsel0 on a 200 fsb 478 cpu?

[socrilles]

your chipset would also have to support it....not sure there are many that do for s478

[pokipoki]

from section 2.9 of the p4 datasheet (link http://static.tigerdirect.com/pdf/I...d-Datasheet.pdf )

table 2-4

AD5......AD6
BSEL1...BSEL0..Function

L..........L........100 MHz
L..........H........133 MHz
H..........L........200 MHz
H..........H........RESERVED

could the last entry be 266 fsb on 478 pin cpus? it is on xeons 603/604pin. anyone ever try to insulate bsel0 on a 200 fsb 478 cpu?

The last entry is 166MHz. These 4 FSB speeds & BSEL settings have been present since 100MHz processors (P4 & Xeons included). They have also remained the same from 100MHz to 400MHz processors.

Currently, only P4EEs have 266MHz but the BSEL0/1/2 settings & pins are the same for all LGA-775 processors (P4 5xx/6xx/7xx/8xx).

Which means all LGA-775 procs can be set to boot at 266MHz FSB (assuming the processor can sustain this OC). Instead of u-wire, maybe some other means of grounding the pins can be done. Conductive ink (which is reversible)?

Maybe the chipset (915/925) limitation can be negotiated by lower mem dividers?

Similar to Xeon Moosemod which boots at default FSB, go to BIOS & set slower memory speeds/dividers or multis (applicable for P4EEs). Shutdown to apply 266MHz pin mod & boot with new default FSB.

There's another aspect which I don't understand. Is VID[5:0] a requirement for 0.90u or exclusively LGA-775?

BSEL2 is tied to VID[5:0] for 266MHz on LGA-775, but there also VID[5:0] on socket 478 (e.g P4 2.8A) & on socket 604 (e.g Xeon Noconas).

VID[5:0] is also available on both 0.13u & 0.90u P4EE on LGA-775.

[pokipoki]

[b]@socrilles
Well done on your OC link1 (http://www.xtremesystems.org/forums/showthread.php?t=62471&highlight=bsel2) link2 (http://www.xtremesystems.org/forums/showthread.php?t=69913&highlight=bsel2)

[i found nemo]

any chance this working on 66mhz fsb celeron (pentium 3)