Reply 59 of 75, by gerwin
- Rank
- l33t
Finally obtained a Klamath core Pentium II.
It is a 233MHz part, SL2HD, Malay, Produced week 08 1998.
Tested this processor on an i440BX board, the Asus P2B rev 1.04. With its VRM chip replaced and an AGP divider jumper added.
I found multiplier jumper BF3 is ignored, jumpers BF0/BF1/BF2 work like this:
BF0 BF1 BF2
O - X - O -> No Post
O - O - O -> 133/66MHz (2.0x), No L2, Speedsys 154,80
X - X - X -> 133/66MHz (2.0x), No L2, Speedsys 154,80
X - O - O -> 133/66MHz (2.0x), 512kB L2, Speedsys 154,80 <--- !!!
O - X - X -> 166/66MHz (2.5x), 512kB L2, Speedsys 193,52
X - O - X -> 200/66MHz (3.0x), 512kB L2, Speedsys 232,26
O - O - X -> 233/66MHz (3.5x), 512kB L2, Speedsys 270,98
X - X - O -> 266/66MHz (4.0x), 512kB L2, Speedsys 309,70
(O means 1-2 is jumpered. X means 2-3 is jumpered.)
Now other people have done this before, but there were some doubts about wheter L2 cache remains functional at 2.0x on an i440BX.
As to the upper limit: This CPU runs 300MHz @ 100FSB and 266MHz @ 133FSB, but does not boot at 350MHz @ 100FSB or more.
For changing the FSB speed on several i440BX mainboards there is also a DOS program, which also works in Windows 98: SMB by Rayer. Combined with a Dos Batch selection menu it works like SoftFSB did. Tested OK with PLL chips of the type ICS9148xx-26 and ICS9150xx-08.
Edit: corrected processor speed
.
--> ISA Soundcard Overview // Doom MBF 2.04 // SetMul