Mobo for 770 upgrade to a PII

[paulchr]

I'm interested in upgrading my 770 -1AU to a PII. I tried a PII 366MHz/256K-L2 Dixon and a PII 300MHz/512K-L2 and they both work... with the Esc/F1 keystrokes needed to boot Windows. I ran the setup diagnostics and the error for both P-IIs is the same and appears to be related to the CPU fan test (based on observing where the System Board test halts when running in verbose mode). The experience was identical to another I read about while Googling:

http://www.computing.net/cpus/wwwboard/forum/11053.html

What's interesting is that both PIIs overclocked nicely at the max FSB possible w/o crashing and the fan never came on. What's weird is that the original PI boots/works perfectly, passes all tests (fan test successful with high/low/off tests), fan comes on briefly during every POST, but never comes on in Windows, even while running a 100% max CPU torture test indefinitely -- things get toasty but never crash.

Anyway, I'm thinking that there are several versions of 770 P-I motherboards since there are reports of successful upgrades to P-II, and I might have something wrong with my mobo to begin with (unless the CPU fan function is messed up on the DC-DC card to keep it from cooling in Windows). There's a 30L2527 System Board available online that's described as a replacement for 12J0405, 05K3456, 10L1559, 10L1574, 10L1747; all flavors of the PI board the 770 shipped with I assume. I think the 30L2527 was released later as a replacement based on the P/N. Has anyone actually tried this board with a PII? I'm thinking about getting one (as a minimum it might fix my PI CPU fan issue in Windows, if it's not the DC-DC card) but it'd be great to know how the mobo works in advance with a PII given the PITA it is to replace it.

[codestar7]

check your L2 cash is it "on die"....

[paulchr]

check your L2 cash is it "on die"....

Point being what? For mobile P-IIs, the 256K L2 cache is on-die and the 512K L2 is off-die so I tried both with the same effect.

I've since bought a donor 770ED base assembly and moved the guts, including upper/lower shields, to my 770. Originally a PII 266/512K, it works perfectly with the 366MHz Dixon CPU. Boots w/o errors, cooling fan works just fine, with the 4M video board, 770ED DC-DC card (supposedly better than the 770 version) and bigger fan/heatsink as nice extras. Cost of the upgrade was $25 spent on Fleabay plus a little time... The only bummer is the ED mobo does not OC using SoftFSB. It looks like it the FSB speed goes up but no response from the CPU clock. The 366 overclocked to 440 in Windows nicely with the original 770 PI mobo.