Man, you must've been really clueless when you bought this comp! Or was it not you?
Northwoods can be found by checking the cache size, that's the easiest way. Or check the place where you bought it, or the retail box, it should have said 1.8A or at least specified the cache. Get WCPUID to easily determine once and for all.
As for SDRAM, even OCing won't give it much, considering 1: SDRAM kills P4s, 2: Intel mobos are usually less performing, so now you got to OC so much to get some performance improvements or similar performance to regular RDRAM P4s.
As for PSU, man that is weak! I'd recommend 300-350W, to ensure future upgradability, like if you wanted to change video cards, add hard disks, CD-ROMs, etc. Possible that OCing could use more W and the PSU may not support it.
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Intel and AMD sitting under a tree, P-R-O-C-E-S-S-I-N-G!