It does sound like your RAM is holding you back from higher FSB settings. If you really want to go higher, you will probably have to put your RAM voltage to the max and raise your RAM timmings a bit. However I am not convinced that higher FSB settings will yield better gains in speed as opposed to slightly lower FSB settings and higher multipliers.
Definately remove that NB aluminum block and put an active HSF on it. I use a Blorb and others swear by Iceberq. Both will do the trick.
Only thing left after that is higher Vcore settings..... but with a HSF solution, you will be getting very close to hazardous core temps.
If you MUST get your 18K......invest in a FX 5900... (only if you absolutely must)
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Athlon64 X2 4200+ @ 2.5Ghz (250FSB x 10)
OCZ VX 1GB 4000 @ 250FSB (6-2-2-2 timmings)
DFI LANParty nForce4 Ultra-D
SCSI Raid 5 x (3) Cheetah 15K HDDs
LSI Express 500 (128MB cache)
OCZ PowerStream 520W PSU
ATI X850XT PE (Stock)
DTEK WhiteWater + DTEK Custom Radiator
Eheim 1250
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