1. Lower down your HT Link Multiplier
2. Increase some Vcore by one increment and increase HTT by let say 5MHz each time.
[Use Orthos or others similar programs to test stability]

Be in mind that Windsy is hard to overclock compared to Brisby.
And if you do not mind, list out your hardware details for us.

-pWs-

Please download CoreTemp and monitor the temperature.
Windsy is hot especially on stock cooler. 

Do you add Vdimm for your ram? I assume that yours is KVR. SPD Timing should be at CAS 5.
Lower down your ram divider as well with the HT Link Multiplier

-pWs-

800mhz is just the rated MHz, you can always clock it up to where you rams leads you.

Yup...All current board only support 800MHz.
Nothing you have to change, just choose correct divider n PUMP htt.

-pWs-

Should be able to in theoritically
I think you need to pump some Vdimm to make 667 to work at 800. 

-pWs-

Depends on d9 for what? I not really understand.
If you wan both sticks to work together, it is possible IMO.

-pWs-

Why not? But a bit hard.
It is recommended to get the same spec ram.
Why dun you sell off your current 667 and get two 800?

-pWs-

Go for Crucial. I personally recommend it although i using Corsair XMS2

-pWs-

Im using Raptoxx 550w, its working pretty well with most voltage readings stable.
I believe my rig consume quite some power here, 2 HDD, 2X HD2600XT DDR4, 1.52vcore and 2.3v on my crucials.

IMO, its wayyy better than CM Extreme Power 450w, ive used the CM 450w before(the model with a voltage meter), it flunctuates alot when on full load where else my cheapo raptox works way better.

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Added on September 24, 2007, 11:33 pm

look for forumers selling Crucual 10th Anniversary rams, its a great bang for buck. RM440 2gb rams that can run 510Mhz with 4-4-4-7-11 @ 2.3 vdimms stable.

well, some says its the same some say its different. Then again, it doesnt really matter to me as it performs damm good. And again, the most important deciding factor, price. Rm440 for 2 sticks of 1GB, on the tracer series... u cant get much with RM440.

dont look down on the 10th anny bro, my friends who owns a DDR800 tracers wants to switch with my anny after seeing how it performs

CZBOX - Windsor F3
DDBOX - Brisbane G1
CUBOX - Windsor F2

-pWs-

good thing IF F3
bad thing MONEY~ for u i think dun have prob with money rite

thinking urself

Same. But sempronic processor case is different. 
Normal F2 overclock @ 2.5-2.6GHz

-pWs-

change when u need to OC more...if u want to feel 3ghz..can try get brisbane coz it is easy to reach that speed..but do not forget that brisbane cant compare to windsor speed when head to head same speed...windsor more fast...

how can i say either it is the same or not by just looking of the CPUz??heheh

my proc detail is
ADA3800IAA5CU
NDBET 0646AAA
X129912K60635
what is the case??i also not sure...hehehe