I'm sorry i didn't explain very good. Your ram could be running on 5/4 ratio. (DDR333) This means it runs on 200 (fsb) x 1,66= 333 Mhz instead of 400 Mhz like it should be on stock speeds. 8,5K is pretty okay for stock speeds without enabling the memory accelerator option. But yeah you should be close to the 10K cpu barrier at stock speeds!
Be sure you run your ram set to DDR400 (1/1 ratio in other words in sync with the cpu) so your ram speed will be 200x2= 400 Mhz.
Maybe it's also an idea to look at updating some chipset drivers etc.
Also check out what your processor load is when you're running idle in windows.
If that's not helpfull too... then i need to know some specs about your motherboard. Can't really remember what hardware you got. Will read some manuals then. Then i could do some suggestions about the way to configure it, so you will get your old scores back.
EDIT:
A very simple way to verify if HT is enabled is just to start the task manager. (CTRL + DEL) Look at the Performance tab. You should see two fysical cpu's.
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