Can you specify what memory and timing are you running, try Orthos instead.... I assumed you are using 1:1 at DDR800, try to increase a notch of Vdimm and retry Orthos Large FFT. Good luck

You don't have to run two copies of Orthos, just run one copy is good. What is the Vdimm applied? Try tighter timing instead.... Probably 4.0-4-4-12 at 2.0v or 2.1v

hw much vdimm u feed? 

Try increase yr Vdimm =+0.3 and Vcore to around 1.375 or even 1.4..Remember to lock yr PCI freq to 100MHz ....Use TAT to measure CPU temp...

U had to try yr own on that...I suggest leave all to normal first...changing too much variable will confuse U more...

P/S: Interested to know yr temp @ TAT...do let us know ya?

Wow...hot hot .     ...66C at Default vcore =1.325v? if yes, U might need to do something on the stock HSF...

Yeah, that's very hot... Maybe you should try to get the temperature right first before trying to push the proc... I would use the TAT's function to load both the cores cause they produce a higher max temperature compared to running 2 Super Pi or Prime

Make sure you apply enough to cover the entire processor's heat sink, evenly spreaded out with a card, the coating should  be evenly distributed with a thickness of probably 0.5-1mm. Thermal paste often require up to 1-3days to 'dry up' to reach maximum performance...

got 2 methods i know off:
1) AS5 official guide which I normally use AS5 application guide
2) Other method is "In the center of the cpu heatspreader, put a drop of thermal paste the size of one bb. Then just squish it down with the heatsink, lock your heatsink in"

GL

hot ka?? i dont thinks so. on air cooling it should be normal 
same as mine here :

66 is normal for the stock HSF because u r running it @ full load.

but then u r using stock HSF ler..

My rig quite similar to your setup, basSist.

I'm using Mushkin 1Gb x 2 at 800Mhz 1:1 5-5-5-12 at 2.1v. Currently running at 3.2Ghz running on AlphaCool water cooling at stock voltage. CoreTemp idle at 42 degrees load at 50 degrees

I am using Intel Stock Cooling and same speed with yours (400x8) . Idle 55-57c. vCore 1.4, the rest +0.2. Very loose timing. Using Kingston valueram. Full load with orthos 67c. If wanna go to (450x8) then vCore need around 1.5. Full load will be 82c.

Using Proc E6400 and DS3 @ F7 bios. Intel Stock Cooling.

That setting was a stable setting. Orthos 18hrs without fail.

using a e6400 @ 3.2GHz @ 1.25V Vcore.

hmm guess i was wrong..... i thought tht wasn't it, prime95....it doesn't look like the one with the big GO which u all use...

okay, then i need a guide on using this software
[attachmentid=162773]

my e6300@ 2.4Ghz 63'C idle 80'C full load from TAT
but EasyTune shows 53'C idle 70'C full load, which one more accurate...
mean time i better change back to stock speed, anyway to lower temperature using stock fan?

where can i get orthos?

@basSist
Can ur E6400 go beyond 400 FSB?? how much vCore needed??

wow...very nice....
i run mine 400 x 7 @ 1.25v now..set in bios..stil priming orthos to test stability...
cpu-z shows 1.248v    but whn priming orthos it shows 1.232v 
fluctuation? 

eh.. E6400 not stable when >400fsb?
I am planning to upgrade to E6400 now, hope can get higher OC. Now my E6300 can only hit 440fsb. But im not satisfy . I tot E6400 can easily hit 400fsb.. i sold my E6300 alrdy 

Yes i know E6600 is better bocoz hv higher multiplier.. but i dont need 4GHz clock speed for now. Previously my E6300 can hardly reach 3Ghz, its alrdy sufficient for normal use. Really fast enough.
Reason i wanna get E6400 is just wanna get a proc tht can easily hit > 3.2GHz, thts all.. nothing more.
Moreover, i only need to op up RM60 to get a E6400 after i sell my E6300 with RM600. If E6600 i nid top up few hundreds.. sakit hati 
just Oc for fun  and like goldfries said, Better proc is good for benchie, but normal use E6300 got not much different with E6600.