Asus 4770 - strange problem.

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Hey all , just installed windows 7 64 bit and latest CCC Build + drivers.When I try to overclock the 4770 I reach 840 mhz / 1000 mhz / 1.04 voltage.This is fully stable and is able to run for a prolonged time in Furmark Xtreme burning mode.Everything seems fine except when I was using windows XP i was able to get 930 mhz / 1000 mhz / 1.05 voltage.Anything above 840 mhz on windows 7 results in a crash asap.So what gives?Is windows 7 the problem or my card just got worse?Its a Asus 4770 , im using SmartDoctor to change the voltage.Temps are 38-40 on idle when clocked.The memory is not the problem I tested that - ran on 750 mhz / 1000 mhz for 10 mins in furmark.Im really confused how such a big difference can happen .Hope someone here can help me out.Thanks in advance.

 

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Anyone?
Also the only difference I can recall is that I had VPU Recover disabled in XP,but in Windows 7/Vista its build-in in the OS?How Do I Disable it?

 

[shovenose]

are u sure u were using the same version of CCC?

 

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I don't think so.I'm using the latest one and back then I used the latest aswell(back then=2-3 months ago) so I guess they got updated.Anyway Im not using CCC to overclock,I'm using RivaTuner.
It's getting silly tbh.Now its not even stable with 830 mhz / 850 memory(the max in ccc/smartdoctor) sigh

 

[shovenose]

is it stable at stock speeds?

 

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Yes.Played at stock speeds Modern Warfare 2 for 2-3 hours last night,no crashes , no artifacts.At 830/850 my screen started some yellow flickering.Also I'm running Windows 7 64 bit with 2 GB ram only.Could this be affecting the whole system somehow?
CPU is Athlon x2 3800

 

[shovenose]

well i dont hink the amoun of ram u have is affecting thegraphics card, neither ur cpu.

 

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Yeah , well I'm out of Ideas.Guess I'll just live with it ;/

 

[shovenose]

LOL sorry