Thanks for MAG79's reply
After changing the profile, it does improve and did not show any warnings, at least so far. i always set thread number to auto.
So it turns out that the original setting is somehow tough for my 4G RAM. (when installing SVP i just chose the intel i7 box and leave the default 1080p profile)
Despite of my i7 and GT330(well i know it's not very powerful comparing to other graphic cards..), maybe i should add another 4G RAM to deal with SVP...
And last, i need to say SVP really changed my visual experience ! So cool when everthing gets smoother than ever :
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