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how do i get rid of the noise.
my scene has a lot of lumi polys. kray setting QMC (HIGH) without changing anything. resolution 2400x1200. using dpsunsky plugin as environment. post process in photoshop, reduce image size to be able to attached here. thanks

Simple "brute" answer: render at double resolution, de-noise a bit in Photoshop and then change the image size to half the original size (which will reduce noise by 50%, but with a longer rendertime of course).

This is minimum for QMC:
But for high quality you must add more rays: 1000/0
Setting 2000/0 is extreme.
1000/0 means twice longer render then 500/0.
But there is trick: then higher resolution the less rays you must use. for 5000 pix sometimes 300/0 is enough (still noisy but better to clean).
For fast preview 100/0 is enough.

suggest u to use normal map on water its will give really nice effect .

Thanks for all your suggestion. the funny thing was, i thought when i used the uncached option (since it is set to higher quality) i wont get noise....but it came out more noise than "high" setting option.

will give a go on all your suggestion.