How to remove this heatsink?

[watercooled]

Does anyone know how to remove this type of heatsink?

Thanks

[matty-hodgson]

Socket 478.

you see where that big 'AVC' stamp is.. push down and on that and the whole thing will just 'unlock'

[Aez]

Push down on the metal tabs and unhook it by moving the tab towards the fan

[TAKTAK]

Yup, as mentioned, and it'll prolly need quite a bit of force pressing it to remove it.

[watercooled]

OK thanks for your help

[MikeCorruption]

Hmm ive tried and no success

[Sputnik]

It is exactly as has been said, Personally I would remove the motherboard from the case and lay it on a flat firm surface so you don't bend the board too much then use a screwdriver to apply downward force in the depression(just inline with them capacitors) on the retaining bar, Then you can just use the AVC marked lever to unhook it.