My friend, whom I bought this kit wrote to me, that this kit won't work in his A3640.
Another friend have a problem with ROMY 4000. It won't work too. Both bought from Cosmos.
Instead of saying just this, why not give more information? did your friend make a mistake? what revision A3640? what A4000 motherboard revision? Does your friend have a idea why it will not work?
what you say doesn't help much.
Cosmos makes good stuff for the most part but these are hacks
and your milege may vary.