windows 64-bit compatible (link)

Asus - GeForce 9500 GT 1GB DDR2 PCI Express Graphics Card - EN9500GTDI1GBBY

will this in in 64bit w7

Yes it will, just get the drivers directly from Nvidia. Also you can get that card for $20.00 less here,

Newegg.com - ASUS EN9500GT MAGIC/DI/512MD2/V2 GeForce 9500 GT 512MB 128-bit DDR2 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card - Desktop Graphics / Video Cards

has less memory on it but that card isn't powerful enough to use 1 GB, 512 MB is more than enough.

what do you mean it is not powerful enough to use 1 gig?

Just what I said, it is a low end card more for light gaming (unless you like slideshows don't try running a game like Crysis at anything more than all low/off settings) and multimedia use. by not powerful enough, have a look at the results for it here,

techPowerUp :: Galaxy GeForce 9500 GT Overclocked 512 MB Review :: Page 1 / 28

that is with the 512 MB version.