Asus CUV4X-D 32bit pci slots>64 bit??possible?

I noticed my mobo has 32bit PCI slots...for running my Adaptec 39160 at full rate (160mb/s) it needs 64bit pci slots...Is there any way to get this??
Or is that impossible..
with 32 bit max rate is 133mb/s..

64-bit comes in to flavours :

AGP and 64bit PCI slots which are usually in servers