Can I add two 4-GB RAM cards to my late 2008 13-inch Macbook?

Currently I have two 2-GB cards but want to upgrade. I have an Intel Core 2 Duo processor that is 64-bit. Am I already maxed out on RAM for this machine? Would love to add more somehow. All idea welcome.

Details on the cards:

BANK 0/DIMM0:

Size: 2 GB

Type: DDR3

Speed: 1067 MHz

Status: OK

Manufacturer: 0x80CE

Part Number: 0x4D34373142353637334448312D4346382020

BANK 0/DIMM1:

Size: 2 GB

Type: DDR3

Speed: 1067 MHz

Status: OK

Manufacturer: 0x80CE

Part Number: 0x4D34373142353637334448312D4346382020