On PCIe 1.0, does a 64 bits graphic card could be compatible with 32 bits OS (Windows 7 32bits)

On PCIe 1.0, does 64 bits graphic card could be compatible with 32 bits OS (Windows 7 32 bits) ?

Is there any restriction?

Edit:

Few peoples told in comments that bitness should not be an issue. If I understand well, it is only a question of is there any supported drivers for the specific OS (here Win 7 32 bits) ???

Edit2: I finally bought a 64bits graphic card with PCIe 1.0 interface and it work nicely on my Windows 7 32 bits... Thanks to all !!!

Answer

The bit width of the bus (PCI, PCI-X, AGP, PCIe, etc) has nothing to do with the processor word size. It is simply the number of bits the communication channel can carry at a time.

The southbridge (now part of the Intel PCH or AMD chipset) handles the communication between the CPU and expansion cards (including video cards), so the bit width of the bus does not create any restrictions on the processor architecture.

Ultimately, whether your system can use the cards attached to your computer's expansion slots comes down to whether appropriate drivers are available.