Where to purchase External SRAM?

I would like to know if external SRAM banks are on your motherboard and accepts it, if it is not installed, will it prevent my VGA from working?

Where can I purchase 256 or 512Kb SRAM?

I purchased a motherboard from the computer show, configured the jumpers, the onboard vga and sound and installed 2-32MB simm modules and all other required devices, but when i powered it up, it seem to be running post, but no picture.

The manual stated that the PAM-00631 Mainboard has a built-in cache controller, It requires external SRAM as Tag and data memory. I have never seen this before.

please help Rashidah@aol.com