PXIe-8820 PXI Controller RAM for Controllers—PXIe-8820 Memory includes RAM chips to help you upgrade the memory read and write rate of the PXIe-8820, PXI-8820, and PXIe-8115 PXI Controllers. You also can replace the existing RAM. PXIe-8820 Memory is available in either 4 GB or 8 GB options.