PXIe-8135 PXI Controller RAM for Controllers—Upgrade/Spare RAM for PXIe-8135 includes RAM chips to help you upgrade the memory read and write rate of the PXIe-8135 and PXI-8119 PXI Controllers. You also can replace the existing RAM. Upgrade/Spare RAM for PXIe-8135 is available in either 4 GB or 8 GB options.