 It supported up to 256 Mb of memory with SIMMs using an industry standard form factor, double that of the previous model.The change from a proprietary SIMM to an industry standard SIMM was to lower costs, which also included reducing the size of the enclosure and more provisions for disks.The VAX 4000 Model 50, code-named ""VAXbrick"", was an upgrade for MicroVAX 3x00 or VAX 4000 Model 200.