CompuServe Messages

Hi all, I've installed two 70ns 16MB SIMMs to a computer that has two 60ns 16MB SIMMs and 3DS Rel. 4 crashes. Has anyone had success combining SIMM speeds? If so, any tricks to this? The system shows a successful memory bootup and 3DS shows that I have 64MB available but if I render a file that uses more that 32MB of RAM, the system crashes. Interestingly, all files that use less than 32MB render successfully. Any help would be appreciated, Thanks — Laurie