Hi, The no_block_write option in the Mach64 server was introduced in patch level 2. I've checked the patch but since I still haven't found any technical reference to Mach64 based cards I don't exactly know what it means. What I've seen is that the option causes the server not to use the block write option when initializing the card when using VRAM based cards (The option has no affect on DRAM based Mach64 cards). Nir