The memory upgrade made things worse on my system. Rendering in P4, I ran "out of disk space" in 1 day. Usually this takes a month or more. Rendering and Tailoring are both CPU and Memory Intensive. I get 100% CPU Utilization and 675MB PageFile Usage when I do both simultaneously. I'm Tailoring V3 Clothing and Rendering a clothed V3 Character. It's still an order of magnitude faster than Rendering in P5 FireFly!! My system -- Athlon 1200, 512MB RAM, 896MB Virtual Memory across 4 disk partitions.