I have ran a test with many machines.. And will be posting all the results along with the picture that was rendered.. But from what I can tell it all comes down to "Floating Point Calculations" (ie..number crunching power) and "MHZ", ram does come into play but seems to stop making a difference after 256megs. The K6-2 sadly has very poor FPC, I was running a 450mhz AMD and went upto a 533 Celeron..cut render times in 1/3rd,now I run a much faster CPU and tons of memory but it hasn't really sped up render times that much. So I guess adding another 128megs could help but where I would spend the money is on a better CPU if your motherboard allows it. Keep an eye out for a post coming up in about a week on the differences, it will show the CPU's, Memory and render times they had. Hope that helps you a little.