Hello,\nI bought my 503+ in 1998. My manual is for version 1.1 of the\nboard and I have version 1.2A. After a few years I upgraded and gave\nthis computer to my grandmother. Now she's upgraded and I have it\nback. It had a k6/2-333 in it, but I found a k6/2-450 to use. I can\nnot get it to boot with the 450!\n\nHere's the original jumper settings:\nCLK1: 1-2\nCLK2: 1-2\nCLK3: 1-2\nCLK4: 2-3\n\nFREQ1: 1-2\nFREQ2: 2-3\nFREQ3: 2-3\n\nSDRAM1: 2-3\nSDRAM2: 2-3\nSDRAM3: 2-3\n\nSo I guess I have 66mhz RAM in there. I understand there's two\nk6/2-450's versions(?) BUT I only had the 333 heatsink. I had an old\n2500+ heatsink laying around, so I used that for the 450. It was\nEXTREMELY difficult to get on, and I'm afraid I can't get off now\nwithout damaging the board, so I can't read which version it is.\n\nI went to [URL]http://home.t-online.de/home/kai_kramer/503+.html[/URL] and found\nthe jumper settings there, but I'm afraid I don't understand the\nRAM-Speed and Divisor setting. It lists:\n\nRAM SPEED: AGP = SDRAM1 1-2 and CLK4 2-3 OR\nCEF = SDRAM1 2-3 and CLK4 1-2 (no other options)\n\nHowever my original settings setup was 2-3 and 2-3.(??)\n\nCan anyone make sense of this mess?