I found a guide to understanding DFI's nForce4 memory settings (it works with my nForce3 board). Now that I'm playing with it all, I'm trying to figure out how to hone in on the rogue setting that's stopping me from doing memtest. I've managed to find a BIOS to fix the CPU multiplier glitch I've had for years and I'm finally posting at 250FSB. Computer specs are as posted at the left. CPU specs are: FSB: 250 AGP: 66MHz HT Multi:3.0 CPU Multi: 9 CPU VID: 1.5V VID Special: 100% Chipset Voltage: 1.7v AGP: 1.5v DRAM: 2.8v Mem specs are manually set to: DRAM Frequency: 200MHz (1/1) CPC: Disabled (2T) tCL: 3.0 tRCD: 4 tRAS: 9 tRP 4 tRC: 15 tRFC: 17 tRRD: 3 tWR: 3 tWTR: 2 tRWT: 3 Refresh: 3120 cycles tWCL: 1 Bank Interleave: Enabled Increase Skew: 128 (also trying 192) Drive Str: Level 3 (also trying 4) Max Async: 8 us Read Preamble: 5 us IdleCycle: 16 cycles Dynamic Counter: Disable R/W Queue: 16x Bypass: 6x 32 byte granularity: Disable My question has two parts. One: Does anyone see anything odd with this setup? Two: Does anyone have any suggestions to figure out what is making memtest fail to load? (It loads at 240) My theory is to tighten up timings one by one until 240 FSB breaks. Is there a smarter way to do this?