I have a new Asus A7VT Terminator barebones system and 2 identical sticks of TwinMOS 128MB PC2700 DDR-DIMM. The CPU is an AMD Sempron 2400+.
The PC will POST fine with 1 DIMM installed. It doesn't matter which DIMM or socket used. The Award BIOS recognizes it as DDR333 and the BIOS will automatically set the DRAM frequency to 166MHz. If I install a second DIMM, though, the PC will not POST. I've tried manually setting all the timings to safe values and tried the BIOS's preset "Safe" timing options. The only way I can get it to POST with the 2 TwinMOS DIMMS is to manually set the DRAM freqency to 133MHz.
I tried the 2 TwinMOS DIMMs in another PC and it worked fine at 166MHz. I tried 2 sticks of Buffalo PC3200 256MB DIMMs with the Asus and it worked fine. It seems to be something with 2 TwinMOS DIMMs and the Asus MB.
Asus support hasn't called me back as promised after all their techs were busy.