As reported by others, G.SKILL memory will not boot on the DQ6 without voltage modification in bios first. As Lestat reported, the 2GB ZX kits needs 2.2V to just boot/get stable.
G.SKILL techs confirm it is safe to run said memory with 2.2.V, i have a cheap 256MB stick of Nanya DDR2 PC4200 memory. She allows for POST and bios modification, the voltage with the Nanya is 1.8V.
Set voltage manually to +0.400V (0.4V, standard 1.8 + .0.4 = 2.2V), manually change timings to 4-4-4-12 (this is nesscary and expalined below).
Be advised the memory gets very hot, i would recomend some air cooling such as this:
http://www.xoxide.com/neon-crab-memory-cooler.html
I have also heatsinks on the MOSFET's surrounding the DIMM slots and clock generators. There is also another quirk, if you leave the memory timings to Auto and look at CPU-Z it will at first report 4-4-4-12, other times it will report 4-3-3-10 and also 3-4-4-12...very weird.
So settings timings manually would be advised, and keep an eye on it to see if it changes. I'm using F3e and hopefully the bios will mature and fix some of the issues, it's a real PAIN to keep taking the memory out and swaping, and if you have to reset the bios for any reasons you'll have to start from scratch.
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