I've used the mentioned modded bios and it worked fine in my Acer ASE380.
I'm also experiencing the issue with adding RAM to the Acer. I can run 2x1GB in either paired banks fine, but as soon as I try to run all 4x1GB sticks it will try to load and reboot after maybe 30 seconds. It's doubtful the issue is with Vista. If I relax the memory speeds (thanks to the modded BIOS) to "maxmemspd" and set it to 667mhz max, I can get as far as windows trying to load for a few minutes then it just stops at a blank black screen indefinitely. Being able to change the motherboard settings to get more boot time out of the machine would indicate to me this is a motherboard issue. I know it's not the memory (g.skill PC6400) because 2 of the sticks of ram work fine, but 4 identical sticks won't.
With a new 5400+ processor on the way (to upgrade the 4400+ it came with) I'm keeping my fingers crossed I don't have to resell the new CPU too (already need to resell 2x1GB of RAM I bought).