Please link to the spec that claims those timings will run at 1.8V.

Even with a 32 bit OS, at these prices one might as well max out the possible memory, and there are ramdrives that can use memory beyond what the OS can use, pretty useful if one assigns that to the temp file, browser cache, scratch space for certain apps. With that kind of use, it could even make sense to buy 8GB for a 32bit OS as it can save and reload ramdisk contents in some cases, you could even install apps to it and never again care about HDD speed.

http://www.superspeed.com/ramdisk.php

#21: Several newegg reviews note that this RAM can run 44412 timings at 800mhz with only 1.9v, and this has been tested in Memtest86+.

A greater than 15% decrease in clock speed should easily allow a 5% lower voltage.

Corsair doesn't say this officially , but it is extremely likely that it will work.

Also, like you and I both noted, getting 4GB of RAM will cost considerably more money, since it costs 300%-400% more, and will only provide 50% more usable memory to a 32bit os.

Very few people use a Ramdisk, and the software is fairly expensive to do that. The one you linked costs 1,000% more than this RAM costs.