Following up with an update... RAM arrived on Wednesday. Installed it and booted into memtest86. Ran default test at PC2100 speed with no error. I was about to run it in PC2700 but since the RAM I received is rated at PC3200/DDR400, I set it to that speed and ran the default test. No errors. But I wasn't done yet. I wanted to make sure it truly is usable. So I set memtest86 to run the extended test. God that took forever. It found no errors. So I was good to go. Now for some interesting tidbits...
The PC2700 pair I received from them were Crucial's/Micron's own DRAM chips. It didn't surprise me much when I found that the PC3200 sticks weren't Crucial DRAM chips. Instead, they're Samsung's DRAM.
References:
Crucial's DDR400 512MB DIMM
Samsung DRAM product guide
Well, they match up quite nicely and they run at the rated speed. So now as I typed this, prime95 is running, temp is at 42c/107f (for the moment, case is open since I'm planning on doing some minor modding), and system is at 2700+ speed (166x13) and using default voltage (1.6v).
wcpuid screenshot
Needless to say, a user should not have to go through the hassle of replacing RAM. Well, Crucial's customer support is good to me. And getting faster memory didn't cost me a dime (the irony, having saved by the high price of PC2700 512MB memory when I purchased it). I wonder if I should try hitting 200MHz FSB.............. naaaah...