The very earliest computers held their essential operating systems in Read-Only Memory (ROM’s). This was before disks came along. The instructions for, say, reading from a cassette, reading from the keyboard and displaying on the screen, were burned (programmed) into a ROM.
Solid-state drives are tending back that way, a fast way to store and retrieve the operating system, very rarely written to and often read from – essentially Read-Only Memory.
What I found in my recent system-building adventure is that while a lot of things are faster, they’re not enough faster to really make any noticeable difference. I found this to be so in case after case.
The difference between the AMD Athlon II processor and the Phenom processor is that the latter has a Level 3 (L3) cache. Does this really make a difference? Well, yes, measurably, but not enough that you’re going to notice any difference in day-to-day operations. You’ll save a lot of money on the difference.
The fastest Intel processor is a LOT faster than the fastest AMD processor, but that fast Intel costs over a thousand dollars US. AMD still gives you much more bang for the buck at middle range.
You can get a processor with four cores, but nobody has ever demonstrated appreciably better application speeds at four cores vs. two cores. Two vs. one, yes, but not four vs. two. Now that may be a software issue, and future applications may use the other cores more efficiently, but that hasn’t happened yet. It’s a gamble whether it will. Meanwhile, two cores are definitely worth the money, four cores, maybe not. (I went with four anyway, because of the terms of the deal I got.)
DDR-3 memory comes in a variety of speeds, with the faster being increasingly expensive. But the difference between memory rated at 1333 and 1600 is tiny. You won’t really see the advantage of DDR 3 over DDR2 until speeds get above 1800 or so, but that’s very pricey still. I concluded that paying extra for 1600 speed is just not worth it
So also with SSD speed over fast SATA-2 speed – just not enough to be worth the money. As the price drops, as the drives get more reliable, someday SSD may be worth doing as your OS drive. Not now, though.