Tandy/Radio Shack TRS-80 model III - stock with a tape-drive, 16KB of RAM and a 2MHz Z80 processor
Commodore 64 SX-64 - stock with a floppy disk drive, 64KB and a 1.02MHz MOS Technology 6510 processor
Intel 80286 - stock @ 8MHz
Intel i386SX-25 - stock
AMD Am486 DX-66 - stock
Cyrix Cx5x86 (PR75) - didn't own long
AMD 5x86-133 - OC'd to 200MHz (yes, I was one of the lucky ones...)
-- joined Intel as an engineer --
Intel Pentium 133MHz - OC'd to 166MHz
Intel Pentium 200MHz - stock
Intel Penium w/ MMX Tech 233MHz - stock
Intel Celeron 300A - OC'd to 450MHz
Intel Pentium 2 600MHz - stock
Intel Pentium 3 550 - OC'd to 733MHz
-- hard disk crash, not very good backups, got paranoid --
Intel Pentium 4 1.6GHz - stock
Intel Pentium 4 2.2GHz - stock
Intel Pentium 4 3.2GHz - stock
Intel Core 2 Duo E6700 - stock
My father bought a TRS-80 back in... 1979? Something like that. It was about $1000 at the time for a 2MHz CPU and 16kb of RAM. When you turned it on, you had to go through a bunch of questions as I recall just to get to the BASIC command line. It didn't boot to a command prompt... instead you had to type a bunch of stuff... Originally it was my fathers, but when I started using it more than he did, it moved into my room. I used the TRS-80 for several years - I used to program on it in Basic and at one time I had a fairly sizeable "Zork" like text game coded up and saved to several cassettes.
But the TRS-80 was a pain to use, and the tape drive took forever. I saved up a lot of money and my parents contributed half, and I bought a Commodore 64. This was actually a pretty good computer for playing games on at the time. I still (rarely) fire up my C64 emulator and play games on it like Paradroid and Impossible Mission. I did a bunch of stuff with music and MIDI on it. I had the "portable" - think a 30lb laptop with a 5" CRT screen and no hard disk. It used a floppy drive. I used to dial onto BBS's and send email via EchoNET (think ancient internet - the kind the dinosaurs used) with my 300 baud modem. And then I remember getting a 2400 baud modem and thinking "wow. this thing is SO fast!".
Meanwhile my father upgraded to a 80286 - I'm pretty sure it had an Intel CPU but I'm not certain. He used this for several years as a business computer running Lotus 1-2-3 (old spreadsheet program). But when he upgraded to a 386, I inherited it and used it to program up games and play games. I clearly remember playing Ultima III on it.
The i386SX-25 was the first computer that I bought myself... I remember it was several hundred dollars. As I recall, it didn't have a heatsink - like no heatsink at all. As I recall, it was just a purplish/gray ceramic package... I had this computer for quite a while. It had a super fast 2400 baud modem and I used to play 'online' games like "Trade Wars" on BBS's in the Bay Area.
Then I got a DX2-66 - I can't remember if it was an IBM DX-66 (yes, IBM used to make x86-compatible CPUs), or an AMD one... I think AMD.
From the DX2-66, I upgraded to a Cyrix 5x86-100 (PR75, I think it was called). I don't want to speak ill of a design... but let's just say I had issues with it. I remember I sold it soon after I bought it and moved onto a much faster CPU.
I bought an AMD 5x86-133 and quickly overclocked it to 200MHz. This was actually a fairly rare overclock at the time. 160MHz wasn't too hard, but 200MHz took a nice cooling system and a special motherboard and memory. Of all the overclocks that I've done, I was most proud of this one. It was fast, it was reliable, it rocked.
Then I got a job with Intel. And suddenly my pride in my 66MHz (50%) overclock didn't seem like such a great thing to talk about with my new Intel co-workers. Soon enough, I sold the computer (I even wrote that it was overclocked in the advertisement in the San Jose Mercury News) and upgraded to a Pentium. At Intel I worked on the design of the 200MHz Pentium and I got a free CPU at the end, and then a Pentium w/ MMX soon after that.
Then I bought a Celeron 300A and overclocked it to 450MHz and I used this for a while until I worked on the design of the Pentium II - which I bought soon after (no Intel freebie for me on this one).
Then I bought the last CPU that I ever used for a while overclocked - an Intel Pentium III 550MHz which overclocked comfortably to 733MHz.
Then our daughter was born, I'd had some digital photos... and I had a bad hard disk crash. I didn't have much in the way of backups. it was not good. And that was the end of my overclocking. Overclocking had nothing to do with the hard disk problem that I had... at least I don't think so.. but the risk/reward equation shifted when I started having my taxes, my finances, all of our children's photos and videos, my band's recorded music, my entire CD collection, etc. didn't seem quite as compelling as when I didn't have a lot of money and all I had on my computer was video games. Now with all the stuff on my computer, I don't overclock. If the CPU is slow, I just upgrade. But I just want the computer to work 100% reliably 100% of the time. It's probably a sign of old age, but I just don't want to mess with it. And I backup like a crazy person.