My first PC was 8086 (or whatever it was called) with a separate math coprocessor and those big 5 1/4 FDDs, and then a 286, a 386DX (I think 33 Mhz), then a 486DX4-100Mhz, P MMX-166Mhz, P2-300 Mhz, P3-667 Mhz (I think), then a P4-Northwood 2.4Ghz, C2D E6600, and Q8400. The VGAs I went through were TNT, TNT2, Geforce 440MX (or whatever it was), Geforce 4 Ti4200, 9600GT, Radeon HD5770.
On the notebook side, I've gone through few as well, from P4, Pentium M (1GB with some Mobility Radeon with 32MB), C2D P7350 (3GB with 256 MB Geforce 9200GS), and now SNB Q2630 (8GB with 1GB Radeon 6770M).
Frankly I don't exactly remember how much RAM I had over the years, the 286 had I think 1MB, 386 had 4 MB (remember it was pretty damn expensive back then), 486 had 8 MB I think, P1 had 64 MB (I think), P2/3 probably similar as well, P4 had 1GB to start with, but it was upgraded to 2GB later on, C2D had 6GB. C2Q have 4GB (due to only two DIMM slots available on replacement board).
Phew, that was surely a trip down the forgotten memory lane ......