here's the skinny off volvo's website. at least in the u.s.

1993: 850 glt, 2.4L normally aspirated engine (168 hp)
1994: 850, 2.4L normally aspirated engine (168 hp)
----- 850 Turbo, 2.3L mitsubishi turbo-charged engine (222 hp, 9.6psi)
1995: 850, 2.4L normally aspirated engine (168 hp)
----- 850 glt, 2.4L normally aspirated engine (168 hp), diff in trim and equip.
----- 850 Turbo, 2.3L mitsu turbo engine (222 hp, 221 lb-ft, 9.6 psi)
----- 850 T5-R, 2.3L mitsu turbo engine (240 hp, 10 psi, limited edition, upgraded suspension and tire/wheel package)
1996: same as 1995 except t5-r.
----- 850 R, 2.3L mitsu turbo engine (240 hp, 10 psi, not limited anymore, similar to t5-r except no yellow)
1997: 850, 2.4L normally aspirated engine (168 hp)
----- 850 glt, 2.4L mitsu turbo engine (190 hp, low psi like 4 or 5)
----- 850 t5 (aka turbo), 2.3L mitsu turbo engine (222 hp,9.6psi)
----- 850 R, 2.3 L mitsu turbo engine (240 hp, 10 psi)
1998: s/v70, 2.4L normally aspirated engine (168 hp)
----- s/v70 glt, v70 xc, v70 awd, 2.4L mitsu turbo engine (190 hp)
----- s/v70 t-5, 2.3L mitsu turbo engine (236 hp, 243 lb-ft, bigger turbo)
----- v70 R awd, 2.3L mitsu turbo engine (236 hp, 228 lb-ft, s70r not in u.s.)
----- *factory option ohlins 8-way adjustable shocks with remote resevior, $1600
1999: s/v70, same as 1998
----- s/v70 glt, s/v70 awd, v70 xc, 2.4L mitsu turbo engine (190 hp)
----- s/v70 t-5, same as 1998
----- v70 R awd, 2.3L mitsu turbo engine (247 hp, 243 lb-ft)
2000: s/v70, 2.4L n/a engine (168hp, torque up from 162 to 170 lb-ft)
----- s/v70 glt, s/v70 awd, v70 xc, 2.4L mitsu turbo engine (190 hp)
----- s/v70 t-5, same as 1998
----- v70 R awd, 2.3L mitsu turbo engine (261 hp, 258 lb-ft)