Refer to xkcd's Car Model Names or this will make no sense. A better explanation of how the scores are calculated can be found in that comic's xkcd explained.
For example, the GTX 980 is +27 -18 +126 -37 -67 +60 = 91 / 6 = 15.16 / 10 = 1.52
Using the same scores that xkcd uses for car model names, let's see what scores various video cards get:
Nvidia:
GTX Titan X (+1.60) Titan is a totally negative word
GTX 980Ti (+0.65)
GTX 980 (+1.52)
GTX 970 (+1.66)
GTX 960 (+2.73)
GTX 950 (+3.86) Hey, this is going backwards
GTX 780 (+1.16)
GTX 680 (+2.23)
GTX 580 (+3.36) Nvidia's best line name ever?
GTX 550 (+5.71) Nvidia's best card name ever?
GTX 480 (+2.72)
GTX 280 (+2.23)
GTX 880 (+1.01)
GTX 380 (+3.05)
GTX 180 (+0.90)
8800 GTX (+1.72)
8800 Ultra (-1.04) only negative score I've found so far
9800 GTX+ (1.89) the + has no score but counts for dividing by 8
GTS 250 (+2.73) ha ha
GTX 1080 (+1.62)
If I had to choose the next line name, I would drop the T for another X
GXX 1080 (+4.30) see, way better
GXX 1050 (+5.70) still not as good as the almighty GTX 550
I'm tired now. I'll let an AMD fan calculate their model number scores and try to find a card name that beats the GTX 550.
For example, the GTX 980 is +27 -18 +126 -37 -67 +60 = 91 / 6 = 15.16 / 10 = 1.52
Using the same scores that xkcd uses for car model names, let's see what scores various video cards get:
Nvidia:
GTX Titan X (+1.60) Titan is a totally negative word
GTX 980Ti (+0.65)
GTX 980 (+1.52)
GTX 970 (+1.66)
GTX 960 (+2.73)
GTX 950 (+3.86) Hey, this is going backwards
GTX 780 (+1.16)
GTX 680 (+2.23)
GTX 580 (+3.36) Nvidia's best line name ever?
GTX 550 (+5.71) Nvidia's best card name ever?
GTX 480 (+2.72)
GTX 280 (+2.23)
GTX 880 (+1.01)
GTX 380 (+3.05)
GTX 180 (+0.90)
8800 GTX (+1.72)
8800 Ultra (-1.04) only negative score I've found so far
9800 GTX+ (1.89) the + has no score but counts for dividing by 8
GTS 250 (+2.73) ha ha
GTX 1080 (+1.62)
If I had to choose the next line name, I would drop the T for another X
GXX 1080 (+4.30) see, way better
GXX 1050 (+5.70) still not as good as the almighty GTX 550
I'm tired now. I'll let an AMD fan calculate their model number scores and try to find a card name that beats the GTX 550.