Here are some bench results
(AMD K6-III+ @600 MHZ GA-5AA 525)
I added the Tseng and Voodoo for reference, both fast cards as well.
The Tseng is on par with the GD5480, but the GD5480 has superior compatibility.
From dosbench:
Doom High details
GD5480: 121.45
Tseng labs 6100: 121.45
Voodoo 3 3000 PCI: 104.46
Ark 2000PV 2mb: 117.07
Chris 3d 640x480
GD5480: 91.6
Tseng labs 6100: 91.4
Voodoo 3 3000 PCI: 71.9
Ark 2000PV 2mb: 99.5
pc player:
GD5480: 179.3
Tseng labs 6100: 196.4
Voodoo 3 3000 PCI: 194.5
Ark 2000PV 2mb: 185.3
pc player 640x480
GD5480: 63.1
Tseng labs 6100: 63.3
Voodoo 3 3000 PCI: 42.8
Ark 2000PV 2mb: 55.7
Quake:
GD5480: 105.5
Tseng labs 6100: 108.7
Voodoo 3 3000 PCI: 108.6
Ark 2000PV 2mb: 105.9
Quake 640 x 480
GD5480: 30.9
Tseng labs 6100: 29.6
Voodoo 3 3000 PCI: 26.1
Ark 2000PV 2mb: 20
Build-games:
Duke3d 640x480
GD5480: 87
Tseng labs 6100: 87
Voodoo 3 3000 PCI: 67
Ark 2000PV 2mb: 75
Duke3d 800x600
GD5480: 57
Tseng labs 6100: 57
Voodoo 3 3000 PCI: 44
Ark 2000PV 2mb: 47
Blood 800x600
GD5480: 36
Tseng labs 6100: 36
Voodoo 3 3000 PCI: 24
Ark 2000PV 2mb: 31
Redneck 800x600:
GD5480: 43
Tseng labs 6100: 43
Voodoo 3 3000 PCI: 36
Ark 2000PV 2mb: 36