VIDSPEED is a good indicator of raw bus transfer speed (unlike 3dbench and, god forbid, 'Landmark'). It measures the throughput of writing constant pixel data to video memory over the bus in graphics modes, and is more or less CPU-independent. Here's a table of results, in kilobytes per second, for typical modes with both 16-bit and 32-bit writes. A vidspeed number of '17011W' means 17 Mb/s for writes.
Results so far (sorted on score): Low Res Modes Card and bus 320x200 320x200 360x480 360x480 16-bit 32-bit 16-bit R 8-bit Score Herc. Stingray Pro (ARK) PCI 1Mb P100 26340 48907 23530 2207 46.98 Hercules Dynamite Power 2MB VLB DX2/66 22200 44401 16000 3700 41.18 Genoa Phantom 64 2M (S3-864) PCI P90 19835 36571 17924 1563 35.26 Genoa Phantom 64 2M (S3-864) VLB DX2/66 22230 33032 16300 2086 35.15 ET4000/W32p (2Mb) VLB DX2/66 16650 33300 16408 3780 33.65 Diamond Stealth 32 2MB VLB DX2/66 16667 33368 15128 3657 33.05 Mercury X1/VL 2Mb (S3-805i) VLB DX2/80 19980 29204 15445 2488 32.33 D. Stealth 64 DRAM (Trio64) PCI P90 19835 30739 15149 1525 31.78 Spea Mirage P64 (S3-864) 2Mb PCI P100 22051 27863 13806 1754 31.65 Cirrus Logic 5434 2Mb VLB SX/40 18024 35929 9460 2655 31.62 Diamond Stealth 64 DRAM PCI P90 19859 29879 14804 1699 31.48 Cirrus Logic 5434 2Mb VLB SX/33 16318 32572 9064 2406 28.85 Diamond Stealth Pro 2Mb (928) VLB DX/50 24380 16667 8333 2767 27.39 Diamond Stealth 64 VRAM 2Mb VLB DX2/66 19073 22629 10081 2039 26.56 Diamond Stealth 64 DRAM 1Mb PCI P90 18575 22914 10146 1519 25.88 ATI Mach32 2Mb VLB DX2/66 13298 26597 8579 2886 24.93 S3-805 VLB DX2/66 20634 12064 6030 2316 21.93 Cirrus Logic 5426 VLB SX/33 12497 12497 9839 2534 18.96 Diamond Stealth 24 (S3-805) VLB 15922 11077 5546 2391 18.59 Cirrus Logic 5434 1Mb PCI P90 (1) 10045 17264 8090 1740 17.90 LightSpeed W32p (1Mb) PCI DX2/66 7396 14800 7397 2655 15.97 Cirrus Logic 5428 VLB DX2/66 9508 9508 9223 2383 15.58 Orchid Fahrenheit 1280+ 1Mb VLB DX2/66 10126 9002 5177 1943 13.69 Trident 9200Cxr 1Mb VLB SX/25 6619 7386 4859 1303 10.17 ET4000 ISA DX/33 5259 6311 5261 1255 9.03 Diamond SpeedStar Pro ISA DX/40 5191 5191 5192 1409 8.67 Diamond Viper PCI 2Mb (Oak VGA) P100 4517 4608 2956 1223 6.95 Number 9 Imagine 128 PCI P60 3211 4044 3211 557 5.38 ET4000 ISA 3145 3145 3146 944 5.34 Diamond Viper SE PCI P90 2716 3173 2183 845 4.61 Trident 8900 ISA 2941 3006 1167 904 4.33 SVGA Modes Card and bus 640x480 640x480 640x480x16M 16-bit 32-bit 32-bit Score Diamond Stealth Pro 2Mb (928) VLB DX/50 24415 48901 48759 48.85 Hercules Dynamite Power 2MB VLB DX2/66 22186 44373 44373 44.37 Herc. Stingray Pro (ARK) PCI 1Mb P100 24997 45953 17203 41.01 Diamond Viper PCI 2Mb (Oak VGA) P100 12573 40320 40223 37.26 Cirrus Logic 5434 2Mb VLB SX/40 17843 35687 30946 34.73 ET4000/W32p (2Mb) VLB DX2/66 16656 33346 33346 33.33 Diamond Stealth 32 2MB VLB DX2/66 16656 33346 33346 33.33 Mercury X1/VL 2Mb (S3-805i) VLB DX2/80 19991 40031 1049 32.22 Cirrus Logic 5434 2Mb VLB SX/33 15444 30889 26923 30.09 Diamond Stealth 24 (S3-805) VLB 15360 30720 14726 27.52 Diamond Stealth 64 VRAM 2Mb VLB DX2/66 19235 19235 19191 23.07 ATI Mach32 2Mb VLB DX2/66 13312 26624 0 21.29 Genoa Phantom 64 2M (S3-864) PCI P90 18492 18616 10104 20.58 Genoa Phantom 64 2M (S3-864) VLB DX2/66 17080 17080 8681 18.81 Diamond Stealth 64 DRAM PCI P90 17097 17080 8659 18.81 D. Stealth 64 DRAM (Trio64) PCI P90 16557 16557 10615 18.68 Spea Mirage P64 (S3-864) 2Mb PCI P100 15588 15588 7242 17.03 Cirrus Logic 5434 1Mb PCI P90 (1) 9780 16874 11272 16.29 LightSpeed W32p (1Mb) PCI DX2/66 7398 14804 14804 14.80 Cirrus Logic 5426 VLB SX/33 13238 13238 6725 14.58 Diamond Stealth 64 DRAM 1Mb PCI P90 11895 11887 7700 13.43 Cirrus Logic 5428 VLB DX2/66 9508 9508 7350 10.97 S3-805 VLB DX2/66 5570 11144 7119 10.33 Orchid Fahrenheit 1280+ 1Mb VLB DX2/66 5539 11078 6632 10.18 Trident 9200Cxr 1Mb VLB SX/25 7155 8348 6260 9.12 Diamond SpeedStar Pro ISA DX/40 5191 5191 5191 6.22 ET4000 ISA DX/33 5259 6312 0 5.89 Number 9 Imagine 128 PCI P60 3210 4024 0 3.69 ET4000 ISA 3145 3145 0 3.14 Trident 8900 ISA 2941 3008 0 2.98 Diamond Viper SE PCI P90 2714 3170 0 2.98 Overall Busteroids Card and bus Low Res SVGA Overall Herc. Stingray Pro (ARK) PCI 1Mb P100 46.98 41.01 43.99 Hercules Dynamite Power 2MB VLB DX2/66 41.18 44.37 42.77 Diamond Stealth Pro 2Mb (928) VLB DX/50 27.39 48.85 38.12 ET4000/W32p (2Mb) VLB DX2/66 33.65 33.33 33.49 Diamond Stealth 32 2MB VLB DX2/66 33.05 33.33 33.19 Cirrus Logic 5434 2Mb VLB SX/40 31.62 34.73 33.18 Mercury X1/VL 2Mb (S3-805i) VLB DX2/80 32.33 32.22 32.28 Cirrus Logic 5434 2Mb VLB SX/33 28.85 30.09 29.47 Genoa Phantom 64 2M (S3-864) PCI P90 35.26 20.58 27.92 Genoa Phantom 64 2M (S3-864) VLB DX2/66 35.15 18.81 26.98 D. Stealth 64 DRAM (Trio64) PCI P90 31.78 18.68 25.23 Diamond Stealth 64 DRAM PCI P90 31.48 18.81 25.15 Diamond Stealth 64 VRAM 2Mb VLB DX2/66 26.56 23.07 24.82 Spea Mirage P64 (S3-864) 2Mb PCI P100 31.65 17.03 24.34 ATI Mach32 2Mb VLB DX2/66 24.93 21.29 23.11 Diamond Stealth 24 (S3-805) VLB 18.59 27.52 23.05 Diamond Viper PCI 2Mb (Oak VGA) P100 6.95 37.26 22.11 Diamond Stealth 64 DRAM 1Mb PCI P90 25.88 13.43 19.65 Cirrus Logic 5434 1Mb PCI P90 (1) 17.90 16.29 17.09 Cirrus Logic 5426 VLB SX/33 18.96 14.58 16.77 S3-805 VLB DX2/66 21.93 10.33 16.13 LightSpeed W32p (1Mb) PCI DX2/66 15.97 14.80 15.38 Cirrus Logic 5428 VLB DX2/66 15.58 10.97 13.27 Orchid Fahrenheit 1280+ 1Mb VLB DX2/66 13.69 10.18 11.93 Trident 9200Cxr 1Mb VLB SX/25 10.17 9.12 9.64 ET4000 ISA DX/33 9.03 5.89 7.46 Diamond SpeedStar Pro ISA DX/40 8.67 6.22 7.45 Number 9 Imagine 128 PCI P60 5.38 3.69 4.54 ET4000 ISA 5.34 3.14 4.24 Diamond Viper SE PCI P90 4.61 2.98 3.80 Trident 8900 ISA 4.33 2.98 3.65 Incomplete results (320x200x256 only): 16-bit 32-bit Number 9 GXE 64 Pro PCI P90 18492 22260 ATI Expression PCI P90 11062 16752 (SVGA modes crash) Diamond Stealth 32 PCI P90 10051 15156 (1) Burst-mode disabled?The 320x200x256 mode has most relevance for DOS games, 640x480x256 is becoming increasingly popular. The 360x480 VGA mode score has relevance for games that use 'Mode X'. The 640x480x16M mode result is interesting for windows-video type applications. The 16-bit 320x200x256 score corresponds to '3dbench' on a given system (ignoring its large CPU dependency).