Here's the results of the test collated by video memory.
Observations:
1) GeForce 6600-68-- 256 meg look like the sweet spot for AH right no.
2) GeForce FX with 256 meg will probably not deliver the speed you thought.
3) It's worth tinkering with drivers and settings. You can get a big increase in fps. Radeons are especially sensitive to drivers.
4) I would shoot for 50 frames to play AH.
32 meg
P51d fwd 19 19 24 25 Video: GF2 MX400 AGP, Mem 32 MB
64 meg
P51d fwd 30 30 40 42 Video: GF2 Ti AGP, Mem 64 MB
P51d fwd 25 28 33 35 Video: GeForce2 GTS/GeForce2 Pro 64 meg
P51D Fwd 18 19 23 23 Graphic Card: NVIDIA GeFORCE3 TI 500
P51D Fwd 27 27 33 32 GFX Card: GeForce3 Ti200
P51d fwd 7 6 8 8 Video: GeForce4 MX 420 63.5 MB
P51d fwd 22 21 27 28 Video: GF4 MX440 AGP, Mem 64 MB
P51D Fwd 42 42 56 56 Card: GeForce4 mx440 64 mb
P51D Fwd 28 29 33 35 Graphic Card Nvidia GeForce MX/MX400 64mb
P51D Fwd 8 16 21 25 Chip type: RS200M AGP
128 meg
P51d fwd 28 28 28 28 Video: Nvidia MX 4000, Mem 128 MB
P51d fwd 33 34 38 41 Video: Nvidia MX 4000, Mem 128 MB
P51D Fwd 42 42 46 50 Graphic Card GeForce 4 TI4600 Card Memory 128mb.
P51D FWD 25 36 42 44 Graphic Card: GF4 Ti4600 Card Memory: 128 mb
P51d fwd 18 19 28 29 Video: GF FX 5200, Mem 128 MB
P51D Fwd 11 17 22 23 Video: G3Force FX 5900XT, Mem 128.0 MB
P51D FWD 42 43 60 64 Graphic Card: Gforce FX 5900 XT
P51D Fwd 42 44 53 54 Graphic Card: NVIDIA GeFORCE4 TI 4800 128MB
P51D Fwd 46 46 50 53 Video Card: FX 5900U 128MB
P51d fwd 43 44 56 62 Grahpic ATI 9600 XT AGP Mem 128 meg.
P51d fwd 54 58 72 71 Grahpic: ATI Radeon 9600 XT AGP, Mem: 128 MB
P51d fwd 38 40 48 55 Video: Radeon 9600XT Mem: 128meg
P51d fwd 24 16 32 33 Video: Radeon 9600
P51d fwd 38 42 53 56 Grahpic RADEON 9700 PRO AGP Mem 128 meg.
P51d fwd 45 45 58 60 Grahpic RADEON 9700 PRO AGP Mem 128 meg.
P51d fwd 46 47 59 60 Grahpic nVidia 6800 AGP Mem 128 meg.
P51d fwd 34 35 42 43 NVIDIA GeForce4 Ti 4800 128 MB
P51d fwd 45 46 65 68 Video: Radeon 9800 AGP, Mem 128 MB
P51D Fwd 54 37 46 47 Graphics: Radeon 9800 Pro AGP, Mem:128 MB
P51D Fwd 54 55 71 74 Graphics: Radeon 9800 Pro AGP, Mem:128 MB
P51D Fwd 40 51 63 67 Graphics: ati radeon 9800 AGP 128Mb
P51d fwd 35 36 45 48 Graphic ATI 9800 Pro AGP Mem 128 Mb
P51d fwd 51 51 74 79 Grahpic Radeon 9800 Pro AGP Mem 128 meg
P51D Fwd 36 40 49 50 graphic gard Radeon 9800 Pro 128mb
P51d fwd 26 51 61 62 Graphic: GeForce FX5200 AGP Mem: 128 meg
P51D Fwd 28 27 32 33 Graphic Card - NVidia GEForce FX5200 Card Memory - 128MB
P51d fwd 17 17 24 17 Video: ATI 8500 AGP, Mem 128MB
256 meg
P51d fwd 32 36 46 48 Grahpic Nvidia FX5200 AGP Mem 256 meg.
P51D Fwd 24 20 25 27 Graphic Card NVidia_5500 256
P51d fwd 32 32 33 33 Graphic NVIDIA GeForce FX 5600 AGP Mem 255 meg.
P51d fwd 34 34 36 36 Graphic NVIDIA GeForce FX 5600 AGP Mem 255 meg.
P51d fwd 19 22 24 28 Graphic Card Fx5700LE Mem 256
P51, Ful 45 51 67 71 Graphic Card: nVidia GeForce FX5900 Ultra
P51D Fwd 25 30 51 42 Graphic Card GeForce FX 5900 Ultra Card Memory 256.
P51d fwd 62 65 84 88 Video: GeForce 6600, Mem 256,0 MB
P51d fwd 52 53 72 75 Graphic GeForce 6600 PCI-E Mem 256 Mb
P51d fwd 62 65 79 81 Graphic GeForce 6800 Ultra PCI-E Mem 256 Mb
P51D Fwd 58 60 71 100 Graphic Card GF 6800 Card Memory 256 MB.
P51D fwd 72 80 99 102 Graphics Card - GeForce 6800 GT
P51D Fwd 44 46 55 58 Graphic Card GF 6800GT Card Memory 256 MB.
P51D Fwd 36 58 70 74 RADEON 9550 (Omega 2.6.53)
P51D Fwd 53 55 70 73 ATI RADEON 9600 Series AGP (0x4150)
P51D Fwd 39 57 57 57 Graphic Card: Mobility Radeon 9800 AGP laptop) 256MB
P51D Fwd 45 47 65 68 Graphic Card RADEON X800 Pro AGP Card Memory 256.
P51d fwd 86 84 108 114 ATI X800PRO agp 256 mb
P51D Fwd 57 57 72 76 Graphic: Radeon X800PRO AGP 256
P51D Fwd 59 59 63 63 Graphics: Radeon X800XL AGP, Mem:256 MB
P51d fwd 64 65 96 99 Grahpic ATI X800XL PCI-E Mem 256 MB
P51d fwd 59 60 87 90 Gpu: ATI Radeon X850XT, PCI Express, 256 Mb GDDR 3
P51D Fwd 61 60 78 81 Graphic: Radeon X850PRO PCI-E 256
