http://www.best3dgraphiccard.com/video-card-dual/
Video Card Dual
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PNY nVidia GeForce 8400 GS 512 MB PCI Video Graphics Card VCG84512SPEB - Retail List Price: $74.99 Sale Price: $43.50 Average Rating:   |
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Upgrade your PC with the almost universal Verto 8400GS PCI for amazing performance with support for the PCI bus. 
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EVGA 01G-P3-N945-LR GeForce 9400 GT 1GB DDR2 PCI-E 2.0 Graphics Card List Price: $81.99 Sale Price: $57.84 Average Rating:  |
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The features of the 9400 GT 01G-P3-N945-LR include the GeForce 9400 GT(550MHz clock) chipset, 1GB of 128-bit DDR2 memory with a 400 MHz clock with an effective rate of 800 MHz, 1400MHz Shader Clock, 16 processing cores, PCI Express 2... |
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EVGA 512-P2-N738-LR GeForce 8400 GS 512MB DDR2 PCI-Express Graphics Card List Price: $50.99 Sale Price: $32.95 Average Rating:  |
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The eVGA 512-P2-N738-LR NVIDIA e-GeForce 8400GS 512 MB PCI-E Graphics Card features 512 MB of 128 bit DDR2 memory with a 4.26 GB-per-second memory bandwidth. Based on NVIDIA unified architecture with GigaThread technology, the card offers full Microsoft DirectX 10 Shader Model 4... |
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ASUS Radeon EAH4350 512MB DDR2 PCI-Express Silent Graphics Card List Price: $51.99 Sale Price: $29.99 Average Rating: |
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ASUS EAH4350 SILENT/DI/512MD2(LP) Radeon HD 4350 512MB 64-bit DDR2 PCI Express 2.0 x16 Low Profile Video Card (DVI /─ /2nd VGA /HDMI /─ /HDTV Support) Hybrid CrossFire Ready |
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EVGA nVidia GeForce 7200GS 512 MB VGA/DVI/TV-out PCI-Express Video Card 512-P2-N430-LR List Price: $49.99 Sale Price: $29.04 Average Rating: |
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The features of the 7200 GS 512-P2-N430-LR include the GeForce 7200 GS (450 MHz clock) chipset, 512MB of 64-bit 2.5ns GDDR2 memory with a 532 MHz effective rate, PCI Express compatibility,4.26GB per second memory bandwidth, CineFx 3... |
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PNY 6200 512 MB AGP DVI Graphics Card VCG62512APB List Price: $44.99 Sale Price: $40.00 Average Rating:  |
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GEFORCE 6200 AGP 512MB 64BIT CTLRVGA DVI HDTV/SDTV |
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EVGA 512-A8-N403-LR GeForce 6200 LE 512MB DDR2 AGP Graphics Card List Price: $66.99 Sale Price: $41.99 Average Rating: |
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The features of the 6200 LE 512-A8-N403-LR include the GeForce 6200 LE (300MHz clock) chipset, 512MB of DDR2 memory with a 532MHz clock with an effective rate of 1064MHz, AGP 8X compatibility, Integrated NVIDIA TV encoder, 4... |
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PNY GeForce FX 5200 PCI 256 MB 2 Port VGA + S-Video Graphics Card VCGFX522PEB - Retail List Price: $56.99 Sale Price: $36.99 Average Rating: |
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Leave the dull world of integrated graphics technology behind and enter the World of Cinematic Computing. The NVIDIA GeForce FX-Series graphics cards deliver industry-leading features and performance enabling special effects on par with Hollywood films... |
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 Nvidia Quadro4 980XGL AGP Dual DVI 128 Video Card  US $10.50
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 Nvidia P169 Quadro4 NVS280 PCI Dual VGA 64 Video Card US $4.99
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 3 Nvidia Quadro4 200NVS AGP Dual Monitor 64 Video Card US $4.99
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 $100 Value Nvidia Quadro FX 1100 128 MB Dual Video Card US $14.99
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 Nvidia Quadro FX1300 128MB PCI E Video Card Dual DVI US $19.95
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 Matrox Epica 64MB Dual PCI Video Card EPI TC2P64LPAF US $95.00
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 MATROX MILLENIUM G450 AGP 32MB DUAL VIDEO CARD US $19.99
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 NVIDIA QUADRO FX VIDEO CARD MODEL P128 Dual DVI AGP US $9.99
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 Quadro NVS 290 256MB Dual DVI PCIe Video Card US $9.99
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2 GB single video card vs. 512 MB dual video cards?
I'm in need of better graphics processing and i need to know if a single video card with 2gb of video memory is better than dual video cards with 512 mb each.
Here are the video cards I'm referring to:
Single 2GB GDDR5 ATI® Radeon® HD 4870 X2
Dual 512MB NVIDIA® GeForce® 9800 GT
thanks for the help 
always get the single best card you can afford. It will save you headaches in the end...whether from flakey sli/crossfire drivers or the overall cost of buying 2 cards just to watch something else come out 2 days later that will smoke them. The 4870X2 is a beast...it outperforms 2 9800gt's.