Aside from the processor, that seems to be the most asked question in various threads. Perhaps we can assemble the opinions/recs here?
NVIDIA dual DVI 1gb DD3 memory 128 bit/256 bit 2560 x 1600 resolution - HDMI bonus PNY XFX EVGA Inexpensive, best deal @ time of purchase [current offerings @ newegg] http://www.newegg.com/Product/Product.aspx?Item=N82E16814130792 http://www.newegg.com/Product/Product.aspx?Item=N82E16814130609 http://www.newegg.com/Product/Product.aspx?Item=N82E16814130612
This card is about 60$ and it runs 3 monitors. I don't currently use this card, read the reviews from verified owners on that site. http://www.newegg.com/Product/Product.aspx?Item=N82E16814102960
Nvidia Quadro NVS 295 or NVS 300. These are passively cooled (quiet) workstation graphics cards that support two 30" monitors @ 2560 x 1600 resolution. NVS 295 (256MB): http://www.nvidia.com/object/product_quadro_nvs_295_us.html $30 including shipping on ebay http://www.ebay.com/itm/Dell-NVIDIA...273?pt=PCC_Video_TV_Cards&hash=item2c675da4a9 NVS 300 (512MB): http://www.nvidia.com/object/product-nvs-300-us.html $41 including shipping on ebay http://www.ebay.com/itm/PNY-VCNVS30...356?pt=PCC_Video_TV_Cards&hash=item5895522ba4
Thought this might be a good thread to ask this: I have a new Dell with AMD Radeon HD 6450 1GB DDR3 video card - it will run 2 monitors. I need to run 4...is it easier/cheaper to add another card that will run 2 or replace this card with one that will run 4?
If you have the slots/space to run 2 cards then if you have a problem you still have a couple of monitors. The other issue would be how much each card draws energy wise relative to your power supply.
I've been using NVSs since 280... 295s for the last 5 years... 4-6 monitors. Perfect for multi-monitor trading.