DVI-D is an older interface, normally what you'll find is DVI-I which works fine with VGA to DVI adapters. Additionally, if the card is including adapters, likely an indicator of the adapters working (Sapphire wouldn't sell you extras that won't work with the main product, wastes their money). One thing on using DVI to VGA adapters, ensure they are attached firmly before you attach the monitor, if they wiggle around it can actually bend their plugs (and cause various distortion on the screen).
Also, as it sounds like you wanna do multi-monitor with this X1950, remember to download HydraVision from ATI (www.ati.com) if it isn't included on the CD, it'll give you better driver-side support for multiple displays.
I have just ordered new parts for a computer, which has not yet arrived, including a Sapphire Radeon X1950PRO 512MB DDR3 and two monitors with only VGA input. The graphics card has dual DVI output and i was hoping to just use two converters (DVI - VGA) to connect the screens. I have now, however, just read that some DVI outputs called DVI-D do not support these adapters and cannot be used on VGA monitors. Please tell me if this graphics card will work with them or not! I can't seem to find if it does or not on the aria.co.uk website. It only says:
Digital video standard: Digital Visual Interface (DVI)