Recently picked up a Dell GX280 that had a X300 Radeon 64mb card with DVI plug. Since I don't have an adapter, I took the card out and used the onboard video. Works fine, but I'm a little confused. The onboard video is listed as ATI 128 mb. The PCI-E card I took out is a 64 mb memory. Why would someone spend the money to put this in unless it was better than the onboard video? I'm sure there is something I don't know about allocation of system memory or something. Am I better off getting an adapter and using the Radeon card, or just stay with the onboard?