Originally Posted by Fudoh
I think the current Oppo generation of BD players will upscale to 4K if you feed a signal through the HDMI input those machines provide. Uses the Marvell QDEO for upscaling.
If I'm not mistaken, OPPO players use the Sigma chip for scaling. The QDEO chip is only used for picture enhancements, such as DNR, sharpening, color adjustment, etc.