minimum graphics score for fulll hd video?

[jodonow]

what is the (comfortable) minimum graphics score (2D I assume?) necessary to play fluidly full hd (1080p) video (30fps I suppose)

[David (PassMark)]

There is no simple answer. It depends on the CPU, the GPU, the sound format on the video, the video format & compression of the video. Some CPUs also have hardware acceleration especially for video.

I would think that any card with a 3DMark > 150 should be reasonably safe.
http://www.videocardbenchmark.net/gpu_list.php