Originally Posted by Wizziwig
Interesting. Does the active DP-HDMI adapter also pass audio while sending full-range RGB? Including HD surround audio?
I wonder if the iGPU is really sending full-range or if it's being expanded by the "active" adapter. Depends on what "active" actually means.
Originally Posted by renethx
With a $25 GPU, you can't do even Lanczos upscaling for video contents.
Even a crappy $25 ATI 6450 would have performance on par with an iGPU and allow full HDMI format control.
- Active adapter includes a DP-HDMI converter chip. The DP port sends DP signals and the chip converts them to TMDS (i.e. HDMI) signals.
- Passive adapter simply tells the DP port to send TMDS signals. DP with a passive adapter is identical with HDMI.
Yes, an active adapter supports audio. But it looks like audio formats supported depends on the chip inside the adapter. The adapter I have supports DD, DTS, multichannel LPCM, but does not support TrueHD or DTS-HD. It does not support HDMI 1.4a 3D video format either. Well, DP supports TrueHD / DTS-HD in theory, but as there is no AVR supporting DP, we always have to use an active adapter so that we never know what's the limiting factor.
DP supports various color spaces according to the specs, but primarily full-range RGB.Limitation of HD 6450
. It could do Lanczos scaling implemented in, e.g. ffdshow, under EVR, but shader units are scanty.
HD 6450: 200 GFLOPS
HD 6570: 624 GFLOPS
HD 7770: 1280 GFLOPS
GT 610/520: 156 GFLOPS
GT 430: 269 GFLOPS
GT 640: 691 GFLOPS
GTX 650: 813 GFLOPS
GTX 650 Ti: 1421 GFLOPS
Intel HD Graphics 4600: 432 GFLOPS (Well, DXVA2 with Intel's own scaling algorithms is preferred, so FLOPS does not matter in this case.)