Originally Posted by JMGNYC
My only concern with the 7750 is that I've read it won't do SD Video (60fps) with madVR without dropping frames.
That's true. First let's look at the madVR levels (my own, of course):MadVR Levels
- BL = Bilinear
- BC = Bicubic
- AR = anti-ringing filter
- LL = scaling in linear light
Level 2 is the current default setting. Level 4 will give you the best PQ
(a lot better than Level 3 in a larger display). The PQ difference between Level 4 and Level 5 is very little (or sometimes Level 5 is worth because of more ringing), but Level 5 requires lot more GPU processing power. So you can safely ignore it. Recently madVR introduced "DXVA2" image up/downscaling. If you select this, madVR will use the driver's own algorithm for image up/downscaling and chroma upscaling as well. If there is no image scaling, madVR will use an arbitrary chroma upscaling algorithm you selected in the madVR settings.DXVA2 Scaling Algorithms
Simple tests show that
where HD = 1280x720, FHD = Full HD = 1920x1080, ES = edge sharpening filter, S = sharpening filter. AMD's DXVA2 algorithms are the most primitive one, Blinear, for all three. NVIDIA image upscaling algorithm differs depending on the source content's resolutions: for SD, it's Lanczos with some edge sharpening filter; for HD and full HD contents, it's Bilinear with with some edge sharpening filter. AMD's and NVIDIA's Chroma Bilinear upscaling is slightly different from madVR's.
Intel's are the best among the three. Chroma upscaling is close to Bicubic 50, image upscaling is Lanczos+AR, image downscaling is a bit difficult to identify, it looks more like Catmull-Rom+AR+unsharp mask than Catmull-Rom+AR+LL. If you are going to use Intel HD Graphics (in any SNB / IVB desktop CPU), madVR DXVA2 is the best choice
. When there is no image scaling (mainly full HD contents in a full HD display), you have to choose an chroma upscaling algorithm and it depends on the number of EUs (Execution Units). I recommend
- Intel HD Graphics 4000: Bicubic 75+AR
- The others: Bicubic 75Average rendering time in HD (1366x768) and Full HD (1920x1080) displays
Rendering time must be < 1/24 ~ 41 ms for films and < 1/60 ~ 16 ms for videos for smooth playback.
F = film
V = video
i = interlaced
p = progressive
All films are progressive (DVD and BD). Video can be interlaced (NTSC broadcast and DVD) or progressive (recent videos). HD 7750 is good for all films except for 4K UHD films at madVR Level 4. HD 7770 (roughly 1.5 times better than HD 7750) is good for all sources except for 4K UHD videos at madVR Level 4.Average rendering time in 4K UHD (3840x2160) and 8K UHD (7680x4320) displays
You will need HD 7970 to play back all source formats at madVR Level 4 in a 4K UHD display.
BTW Intel HD Graphics 4000 can play back all source formats (including 4K UHD films/videos) at madVR DXVA2 (roughly equivalent to madVR Level 3) in HD/FHD displays. Unfortunately it has a couple of problems such as non-support for full RGB output and imprecise 23Hz. AMD A10-5800K is a better choice for madVR Level 3.