Quote:
Originally Posted by Asmodian
I did a madVR performance test on my Titan with Jinc3+AR/Jinc3+AR, smooth motion on, debanding low/low, ordered dithering. 4 frame rendering buffer, 1 present queue, windowed mode (new path), Windows 8.1. SLI Off.
1080p24 -> 3840x2160@60Hz, 17.5ms
While playing Nvidia Inspector says:
GPU 41-52%
MCU 10-14%
GPU CLK 549-679 MHz
RAM 1429MB
Assuming performance is directly proportional to shaders*MHz a stock GTX650Ti has 39% of the GPU performance of a Titan @ 679 MHz. It also has 28% of the memory bandwidth of my Titan, well above the 14% I used.
This works out to at worst a 25.9ms rendering time on a GTX650Ti at 90% GPU usage; fine for 30fps or lower but not 60fps (16.6ms).
If I use Bicubic75+AR for chroma scaling and Jinc3 for image it changes to a 15.6 ms rendering time with at most 44% GPU usage. Scaling to a 19.5ms rendering time on a GTX650Ti @ 928MHz and 90% usage. Still not enough for 60 fps but plenty of headroom for 30 fps (33.3ms).
These are worst case estimates though, I wouldn't be surprised if the GTX650Ti had the GPU power for Jinc3 Image and Bicubic75 chroma for 1080p60. Sadly the memory bandwidth is probably insufficient.
Memory usage is a major issue though; if I turn the buffers down to 4 rending and 1 present I still hit 1429MB of GPU memory used and 4/1 is the minimum.
Edit: I was able to get memory usage down to 958MB with Jinc3+AR chroma and Jinc3+AR image by turning on most of the trade quality for performance options (10 bit instead of 16 bit) and turning off debanding and smooth motion.
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Speaking of rendering times, how do I know what to aim for? My refresh rate is 60 hz. Where did 16.6 ms come from?