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谁有4x的开快写测一下速度啊?我觉得这个软件有问题吧,PCIE的也不会才11M吧????......天啊.........
cqhjackie 发表于 2009-11-8 22:08 ![]()
不奇怪的，这个是测试显卡接口带宽的回写效率（就是显卡反传数据到主板上），与驱动的关系比较大。以下是一些说明，俺英文好久没有碰了，看得半懂不懂的，各位凑合看看吧：
PURPOSE:
This benchmark was originally developed for internal testing at Serious Magic. We have released it publicly so that those who care about improving 3D graphics performance can see what we've observed. We believe it exposes a significant issue in PC graphics card performance. While today's graphics cards can render images very quickly, the software drivers are painfully slow at getting rendered output back over the AGP bus and into the PC where it could be saved and put to work by users. Current generation software drivers achieve only 1/100th of the theoretical download transfer speed that the hardware you've already paid for is capable of. It's remarkable that a graphics card with a video input and some video recorder software can record TV-quality images to the PC hard disk in real-time, yet the same card can't record it's own renderings at even 1/10th this speed.
The problem isn't the hardware, it appears to be the software drivers. This is supported by the fact that the external video input to a VIVO-enabled graphics card can be moved over the AGP bus very quickly. The speed of transfering the 3D rendered results of the same card is very, very slow. Yet it could be dramatically increased simply with revised software drivers. However, it appears that no manufacturer has yet made this aspect of driver peformance a priority. The first card manufacturer to address this performance issue would offer the following significant benefits to all the users of their hardware:
- Their graphics cards would become invaluable for rendering production output for TV, film and video. As things stand now, for typical video resolution images only about 5% of the time is spent on rendering. Why? Because today 95% of the time must be used just to transfer the rendered output back to the PC. This effectively nullifies the considerable advantages gained from the amazing speed of the graphics card hardware.
- Software could be written to allow users to actually record game output in real-time without much impact on game performance. After playing there would be a compressed movie of your game play saved on your HD. On a reasonably fast machine you could actually record your game output digitally via Firewire to your DV camcorder as you play or even compress and burn it to a Video CD or DVD at the same time you are actually playing.
- Screen capture software that grabs motion images of user interfaces for the purposes of tutorials and training is a vital business application. Yet these useful recording tools are currently limited by the graphics card software driver to transfering only a few full-screen frames a second. It should be simple to record 30 frame per second output to your hard drive but this is unfortunately not possible due to the texture download issue. The first card manufacturer to revise their software drivers to address the issue will have significant appeal among businesses, training and graphics professionals.
- Despite the popularity of Internet streaming, it is not currently possible to stream real-time rendered output from graphics cards over the Internet. The network connections, PC processors and codecs are all fast enough today. Sadly, all of this horsepower is being held back by one remaining weak link; the texture download speed of today's graphics card drivers.
BENCHMARK OPERATION:
In the first mode the benchmark renders and displays a simple image. In the second mode it renders, displays and downloads the same image to the PC. Downloading is required to use / save / stream any 3D output of the card (although this benchmark neither uses nor saves the images). The "T" key switches modes. The transfer rate and frame rate are displayed. We've intentionally kept the benchmark and the image rendered very simple (two planes sliding, one black, one white) to eliminate any variability in rendering speed (no slo-mo gunfights here, but the same results would apply). This serves to isolate the performance of the critical capability being measured by this benchmark, namely the incredibly long amount of time it now takes to actually lay your hands on the images your hyper-fast card rendered at such blinding speeds.
NOTE: Benchmark requires DirectX 8.0 or later. Because of this it will not run under WinNT. |
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IP卡
狗仔卡
发表于 2009-11-8 22:47
显身卡