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#1
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USB 2.0 Graphics Accelerator?
hi,
is it possible to build an external graphics accelerator connected to usb 2.0? i think about speeding up actual laptop 3d solutions... docmax -- |
#2
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USB 2.0 Graphics Accelerator?
Forget it! The 480 Mega Bits Per Second theoretical
bandwidth of a USB 2.0 port is just too limited to be useful for today's graphic applications. The AGP 8X has a (33MHz PCI x 4 bytes per bus width x 8) 1 Giga Bytes Per Second bandwidth. For example, if you want to draw a 1280x1024 frame (24-bit color plus 8-bit alpha) 75 times a second, you need to move around 400Mega Bytes a second to the frame buffer. And then, if you want to have any acceleration, you need to move extra texture maps, drawing primitives, direct X programs, etc. to your graphics card. Well, if you accept a 640x480x32 frame at 30Hz, the required bandwidth is around 40 Mega Bytes Per Second, or 300 Mega Bits Per Second, and the USB 2.0 bandwidth may barely suffix. My 2 cents. Stephen Wong @ Hong Kong On Thu, 18 Apr 2007, DocMAX wrote: hi, is it possible to build an external graphics accelerator connected to usb 2.0? i think about speeding up actual laptop 3d solutions... docmax |
#3
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USB 2.0 Graphics Accelerator?
It's possible to build an external graphics adapter connected to USB 2.0,
and there are several products on the market. These are used to connect multiple monitors for office productivity, not 3D. As Stephen pointed out, the 60 MB/s bandwidth of USB 2.0 is just too limiting. A Voodoo3-class accelerator may be able to survive with such limited bandwidth, but most laptop integrated video solutions are faster than Voodoo3s nowadays. -- "War is the continuation of politics by other means. It can therefore be said that politics is war without bloodshed while war is politics with bloodshed." "DocMAX" wrote in message ... hi, is it possible to build an external graphics accelerator connected to usb 2.0? i think about speeding up actual laptop 3d solutions... docmax -- |
#4
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USB 2.0 Graphics Accelerator?
"DocMAX" wrote in message ... hi, is it possible to build an external graphics accelerator connected to usb 2.0? i think about speeding up actual laptop 3d solutions... docmax -- possible, yeah prob would you wanna see how slow it ran? not really |
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