Re: Starting Cocoa development - Developing for Jaguar
Re: Starting Cocoa development - Developing for Jaguar
- Subject: Re: Starting Cocoa development - Developing for Jaguar
- From: Allan Odgaard <email@hidden>
- Date: Mon, 8 Jul 2002 20:40:52 +0200
On mandag, juli 8, 2002, at 08:18 , Finlay Dobbie wrote:
3. I have a G4-400 with 2 gigs of RAM and the original 16 meg video
card.
This machine should be OK? Any advantage of upgrading to a ATI RADEON
8500?
Hardware acceleration?
Upgrading to a faster video card will obviously give you better
graphics performance [...]
You'd think so, but that's not the case for the current version of Mac
OS X. Since all rendering happens in main memory, and is then copied to
the graphics card, then the bus is the bottleneck (can handle less than
200 MB on my system compared to my gfx card which have a bandwidth of
about 2 GB/s). Main memory operate at about 300 MB/s on my system, so
clearing an 800x600 rectangle takes at least 150 micro seconds, or about
one frame, no matter how fast your graphics card is :-(
Funny thing is, the Apple developer documentation mentions how
framebuffer swapping is obsolete with the advances in modern hard and
software, because the blitter is so fast... a shame they don't use it...
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