Re: [Mplayerxp-general] mplayerxp vs mplayer
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From: <mr...@us...> - 2002-11-28 21:08:04
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Nick Kurshev <nic...@ma...> writes: > > Dual-ported means that the memory has doubled address and data lines. > > It can be read/written from two controllers simultaneously. Standard > > SDRAM has only one read/write port, so you have to wait for anyone wh= o > > might be using the bus before accessing it. > >=20 > Well, I couldn't find out any english resources but according on > http://athena.vvsu.ru/glax/video/video_ram.htm SGRAM (Synchronous > Graphics RAM) - is full ananlog of SDRAM but supports blocked and > masked writing. SGRAM is single-port memory but 2 memory pages > simultanesously that emulates dual-porting of other memory types. > SDRAM is successor of EDO RAM. Any other operation after first > reading or writing is occurs with zero delays that achieves the > maximal performance of reading/writing. VRAM is real dual-port > memory which provides access to memory from side of two different > devices but not for the same cell of memory. WRAM is VRAM + ~25% of > performance. (Is used in Matrox and Number Nine cards) >=20 > Dunno what's timings are used in WRAM but according on SPD of my > home SDRAM - there are no delays within of memory row (1Mbit length) > if program performs continious reading/writing. That is all correct, AFAIK. > That's theory! Practice shows us that video card can have any kind > of memory but when cpu spends its resources to overcome AGP barrier > it always will be slower than case when such job is performed by > GPU! (Hope that's clear! ;) I'll have to believe you. I don't have a Radeon. --=20 M=E5ns Rullg=E5rd mr...@us... |