PCDVD數位科技討論區 - 另外請問BIOS裡的AGP Aperture size

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另外請問BIOS裡的AGP Aperture size

請問BIOS裡的AGP Aperture size一般要設多少?是看顯示卡的記憶體容量嗎?如64mb就設64mb~128mb就設128mb~謝謝!

有大大說設主記憶體一半,那我顯示卡128MB就要設64MB嗎?

據說影響不大...我開預設值

設定和系統計憶體一樣的大小.如有128m就設128m.如有512m就設512m.若計憶體512m.選項只有到256m.就選256m.

引用:

Originally posted by 9045
設定和系統計憶體一樣的大小.如有128m就設128m.如有512m就設512m.若計憶體512m.選項只有到256m.就選256m.

設定和系統計憶體一樣的大小????
系統記憶體有1G以上的呢??

引用:

Originally posted by xacx
設定和系統計憶體一樣的大小????
系統記憶體有1G以上的呢??

我看過版子這選項可以開超過1G的...
不過重點這選項似乎對當今的遊戲起不了什麼作用吧?
我只知道Omegacorner網頁裡面的參考表NV卡是設128,不過這好像是搭配她所修改過Driver的建議,不過我也是設128..

我試過
但是效能差異不大...
有能可以完全解釋他的功用嗎...謝謝

簡單的說，就是假如顯示卡記憶體不夠用
可以把一部分的主記憶體讓顯示卡使用
這選項就是設定你願意分出來多少給顯示卡用
但是即使是 AGP8X ，頻寬也遠不及顯示卡記憶卡到顯示卡晶片的頻寬
所以當用到這功能時，代表效率會變很差
在那時候，你通常會換記憶體更大的顯示卡
所以我覺得設多少沒什麼差

引用:

Originally posted by 熱帶氣旋
我試過
但是效能差異不大...
有能可以完全解釋他的功用嗎...謝謝

我剛剛問google大大，他說：
http://www.google.com/search?ie=UTF...P+Aperture+size

建議看這篇：
http://www.ocfaq.com/article.php/ov...king/vidcard/43
http://www.cybercpu.net/howto/basic...ure_2/index.asp

FutureMark的字典好像也蠻好用的
http://www.futuremark.com/community...abulary/?page=1

引用:

AGP Memory (AGP Aperture)
A feature of all AGP specifications. An AGP graphics adapter can use part of the system memory to store data and/or directly render from. Once it has been set by the operating system, the amount of memory allocated to the use of AGP memory is then dynamic and changes as according to use by the graphics adapter and application using it. The maximum size of memory that can be "sidelined" is determined by the AGP Aperture value in the motherboard BIOS.

So why not just use the normal system memory? Pages that are allocated to AGP memory cannot be paged to the hard drive (swapped into the virtual memory/swap file) and the addresses for each page are stored in a table that can be accessed very easily by the Northbridge chip. All of this helps to increase the performance of read/writes of data stored in the AGP memory.

The graphics adapter can access the contents of the AGP memory by several methods:
DMA (Direct Memory Access): the graphics adapter is not permitted to render directly from the AGP memory but it can take data from it as and when it needs to. This is currently the standard mode used as virtually all graphics cards have sufficient local memory to store the data it needs.
DIME (Direct Memory Execute): the graphics adapter must always render directly from the AGP memory in this mode. Considering that using the local memory is far faster than the AGP memory for rendering, this is only used with onboard graphics adapters that are forced (by design) to use system memory instead of having their own local memory.
DIMEL (Direct Memory Execute and Local): the graphics adapter can be made to render from either the local or AGP memory. The idea behind this mode is that data that is not going to be needed very often can be left in the AGP memory, whereas frequently accessed data is kept in the local memory. In reality, it is limited in use as graphics cards today can read/write data across the local memory bus so much faster than across the AGP bus that the AGP memory becomes a hindrance rather than a performance aid.
For a particular mode to be used, both the graphics adapter and system (operating system, Northbridge, etc) must support it.