我一個用8800GTX的哥們很喜歡這個優(yōu)化，因為這能讓他或者更高的幀數(shù)而很少甚至沒有畫面質(zhì)量的損失

　　So now lets say all our desired settings ingame @ 800x600, use 650Mb. Ok. But say were now using a 1GB card so it says 650/1024Mb. This is a problem now because if we force -height 1080 -width 1920. We will end up with our ingame options changing to 1920x1080 giving us way more slowdowns because R* starts using that dam scaling reflection maps.etc with resolution.

　　好的，現(xiàn)在看看游戲里面的顯示，我們在游戲中設(shè)置的各種選項在800X600的分辨率下一共需要650M顯存。但是如果你使用一個1GB顯存的顯卡，游戲中會顯示650/1024MB。這里有一個問題，因為如果我們在commandline.txt中強(qiáng)制-height 1080 -width 1920，我們最終會發(fā)現(xiàn)游戲中的分辨率變成了1920x1080，這使游戲變得很慢。因為

　　R*使用了那個該死的檢測程序。(這里說的意思就是說 如果顯存有剩余 那么在游戲中的低分辨率會被R*的檢測程序強(qiáng)制提高從而使用更高的陰影貼圖)

　　So what we need to do now is limit the memory GTAIV sees to exactly the amount to run our game in 800x600 (or whatever quality refection maps.etc you want) with our desired settings.

　　所以現(xiàn)在我們要做的是把游戲中的可用顯存精確的調(diào)整到游戲需要的一樣。

　　So lets go back to our dilemma, we have a 1GB graphic card and the game only takes up 650mb with the settings we want in 800x600.

　　我們有1GB顯存的顯卡但是游戲中我們的設(shè)置只需要650Mb

　　We can figure this out by doing some simple math.

　　1GB Card (650mb desired settings): 650/1024 = 0.635 (its 0.634 but give a tiny bit extra, just like a couple megabytes).

　　我們可以做一些簡單的數(shù)學(xué)計算來解決這個問題

　　1GB 顯卡(設(shè)置需要650M): 650/1024 = 0.635 (實(shí)際上是0.634 但是超過了一小點(diǎn)).

　　So you would use -availablevidmem 0.635 that would make the game detect you only have 650mb ram which barely fits the features you want in 800x600.

　　所以你可以使用-availablevidmem 0.635 命令 這是的游戲檢測你的顯存容量只有650M 而這恰恰滿足游戲中設(shè)置的需要

　　So now once we have figured that out your commandline.txt or your shortcut appending should look like this (depending on what resolution you want/your vidmem.etc):

　　所以現(xiàn)在我們可以看見你的commandline.txt 或者快捷方式命令行應(yīng)該是下面這樣(取決于你想要的分辨率/你的顯卡容量)

　　-height 1080 -width 1920 -availablevidmem 0.65

　　-height 1080 -width 1920 -availablevidmem 0.65

　　and maybe you add stuff like (-framelimit, or -noblank or whatever).

　　你可以可以加入一些其他命令如(-framelimit, 或者 -noblank 或者其他任何你想要的).

　　*BUT DO NOT USE ANY UN-RESTRICTION (this includes the nomemrestrict and norestrictions or anything like that)!

　　*但是不要使用任何解除限制的命令(包括-nomemrestrict，-norestrictions或者類似的命令)

　　4. Now when we start up our game. We will be in our desired resolution, and when we look in the game options it will say 800x600, even though we are in a way higher resolution and all your settings will be how you want them and your memory budget will be exactly the right amount or similar like 650/650 or 742/746.etc

　　4. 現(xiàn)在當(dāng)我們開始游戲，我們的游戲?qū)⑦\(yùn)行在我們設(shè)置的分辨率(指命令行中設(shè)置的)，同時當(dāng)我們打開游戲選項的時候發(fā)現(xiàn)游戲中顯示為800x600，即使 這樣，我們還是使用了一個更高的分辨率，已經(jīng)所有你想要的顯示設(shè)置，而你的顯存預(yù)算精確的吻合游戲的需求 比如650/650 或者 742/746等等。

　　Funny thing here you wont be able to go back cuz it will detect your memory budget is to low and the game is forcing a higher res, so you might not be able to leave the options screen now, so alt tab, and close the game. If all your settings looked right and it said 800x600 but was clearly in a higher res. Then you did everything right, if not, go retry.

　　有趣的是 你無法退出選項菜單了。因為游戲檢測出你的顯存容量太低了 而游戲需要更多的資源，所以你無法離開選項菜單。ALT+TAB,然后關(guān)掉游戲。如果你所作的看起來正確，游戲中顯示為800x600卻明顯的是一個更高的分辨率，那么你做對了。如果不是這樣，請再試一次。

　　5. Now restart the game and play. Yay, good fps, cheated GTAIV to not up the reflection quality with the resolution.

　　5. 現(xiàn)在重啟游戲，然后玩吧。很棒，非常好的FPS，騙過了GTAIV，使他不會隨著分辨率的上升而提高陰影質(zhì)量。

　　Additional Speed: If you happen to be running Vista x86/x64 and you have a directx10 capable graphic card. Do what elecg2 figured out. I tried creating empty/easy HLSL shaders and putting them in GTAIV to get rid of shadows and stuff but that didn't work.

　　額外的提速： 如果你的操作系統(tǒng)是32位/64位 VISTA 而你的顯卡優(yōu)勢DX10顯卡的話。按照elecg2 發(fā)現(xiàn)的辦法去做。我試著創(chuàng)建了無/簡單的陰影，然后把它們放進(jìn)了游戲中去替換原來的，結(jié)果沒用。。