P0914SY備件就億佳
顯卡是插在主板上的擴展槽里的（一般是PCI-E插槽，此前還有AGP、PCI、ISA等插槽）。它主要負責把主機向顯示器發(fā)出的顯示信號轉化為一般電氣信號，使得顯示器能明白個人計算機在讓它做什么。顯卡主要由顯卡主板、顯示芯片、顯示存儲器、散熱器（散熱片、風扇）等部分組成。顯卡的主要芯片叫“顯示芯片”（Video chipset，也叫GPU或VPU，圖形處理器或視覺處理器），是顯卡的主要處理單元。顯卡上也有和計算機存儲器相似的存儲器，稱為“顯示存儲器”，簡稱顯存。 [2]
早期的顯卡只是單純意義的顯卡，只起到信號轉換的作用；我們一般使用的顯卡都帶有3D畫面運算和圖形加速功能，所以也叫做“圖形加速卡”或“3D加速卡”。PC上早的顯卡是IBM在1981年推出的5150個人計算機上所搭載的MDA和CGA兩款2D加速卡。 
顯卡通常由總線接口、PCB板、顯示芯片、顯存、RAMDAC、VGA BIOS、VGA功能插針、D-sub插座及其他外圍組件構成，顯卡大多還具有VGA、DVI顯示器接口或者HDMI接口及S-Video端子和Display Port接口。
配置核芯顯卡的CPU通常價格不高，同時低端核顯難以勝任大型游戲。集成顯卡是將顯示芯片、顯存及其相關電路都集成在主板上，與其融為一體的元件；集成顯卡的顯示芯片有單獨的，但大部分都集成在主板的北橋芯片中；一些主板集成的顯卡也在主板上單獨安裝了顯存，但其容量較小。集成顯卡的顯示效果與處理性能相對較弱，不能對顯卡進行硬件升級，但可以通過CMOS調節(jié)頻率或刷入新BIOS文件實現(xiàn)軟件升級來挖掘顯示芯片的潛能。集成顯卡的優(yōu)點是功耗低、發(fā)熱量小，部分集成顯卡的性能已經(jīng)可以媲美入門級的獨立顯卡，所以很多喜歡自己動手組裝計算機的人不用花費額外的資金來購買獨立顯卡，便能得到自己滿意的性能。 
集成顯卡的缺點是性能相對略低，且固化在主板或CPU上，本身無法更換，如果換，就只能換主板。 
獨立顯卡
獨立顯卡是指將顯示芯片、顯存及其相關電路單獨做在一塊電路板上，自成一體而作為一塊獨立的板卡存在，它需占用主板的擴展插槽(ISA、 PCI、AGP或PCI-E)。獨立顯卡的優(yōu)點是單獨安裝有顯存，一般不占用系統(tǒng)內存，在技術上也較集成顯卡得多，但性能肯定不差于集成顯卡，容易進行顯卡的硬件升級。獨立顯卡的缺點是系統(tǒng)功耗有所加大，發(fā)熱量也較大，需額外花費購買顯卡的資金，同時(特別是對筆記本電腦)占用更多空間。由于顯卡性能的不同對于顯卡要求也不一樣，獨立顯卡實際分為兩類，一類專門為游戲設計的顯卡，一類則是用于繪圖和3D渲染的顯卡。

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