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怎么选择一张好显卡?

2017-4-28 00:10| 投稿: caiflyer |来自: 互联网

摘要: 顶级显卡很容易辨认,它应该具有大量内存和速度很快的处理器。此外,与其他任何要安装到电脑机箱中的部件相比,它通常是最令人关注的。很多高性能显卡都声称需要或直接配备了外形夸张的风扇或散热器。但高端显卡提供 ...

顶级显卡很容易辨认,它应该具有大量内存和速度很快的处理器。此外,与其他任何要安装到电脑机箱中的部件相比,它通常是最令人关注的。很多高性能显卡都声称需要或直接配备了外形夸张的风扇或散热器。

但高端显卡提供的功能超出了大多数人的真实需要。对于主要使用电脑来收发电子邮件、从事文字处理或上网冲浪的用户来说,带有集成显卡的主板便能够提供所有必要的图形功能。对于大多数偶尔玩游戏的用户来说,中端显卡已经足以满足需要。只有游戏迷和那些需要完成大量三维图形工作的用户才需要高端显卡。

显卡性能的一个很好的整体衡量标准是它的帧速,它是以每秒的帧数(FPS)为单位加以衡量的。帧速说明了显卡每秒钟能显示多少幅完整的图像。人眼的处理能力约为每秒25帧,而动感快速的游戏至少需要60FPS的帧速才能提供平滑的动画和滚动。影响帧速的因素包括:

每秒生成的三角形数或顶点数三维图像是由三角形或多边形组成的。这项指标说明了GPU能够以多快的速度计算整个多边形或对该多边形进行定义的顶点。一般而言,它说明了显卡能以多快的速度生成线框图像。

像素填充速率:这项指标说明了GPU一秒钟内能处理多少个像素,从而也就说明了显卡能以多快的速度对图像进行光栅化处理。显卡的硬件对其速度具有直接影响。以下是对显卡速度影响最大的硬件性能指标及其衡量单位:

GPU时钟速度(MHz)

内存总线的容量(位)

可用内存的数量(MB)

内存时钟速率(MHz)

内存带宽(GB/s)

RAMDAC速度(MHz)

电脑的CPU和主板也对显卡速度有一定影响,因为非常快速的显卡并不能弥补主板在快速传输数据方面的能力的不足。同样,显卡与主板之间的连接以及它从CPU获取指令的速度都会影响其性能。

超频有些用户选择将自己显卡的时钟速度手动设置为更高的速率,以此来提高显卡的性能,这称为超频。人们通常选择对显卡的内存进行超频,因为对GPU进行超频可能会导致过热。而超频过于频繁的玩家,还是推荐用水冷进行散热。虽然超频可以获得更好的性能,但它也会使制造商的质保失效。

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