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</div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_146381"> <P ><FONT color=#000000><B>[决定显卡性能的因素]</B> 现在已经不仅是游戏玩家才在意自己电脑的显卡怎么样，普通的电脑用户在配置电脑的时候也对显卡有了特别要求，而面对市面上纷繁复杂的显卡，了解显卡的性能也就成了一件不简单的事。显卡的性能是由不少因素而决定的，首先我们来了解一下显卡的简单工作原理。 <DIV align=center><IMG src="http://hardware.mydrivers.com/pages/images/20040430214634_55029.jpg" border=0></DIV> 1、 从总线 (bus) 进入显卡芯片 ——将 CPU 送来的数据送到显卡芯片（GPU）里面进行处理。 2、 从 video chipset 进入 video RAM——将芯片处理完的数据送到显存。 3、 从显存进入 Digital Analog Converter (RAMDAC=数字模拟转换器)，由<a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>显存读取出数据再送到 RAMDAC 进行数据转换的工作。（显卡现在大都已将RAMDAC集成在了显示芯片内） 4、 从 DAC 进入显示器 (Monitor)——将转换完的类比数据送到显示屏。 <DIV align=center><IMG src="http://hardware.mydrivers.com/pages/images/20040430214711_51744.jpg" border=0></DIV> 可以看到，决定显卡的性能的首要是显卡的GPU，也就是显卡的显示核心，比如NVIDIA的GeForce FX 5900和ATI的Radeon 9800等，这都是我们熟悉的GPU名称，可以说GPU的性能直接决定了显卡的性能。 <DIV align=center><IMG src="http://hardware.mydrivers.com/pages/images/20040430214755_61042.jpg" border=0></DIV> 其次就是显存的带宽，要保证GPU的性能得到充分的发挥就需要足够大的带宽，就像一辆法拉利，一定要在赛道上才能发挥它的威力，如果跑在乡间的土路上，我想连拖拉机都跑不过！ 再次是显存的容量等等其他的因素。高分辨率的应用以及大量3D场景的渲染，需要用到大显存，因此当显存容量不足的时候，系统会自动调用内存作显存使用，然而在速度上内存当然是无法和显存相比的了，这样显卡的性能自然也就受到影响。 这些因素都是依据<a href="http://theory.oecr.com" target="_blank" class="relatedlink">理论</a>得来的，显卡GPU这方面相信大家都没有什么异议，什么档次的GPU基本上就决定了这款显卡在实际应用中会有怎么样的性能，而且在购买时GPU已经是显卡的第一标志，厂商也无法在上面动什么手脚。但对于显存的位宽及容量，这些隐性的指标，就成了左右显卡性能在实际使用中的关键因素了！ 这是我们这次<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>所使用的一个最新的Athlon64平台，我们将在这个平台上测试显存的位宽及容量对显卡性能的影响。 <DIV align=center><IMG src="http://hardware.mydrivers.com/pages/images/20040430214838_21612.jpg" border=0></DIV> 驱动程序都使用了NVIDIA和ATI官方最新发布的驱动（在我们截稿前，NVIDIA官方已经发布了最新的ForceWare驱动56.64版）。测试<a href="http://opticaldesign.oecr.com" target="_blank" class="relatedlink">软件</a>除了权威的三款显卡基准测试软件——3DMark2001 SE、3DMark03 Build 340和AquaMark 3外，还使用了两款最新的游戏DEMO——UT2004 DEMO和FarCry的第二版DEMO。这两款游戏都是今年众人期待的年度大作，其中FarCry是一款全面支持DirectX 9的游戏。 </FONT></td></tr></table> </div> <div id="comment_146381" class="cm"> </div> <div id="post_rate_div_146381"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=19982&formhash=7ad26927" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('favoritenumber').innerHTML + ' 人收藏'" title="收藏本帖"><i><img src="static/image/common/fav.gif" alt="收藏" />收藏<span id="favoritenumber" style="display:none">0</span></i></a> <a class="followp" href="home.php?mod=spacecp&ac=follow&op=relay&tid=19982&from=forum" onclick="showWindow('relaythread', this.href, 'get', 0);" title="转播求扩散"><i><img src="static/image/common/rt.png" alt="转播" />转播</i></a> <a class="sharep" href="home.php?mod=spacecp&ac=share&type=thread&id=19982" 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<em id="authorposton146382">发表于 2004-5-7 10:53:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=19982&page=1&authorid=7493" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_146382"> <P><FONT color=#ff0000>镭9550变镭9600详解</FONT></P><P 18px"><FONT color=#000000><B>引子</B> 故事发生在公元2004年，天下大变，江湖两大帮派A派和N派为了争夺武林盟主之位，展开了激烈的争夺大战。故事全因A派一个异类而起，它本乃江湖新秀，家传绝技，不料竟又自创一派，一时间功力大增，加上其神秘的出身，很快便成为江湖上一颗璀璨四射的新星。 <DIV align=center><img src="http://news.mydrivers.com/pages/images/20040331111544_84916.jpg"></DIV><P> <B>[天下局势 疑云窦起]</B> “不是我不明白，是这个世界变化太快”。新年伊始，蓄谋以久的NV便率先向ATI发难，钟对中低端市场这一兵家向来必争之重地先后发布了MX4000、GFX5500、GFX5700LE三款显卡，引发了两大IT大鳄之间的新一轮“抢滩登陆战”。 仔细研究NV的产品发布策略，便让人深感其“无所不用其极”。2003年度曾有媒体专门对NV的产品发布策略做过总结，认为其说细化的产品线迎合了不同的市场定位，因此赢得了比Ati更大的市场份额。而这一点也被认为是Ati在产品发布策略上的失误。于是在2003年的最后一季度大量的SE、XT、Ultra、Pro、黄金版、白金版显卡如雨后春笋大量涌现在市场上。让人眼花瞭乱之余，倒不知究竟该选购什么样的显卡了。 有经验的DIY行家即可看出，这些显卡的差别主要体现在显存的频率、带宽以及板卡的用料和做工上。频率上不同版本之间差距越来越小，带宽由128位缩减为64位，PCB板由八层变为6层甚至4 层等等。厂家随便一衍变，便是一个新版本的出现。举个例子： </P><DIV align=center><img src="http://hardware.mydrivers.com/pages/images/20040428144857_97608.jpg"></DIV><P> 低端卡频率越来越往250和400上靠，难道这个频率上就是厂家即能保证成本、利润又能保证性能的黄金分割点吗？难道消费者的每一分钱从此将由每一兆赫兹来算计？Ati面对NV的宣战表现的较为低调，仅仅推出了一款9550来应战。9550的一上市便被披上一层神秘的面纱。Ati在发布之初对于9550的宣传异常保密更为史无前例的是9550的驱动程序是单独发布的，最新的催化剂4.4版也不支持这一“异类”。一些鼻息敏感的消费者立刻闻到了一些异样。 </P><DIV align=center><img src="http://hardware.mydrivers.com/pages/images/20040428145456_44156.jpg"></DIV><P> 从技术指标上看R9550的核心依然采用了与R9600完全相同的RV350核心，采用FC-PGA封装，0.13微米制造工艺。因此在特效支持上，Radeon 9550保留了如Smartshader2.0技术，Smoothvsion2.1技术，HyperZ III+显存优化技术等众多先进技术。只是在核心频率方面有所降低，由325MHz下降到250MHz；显存频率则与标准版本的R9600一模一样。也就是说9550只是由9600的降频版，那么换任何人都可能起疑，我们是否可以通过超频来达到与9600一样的性能呢？ </FONT></P></td></tr></table> </div> <div id="comment_146382" class="cm"> </div> <div id="post_rate_div_146382"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr 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