2008-7-28 15:33
热火人
最强显卡Radeon HD 4870 X2游戏性能全面测试
AMD针对Radeon HD 4800系列显卡采取了非常奇怪的NDA保密政策：第一轮只允许公布测试成绩，但不许透露架构细节资料，要到产品正式发布才可以无所不谈。Radeon HD 4850如此，Radeon HD 4870 X2也是如此。
本月中旬已经有部分媒体公布了自己的4870 X2预览性测试文章，但根据AMD的规定，只能测试四个项目，而且没有功耗测试(因为PowerPlay尚未开启)，让人在感慨AMD新旗舰强大的同时也不免有些遗憾。
今天，德国PCGHX.com放出了一份相当完整的测试，向我们展示了4870 X2在3DMark06、3DMark Vantage和五款3D游戏里的性能表现，包括《虚幻竞技场3》、《狂野西部》、《Crysis》、《极品飞车：卡本峡谷》和《上古卷轴4：湮没》。
既然不能讨论内部架构，那我们只好先看看一些外部情况了。我们知道，代号R700的4870 X2是在一块27厘米长的PCB板上集成了两颗RV770XT核心，并通过PLX桥接芯片相连，与上代3870 X2类似。不同的是，桥接芯片已经升级，型号“[b]PEX86BB-AA50BC F[/b]”，支持[b]PCI-E 2.0[/b]，因此能大大提高互连带宽，不会形成瓶颈。
[b]PLX桥接芯片的功耗不到1W[/b]，普通硅脂就能对付，但两颗RV770XT核心放在一起就是耗电大户了，为此[b]AMD特意将散热器与GPU核心接触的部分由铝升级为铜，整个庞大散热器的体重也达到了1080克，也就是两斤多沉。[/b]
4870 X2样品的频率与4870相同，也是核心750MHz、显存3600MHz，不过[b]GDDR5显存颗粒并非来自奇梦达，而是海力士[/b]，编号“[b]H5GQ1H24MJR-T0C[/b]”，传输速度4Gbps，[b]正反各8颗[/b][b]共计16颗[/b]，[b]总容量2GB[/b]，每颗GPU核心使用其中的一半。
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测试平台主要配置：
处理器：Intel Core 2 Duo E8500 OC 3.6GHz (400MHz×9)
主板：ASUS P5N-D (nForce 750i SLI)
内存：2×2GB DDR2-800 5-5-5-15
操作系统：Windows Vista SP1 x64
驱动程序：GeForce 177.34 WHQL、Catalyst 8.5/8.6/8.7
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从测试成绩看，[b]4870 X2在3DMark系列里得分遥遥领先[/b]，无论3870 X2还是GTX 280、9800 GX2都被远远甩开；游戏性能方面，[b]《狂野西部》和《上古卷轴4：湮没》都是轻松大幅胜出[/b]，[b]《Crysis》DX9表现很好但DX10有待改进[/b](还不如4850)，[b]《虚幻竞技场3》没有对比N卡但比4870、4850、3870都要好得多[/b]，[b]《极品飞车：卡本峡谷》在4X FSAA下表现很一般但在8X FSAA下好一些[/b]。
由于现在3D游戏的优化问题，4870 X2在不同游戏里表现差别很大，因此就特别依赖催化剂驱动的继续完善。可能是还没有发售的缘故，本月的催化剂8.7没有提供对4870 X2的正式支持，不过相信下个月的催化剂8.8会重点针对该卡进行强化，游戏性能也应当会有所提高。
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[align=left]至于功耗，这种双芯架构产品难免会高很多，再加上PowerPlay节能技术仍未开启，[b]系统待机功耗就有275W[/b]，远超8800 Ultra的195W和GTX 280的155W，[b]满载更是高达420W[/b]，而8800 Ultra和GTX 280分别为285W和310W。[/align]