小核心 大升级,AMD全新7nm RDNA架构发布,RX 5700系列显卡带来了什么?

在5月27日的台北电脑展上,AMD公布了7nm工艺的全新Radeon RX 5700系列显卡。不过当时没有披露更多细节,AMD显然准备把惊喜留在稍后举行的AMD Next Horizon Gaming Tech Day活动上公布。零镜网受邀参加了此次AMD Tech Day活动,并为大家带来第一手的详细内容。

美国洛杉矶当地时间6月8日下午, AMD总裁兼首席执行官苏姿丰博士(Dr. Lisa Su)在主题演讲中正式发布了代号为“Navi”的Radeon RX 5700系列显卡。新显卡基于全新的7nm RDNA架构,拥有全新的设计、更快的频率以及更低的功耗。

对于AMD显卡工程研发团队来说,RDNA架构是其专注于GPU研发的最新成果,也是在GCN架构六年打磨、迭代五次之后的一次颠覆性创新。RDNA架构的Navi核心相比于上一代的Vega核心同频性能提升25%、能耗比提升50%,实际性能相比于RTX 2070高出约10%。

之前有传言说RDNA架构是基于GCN架构的修改,不过从今天AMD显卡工程研发团队公布的细节来看,这显然是不对的,RDNA架构采用了全新的计算单元、多级缓存结构以及简化的图形流水线,只是在指令集方面对GCN架构实现了向下兼容。

通过改进后,RDNA架构相比GCN架构,每时钟性能提升了25%,每瓦性能提升了50%。另外,RDNA架构还原生支持PCIe 4.0接口,设在消费级GPU架构当中还属首次。

在性能架构升级的同时,Navi GPU的核心面积只有251平方毫米,相比于上代大核Radeon RX Vega 64的495平方毫米,NAVI GPU核心面积缩小了49.3%,和当年火爆的Radeon HD 4870 RV770核心尺寸相差无几。与其对应的,英伟达GeForce RTX 2070所用的TU106核心面积达到了445平方毫米,英伟达GeForce GTX 1660系列的TU116核心面积为284平方毫米。更小的面积,意味着更灵活的市场策略,我们新的Navi GPU有机会成为一代经典。

具体到实际产品,AMD此次一共带来了Radeon RX 5700 XT和Radeon RX 5700两款显卡。AMD Radeon RX 5700 XT定位和英伟达GeForce RTX 2070接近,拥有40组计算单元,2560个流处理器,计算能力达到了9.75TFLOPs,同时其还拥有8GB GDDR6显存,1605MHz的Base频率,1755MHz的Game频率以及最高1905MHz的Boost频率。

Radeon RX 5700的定位类似于英伟达GeForce RTX 2060,其计算单元少了4组,拥有2304个流处理器,计算能力为7.95TFLOPs,显存保持一致,但是核心频率略有降低。

目前发布的公版显卡Radeon RX 5700 XT采用铝合金散热盖板,在边缘有一个凹陷设计,有助于提高产品辨识度。散热片底部采用均热板设计,使用了更有效导热的材料,拥有8pin+6pin以及7相数字供电设计,有助于显卡的进一步超频。

目前AMD公布了部分对比测试,和英伟达GeForce RTX 2070相比,Radeon RX 5700 XT在1440P分辨率下的游戏表现普遍占优,其中《战地5》的性能优势达到了22%,相当惊人。

目前AMD公布的Radeon RX 5700 XT官方定价为449美元,换算为人民币价格不到3200元;Radeon RX 5700官方定价为379美元,换算为人民币价格不到2700元。从AMD公布的定价和产品规格来看,Radeon RX 5700 XT和Radeon RX 5700两款显卡将成为核心游戏玩家的全新选择。

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