微星最近在AM5主板上加入了内存高性能模式，说是对SK海力士A-die颗粒的专属优化，实际上就是对内存小参动手了，通过优化这些小参让内存达到更高的传输速度以及更低的延迟，该模式支持的平台包括了X670、B650和A620主板。

想开启这模式首先得去微星官网下载对应型号的最新BIOS，然后开启EXPO或AXMP，接着在BIOS超频选项中开启High Efficiency mode后，在其中Memory Timing Preset选项的四个等级里选一个，最高档的是Tightest，但未必可以成功。

我们拿了手头上两块微星的AM5主板来尝试过这一功能，一块是MEG X670E ACE，另一块是MAG B650M MORTAR WIFI，用的是锐龙9 7950X处理器，两款主板均成功开启，但Tightest模式是挑内存的，未必所有内存都能开启这一档，而Tighter则基本没啥问题。

我们以MEG X670 ACE搭配七彩虹战斧·赤焰DDR5 6000MHz内存为例，记录了各个模式下的时序小参：

预览var tableid = settableid(); document.write(''); Table().init({ title: "各模式下时序对比", header: ["模式","Tightest","Tighter","Balace","Relax","Auto","EXPO"], width: '92%', columnWidth: 'MAX', //表格单元宽度，"MAX"最大内容显示，""AVG"平均，"AUTO"自动，指定[15,16,20] id: tableid, data: [ ["主时序",], ["tCL","30","30","30","30","30","30"], ["tRCD","36","36","36","36","36","36"], ["tRP","36","36","36","36","36","36"], ["tRAS","76","76","76","76","76","76"], ["tRCD","116","116","116","116","116","116"], ["tRW","60","60","60","60","90","90"], ["tRFC1","380","550","884","884","884","884"], ["tRFC2","480","480","480","480","480","480"], ["tRFCSB","390","390","390","390","390","390"], ["tREFI","65535","65535","65535","65535","11677","11677"], ["副时序",], ["tRTP","12","12","12","12","23","23"], ["tRRDL","8","8","8","8","15","15"], ["tRRDS","4","4","4","4","8","8"], ["tFAW","28","28","28","32","32","32"], ["tWTRL","28","28","28","30","30","30"], ["tWTRS","5","5","5","8","8","8"], ["Turn Around时序",], ["tRDRDSCL","8","8","8","8","8","8"], ["tRDRDSC","1","1","1","1","1","1"], ["tRDRDSD","8","8","8","8","8","8"], ["tRDRDDD","8","8","8","8","8","8"], ["tWRWRSCL","23","23","23","23","23","23"], ["tWRWRSC","1","1","1","1","1","1"], ["tWRWRSD","15","15","15","15","15","15"], ["tWRWRDD","15","15","15","15","15","15"], ["tWRRD","8","8","8","8","8","8"], ["tRDWR","20","20","20","20","19","20"] ] });前面五个主时序是不会变的，因为这些都是写死在EXPO的预设里面，有变化的是主时序后面那些以及副时序，Turn Around时序变化不明显 ，这里用的七彩虹这套内存Auto档和直接开EXPO基本没啥区别，但另一套测试过的芝奇焰光戟Auto档则和Balace一样，所以它真的是会跟随内存不同自动变化的。

接下来我们看看各个模式下内存带宽与延迟的变化：

预览var title_text = "AIDA 64内存与缓存测试"; // 标题文字 var subtitle_text = "www.expreview.com "; // 副标题文字 var unit_text = "MB/s "; //单位 var leftside = "8%"; //左边空白 var topside = 50; //每组间距 var mblur = 0.05; //模糊效果 var bgopacity = 0; //背景透明度，0为全透明 var mysort = 0; //是否排序 var myper = 1; //是否显示百分比 var mylengend = true; //是否显示图例 var toplegend = 50; //图例上端空白 var labelcolor = '#fff'; // 标签文字颜色 var legendwidth = '90%'; //图例宽度 var titlecolor = '#222'; //标题文字颜色 var barheight = 35; //柱高度,当为7倍数时，不显示刻度线 var bargap = 3; //柱间距,相当于百分值，即2% var xaxismax = null; //指定X轴最大值，null时为自动 var autocolor = 1; //是否自动判断颜色，0为否，1根据品牌生成颜色 ，如果 >1 则为AMD NV Intel 标准色, var mycolor = []; //自动生成随机颜色 也可ANIColor("NVIDIA",3)可以生成三种NV绿，可替换成AMD Intel //var mycolor = ANIColor('AMD',4); //这样自动生成4种AMD红色，其它如NVIDIA、Intel同理 //var mycolor=['#953f61', '#72355f', '#d77169']; //自定义颜色 AMD红 '#9F1417', NV绿 '#82B41B', Intel蓝 '#0075C5', //var mycolor = ['#0dcc47', '#969696', '#6f7b80','5A94DF']; var data_arr =[ {"type":"内存读取","EXPO":"76843","AUTO":"76737","Relax":"84433","Balace":"84483","Tighter":"84712","Tightest":"84917"}, {"type":"内存写入","EXPO":"78339","AUTO":"77197","Relax":"87257","Balace":"88851","Tighter":"87271","Tightest":"89271"}, {"type":"内存复制","EXPO":"70458","AUTO":"70400","Relax":"77292","Balace":"77659","Tighter":"77650","Tightest":"78107"}, {"type":"内存延迟","EXPO":"65.1","AUTO":"65.7","Relax":"59.9","Balace":"59.3","Tighter":"59.5","Tightest":"56.4"} ]; TDInit(title_text, subtitle_text, unit_text, leftside, topside, mblur, bgopacity, mysort, myper, mylengend, toplegend, labelcolor, legendwidth, titlecolor, barheight, bargap, mycolor, data_arr, autocolor, xaxismax);测试的这套内存用Auto档和EXPO没啥区别，不过从 最低的Relax开始变化就很明显了，内存读取从7600MB/s提升到84000MB/s，内存写入从78000MB/s提升到87000~89000MB/s，内存复制从70000MB/s提升至77000~78000MB/s，基本上带宽提升了10%。

内存延迟也有明显变化，只开启EXPO时是65ns，而Relax、Balace、Tighter这三档则是59ns，最高级的Tightest则是56ns，延迟减少了接近14%，可见 这个内存高性能模式作用还是很明显的。

微星这个内存高性能模式其实对于那些不是A-die的内存也能用，只不过对A-die内存的效果会明显一点，内置的四挡性能最好的是Tightest，然后以此是Tighter、Balace、Relax，开启的时候建议直接从最高档开始尝试，如果失败的话就一档档降下去，兼容性的排序是与性能反过来的。

其实微星的这个内存高性能模式确实蛮使用的，内存性能能直接提升个10%，对于广大玩家来说是一个福利，不知道能不能进一步推广到Intel平台上。

近日，技嘉推出了B650M K主板，目前已经在新蛋上架，价格同样为124.99美元。B650M K和B650M-HDV/M.2一样也是Micro-ATX规格，采用了8+1+1相供电其提供了四条DDR5内存插槽，可支持AMD EXPO和英特尔XMP内存模块；配有一条PCIe 4.0全长插槽，为x16模式，另外还有一条PCIe 3.0 x1插槽；提供了两个PCIe 4.0 M.2插槽，均支持2280规格；支持2.5G以太网连接；提供了一个DisplayPort 1.4接口和一个HDMI 2.1接口。

此前AMD曾表示，会扩大B650系列主板产品线，以满足更广泛的价位需求，主板制造商也会尝试降低B650主板售价，以吸引消费者选购AM5平台。从近期华擎和技嘉的举动来看，B650主板的价格似乎真的在逐渐下调，加上接下来AMD将推出A620芯片组，将进一步降低AM5平台的构建成本。

B650M-HDV/M.2主板为Micro-ATX规格，采用了8+1+1相供电、50A Dr.MOS。其提供了两条DDR5内存插槽，支持最高DDR5-6400+规格，最大容量64GB，可支持AMD EXPO和英特尔XMP内存模块；配有两条PCIe 4.0全长插槽，分别为x16和x4模式，另外还有一条PCIe 4.0 x1插槽；提供了一个PCIe 5.0 M.2插槽和一个PCIe 4.0 M.2插槽，均支持2280规格，另外有四个SATA III接口；主板还有一个用于Wi-Fi和蓝牙模块的2230 M.2插槽，支持Wi-Fi 6/6E模块。

后置I/O方面，B650M-HDV/M.2配有一个USB 3.2 Gen1 Type-C接口、两个USB 3.2 Gen1 Type-A接口、四个USB 2.0接口、一个HDMI接口、一个DP 1.4接口、以及一个2.5Gbps网卡接口（Realtek RTL8125B），音频解决方案为Realtek ALC897，带有BIOS一键更新按钮。该款主板板载了一个USB 3.2 Gen2 接针、两个USB 3.2 Gen1接针和两个USB 2.0接头，另外一个Thunderbolt接针，支持华擎Thunderbolt 4 AIC卡，这意味着该款主板可以提供Thunderbolt 4接口。