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旧 Feb 10th, 2007, 00:15     #1
老广
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默认 千万要买双核电脑

两年前我买了一个P4 2.66的电脑;最近买了一个所谓的双核CORE 2 DUO 1.8G的,发现速度比我两年前的p4快多了,真TMD的好用。

尽管是1.8G(其实有人可以超频到2.8G)。速度也比2.66的P4快。用优化大师的测试处理器得分比参考的3.0G的P4高。估计需要3.4G的P4才有这样的得分。但双核你就可以开虚拟机每个核用在一个系统,在刻录DVD同时浏览网页等等。

所以买电脑千万不要买单核的了。
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旧 Feb 10th, 2007, 01:01   只看该作者   #2
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默认

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两年前我买了一个P4 2.66的电脑;最近买了一个所谓的双核CORE 2 DUO 1.8G的,发现速度比我两年前的p4快多了,真TMD的...
比速度, CORE 2 DUO 肯定强, 自己买电脑还得要考虑这性价比吧!你这CORE 2 DUO 1.8G 差不多等于 3 个P4 3.4G的价格了。速度上又能有多少提高呢?

单任务下运算可能还不如我$100+ CPU(AMD Athlon 64 3500+). 说白了,目前这双核就是烧钱玩,双核等性价比再好些的时候考虑买比较明智。
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旧 Feb 10th, 2007, 07:06   只看该作者   #3
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默认

当相大多数常用软件按设计时考虑到应用双核CPU的特性时,买双核电脑才会感到明显快。
lz在用虚拟机时觉得快应该是有道理的。但目前很多情况下双核的优点发挥不出来。
个人看法同等价钱还是买单核更实惠。
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旧 Feb 10th, 2007, 11:21   只看该作者   #4
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默认

编软件要考虑如何利用双核CPU?感觉如何分配CPU不是应用程序要考虑的。多CPU系统靠操作系统来分配。多核的,我感觉是CPU自己分配用那个核。

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当相大多数常用软件按设计时考虑到应用双核CPU的特性时,买双核电脑才会感到明显快。
lz在用虚拟机时觉得快�...
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旧 Feb 10th, 2007, 12:20   只看该作者   #5
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默认

Inter双核CPU分配任务的在主板上,AMD分配任务集成在CPU内部。
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旧 Feb 10th, 2007, 13:10   只看该作者   #6
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默认

双核的很慢啊,AMD athlon64*2笔记本,1G内存,打开photoshop,就死机不动了。athlon 3800,512M都不会这样。觉得双核没广告上吹的那么好,反而退步了。
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旧 Feb 10th, 2007, 13:12   只看该作者   #7
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默认

我指的软件按设计时考虑到应用双核CPU的特性不是说程序设计时考虑怎么分配CPU。是指软件设计时要考虑利用算法的并行问题(或者说是充分利用多任务,多进程)。如果一个程序本身是单线程,用再多的CPU也没用。
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旧 Feb 10th, 2007, 13:15   只看该作者   #8
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作者: friend2k3 查看帖子
我指的软件按设计时考虑到应用双核CPU的特性不是说程序设计时考虑怎么分配CPU。是指软件设计时要考虑利用算法...
我理解你的话的意思是,其他软件要重新设计配合双核CPU,才能发挥双核的作用。不知道是不是这个意思。我觉得速度上是倒退了。
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旧 Feb 10th, 2007, 13:40   只看该作者   #9
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默认

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我理解你的话的意思是,其他软件要重新设计配合双核CPU,才能发挥双核的作用。不知道是不是这个意思。我觉得�...
还是您解释的通俗。
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旧 Feb 10th, 2007, 13:45   只看该作者   #10
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Inter双核CPU分配任务的在主板上,AMD分配任务集成在CPU内部。
那到底哪个实用(使用软件的时候)?太专业了,偶菜鸟看不懂的说。
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旧 Feb 10th, 2007, 13:47   只看该作者   #11
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还是您解释的通俗。
你已经说到点子上了,偶简单理解一下
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旧 Feb 10th, 2007, 16:31   只看该作者   #12
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默认

现在谁写程序还单线程,稍微大点的程序都是几十个线程。你用task manager自己看看。

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我指的软件按设计时考虑到应用双核CPU的特性不是说程序设计时考虑怎么分配CPU。是指软件设计时要考虑利用算法...
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旧 Feb 10th, 2007, 17:24   只看该作者   #13
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默认

你们都搞错了,core 2 due的双核并不是靠软件来分任务

它的封装和单核是一样的(775),指令读进去后自动load进两个cpu上,并不需要特殊的软件
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旧 Feb 10th, 2007, 17:58   只看该作者   #14
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默认

买不买core 2要考虑的因素:

core 2的FSB速度提高到了1066M,而p4只有800M,意味着内存存取速度提高了33%。内存存取速度的重要性,远大于指令执行速度。

core 2的两个core,是共享l2 cache的,指令数据读进l2 cache来,由两个cpu读取处理,比一个cpu处理效率高30-40%,这不需要任何软件支持。

所以1.8G的core 2,大概在速度上可以beat 3.2G的p4。

如果要买p4系统,一定要买兼容core 2的主板。因为intel马上要停产p4,将来买1066M FSB的core 2升级,你是无法在800M FSB的p4主版上发挥的,那就搞死自己了。

core 2现在唯一的缺点是贵,但它的耗电低,只有50W左右,典型的p4要130W,所以电费上你能捞回来的。
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旧 Feb 10th, 2007, 19:17   只看该作者   #15
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一个字:爽。
在虚拟机里的速度,不管是xp还是vista都跟实体的机没什么区别。

http://www.chinasmile.net/gallery/albums/userpics/52271/vxp.jpg
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旧 Feb 10th, 2007, 19:26   只看该作者   #16
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作者: gzkl 查看帖子
一个字:爽。
在虚拟机里的速度,不管是xp还是vista都跟实体的机没什么区别。

http://www.chinasmile.net/galle...
真的?羡慕中。。。

能在虚拟的系统里看视频么?
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旧 Feb 10th, 2007, 22:54   只看该作者   #17
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默认

我算了一下,5年可以省30块钱电费,所以还是不值。

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作者: b747lr 查看帖子
买不买core 2要考虑的因素:

core 2的FSB速度提高到了1066M,而p4只有800M,意味着内存存取速度提高了33%。内存存取...
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旧 Feb 10th, 2007, 23:18   只看该作者   #18
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默认

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作者: aaronding 查看帖子
现在谁写程序还单线程,稍微大点的程序都是几十个线程。你用task manager自己看看。
OOP和OOD必然是多线程的。但并不是用这种方式开发的软件就一定是并行的。
仔细想一下为什么gzk感觉core 2快,而其他有些人感觉反而慢。
他用的软件(或使用方式)发挥了core 2的功能。而感觉慢的人运行软件的环境即使用到了两个CPU,也是一个时间内只有一个CPU在运行,或者很多时间耗费在两个CPU之间的通讯上了。
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旧 Feb 10th, 2007, 23:21   只看该作者   #19
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默认

5年省30块钱电费,还是不值。

引用:
作者: b747lr 查看帖子
买不买core 2要考虑的因素:

core 2的FSB速度提高到了1066M,而p4只有800M,意味着内存存取速度提高了33%。内存存取...
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旧 Feb 11th, 2007, 00:54   只看该作者   #20
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默认 AMAZING

虚拟运行的xp启动就感觉非常快(从仿bios到出桌面仅10秒钟)。经过测速才知道cpu比实体xp还要快。但优化大师的测显卡3d性能是无法显示的,所以显卡慢。另外测出的cpu是完全不同的。
此外,虚拟装vista就觉的很快,可能少于半小时。因为以前装过实体的记得是要起码2个小时。

此帖于 Apr 29th, 2008 17:52 被 老广 编辑。
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