2009年3月14日 星期六

netbook, 網域名稱伺服器(Free DNS)

消費型超低電壓(CULV)平台

Netbook,是重量不到1公斤,
顯示螢幕在7吋至10吋之間,
擁有5~8小時工作電池壽命,
寬頻無線上網能力。
更重要的是其價格是在199美元至599美元之間。

3G wireless 7.2 Mbps的HSPA

GoDaddy 是全世界相當知名的網域名稱註冊商,
同時也提供虛擬主機(Hosting)、電子郵件(Email)、SSL Certificates 等等服務。
不管你的網域名稱是不是在 GoDaddy 註冊,都可以使用 GoDaddy 提供的免費網域名稱伺服器(Free DNS)。
只要透過一個步驟註冊為 GoDaddy 免費會員,就能讓你的網域名稱使用 GoDaddy 的 DNS 解析服務啦!

除了可以免去自己架設 DNS 的煩惱,也可使用 GoDaddy 功能強大的 DNS 解析服務,
包含A紀錄、CNAME別名紀錄、MX郵件紀錄、TXT紀錄、SRV紀錄、AAAA和NS紀錄,
同時也可以匯入/匯出原有的網域名稱設定,相當好用。

廣達旗下達智的WiMAX Netbook、
友訊的路由器與USB、
米迪亞的WiMAX MID(可攜式上網裝置)、
華碩的WiMAX Eee PC與筆電、智邦的室內基地台、
威盛與英業達合作的WiMAX Netbook。

藍光光碟(Blu-ray Disc;BD)採用405奈米波長的藍光雷射來進行讀取因而得名,
DVD採用的是650奈米的紅光、
CD的雷射光則是780奈米的波長。
一張 BD的容量達25GB,採用單面雙層的碟片容量則高達50GB。
BD與DVD最大的不同就在於高容量與高位元傳輸率,
使得BD的得以儲存HD(High Definition)高畫質影像。

When it comes to buying PC components, the single most important one is the processor (CPU). For this reason, i feel it fair to dispell some of the beliefs that some people have with regard to dual core processors, which is not helped by some unscrupulous sellers who only add fuel to this misconception.

When AMD and Intel advertise their multi core processors, whether it be
an AMD Athlon 64 X2, AMD Phenom,
Intel Core i7, Intel Core 2 Duo / Quad or Intel Pentium D,
they always show the speed of each core individually. For example,
a Core 2 Duo E8400 is a 3ghz per core processor (also written as 3ghz x2).
What they do NOT say is that this is a 6ghz processor, and for good reason.
Dual core processors do NOT run in such a way that their two cores combine together to run a single application at the speed of both cores added together.
In terms of sheer clock speed alone
(Note: This is not how you should judge how good a processor is),
the fastest dual core is the Pentium D 960, which runs at 3.6ghz/core (3.6ghz x2) but at no time at all does it ever run at 7.2ghz, yet there are still ebay sellers who are selling dual core CPU's or PC's with dual core processors installed, and describe them as running at anything between 5.2ghz to 7.2ghz. Once again, in terms of sheer clock speed alone,
the fastest processor was the Pentium 4 670, a single core processor, which ran at 3.8ghz. Neither Intel nor AMD have ever released a processor with a clock speed faster than 3.8ghz without being overclocked. Anyone stating they are selling a processor or PC which is running faster than 3.8ghz are either overclocking their processor (which means your warranty with the manufacturers of all your PC's internal components are void) or are misleading you.

This is not saying dual core processors are not worth buying, far from it, but they work in a specific way. If we take the Core 2 Duo E8400 as an example again, you can have the CPU using one core for your main task (which will be running at 3ghz) while the second core will be running your background tasks, such as anti-virus program, which will also be running at 3ghz. This is much more efficient than having a single core processor having to run everything by itself, which would result in the PC running slower than it would if you were using a dual core processor. Another way of using the dual core CPU is if you are using programs or games that are specifically written to use the dual core processor in a way that allows it to use one core to run one part of the program, while the other core runs another part. This is called a "multi-threaded" program.

The usefulness of a dual-core CPU is not in dispute, they are fast becoming invaluable as even basic programs such as CD burning software are becoming more complexed in their structure and being programmed to take advantage of 2 or more CPU cores. With the price of dual core CPU's dropping fast, there's really no reason to choose a single core CPU over dual core. But, be sure about what you are buying and don't think you are going to be getting something running 5ghz or faster.

*UPDATE* This misleading advertising is still going strong, and with the advent of quad core CPU's, it is, if anything, getting worse. There are now sellers listing Intel quad core CPU's and adding all 4 cores together.
With the fastest quad core processor:the Intel Core i7 Extreme 965, which has 4 cores running at 3.2ghz each, they are describing it as a 12.8ghz CPU.... which is absolutely ludicrous.

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