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標題: CPU 點分? [打印本頁]

作者: ken0429ng 時間: 2009-8-19 09:52 PM 標題: CPU 點分?

本帖最後由 ken0429ng 於 2009-8-20 04:12 AM 編輯

我想知CPU 點分咩係個係快D 邊個係慢呀?

作者: 我係遊客 時間: 2009-8-20 02:03 AM

本帖最後由我係遊客於 2009-8-20 07:21 PM 編輯

CPU 定 CUP?

吓~~~問下人地有冇問錯問題都算灌水???
唔係提佢改返CPU(本帖最後由 ken0429ng 於 2009-8-20 04:12 AM 編輯) 其他人都唔知佢問咩啦邊可能答佢呀

作者: ken0429ng 時間: 2009-8-20 04:13 AM

CPU..

作者: Low_B 時間: 2009-8-20 11:18 AM

CPU speed is not a reliable indicator of CPU performance.
Many factors inside and outside of the CPU exert a significant impact on CPU performance, and on overall system performance.

The CPU
CPU speed is measure in megahertz. A 1MHz CPU can accomplish one million CPU cycles in one second.
Does this mean that a 2MHz CPU is twice as fast as a 1Mhz CPU?
Not necessarily. This depends on how much work each CPU accomplishes in each clock cycle.
The 1MHz CPU might very well be faster, in practice, than the 2Mhz CPU - if it is more efficient or can process more tasks in each CPU cycle.

The Cache
The purpose of a cache is to enable the CPU to access recently used information very quickly.
A cache will significantly affect CPU performance.
However, caches also represent some difficulties in simple comparison.
Some caches are bigger than others. A typical L1 cache is 256Kb and a typical L2 cache is 1MB.
Generally speaking, the larger the cache, the better the system performance boost. However, this is not always the case.
A cache operates at a certain speed, just like the core of the CPU. Some caches operate at the full speed of the CPU, while others operate at half that speed or less.
A small cache which operates at full speed may be much more useful than a cache which is twice as large but operates at only half the speed of the CPU.
Even comparing cache sizes can be difficult. Some CPU's utilize inclusive caches. In a CPU with an exclusive cache, the data stored in the L1 cache is often duplicated in the L2 cache. Only CPUs which employ exclusive caches will have the full capacity of their L2 caches available.

The Front Side Bus
The Front Side Bus (FSB) is the connection between the CPU and system memory.
The Front Side Bus operates at a speed which is a percentage of the CPU clock speed.
The faster the speed at which the Front Side Bus allows data transfer, the better the performance of the CPU.

System Memory
RAM has an access speed. Faster RAM will mean the CPU has to wait less often for data. This will, effectively, make the CPU faster

作者: dragn 時間: 2009-8-20 01:16 PM

CPU speed is not a reliable indicator of CPU performance.
Many factors inside and outside of the CPU exert a significant impact on CPU performance, and on overall system performance.

The CPU
C ...
Low_B 發表於 2009-8-20 11:18 AM

thanks for share
very useful especially the cache part

作者: ivan04 時間: 2009-9-28 08:55 PM

快慢係睇你
1@l2 /l3 /l1 (cache)有幾大!
2@fsb幾多!
幾多核心!
其次可以上網搵下隻cpu 既benchmark !
而且仲要睇返你底版粒chip夠唔夠快!

作者: ivan04 時間: 2009-9-28 08:56 PM

for eg:
q9400 4核:1666fsb l2:6mb 2.66hz
e5300 2核:1mb l2 800fsb

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