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Hello,i want to ask which is best cpu Thanks

Intel® Core(TM) i7-840QM Processor (1.86 GHz, 8 MB L3 cache) 

Intel® Core(TM) i7-720QM Processor (1.60 GHz, 6 MB L3 cache) 

Intel® Core(TM) i7-620M Processor (2.66 GHz, 4 MB L3 cache) 

Intel® Core(TM) i5-520M Processor (2.40 GHz, 3 MB L3 cache) 
              
AND DOWN ARE LITTLE SLOWER BUT I WANT TO KNOW FOR ALL 

Intel® Dual Core(TM) (1.7 GHz, 2 MB L2 cache) 

Intel® Dual Core(TM) (2.8 GHz, 1 MB L2 cache)

Zohaib R · Answer

Hi traktori,

Of your choices, Intel® Core(TM) i7-840QM Processor (1.86 GHz, 8 MB L3 cache), is the best processor because this is a Quad Core Processor with 8 MB L3 cache.

For more details you can refer to the Intel Website (https://www.intel.com/content/www/us/en/homepage.html Below is link for details on Intel® Core(TM) i7-840QM Processor:

https://ark.intel.com/content/www/us/en/ark/products/43125/intel-core-i7-840qm-processor-8m-cache-1-86-ghz.html?wapkw=i7-840qm

Please revert for clarification.

Zohaib R · Answer

Hi traktori,

CPU cache is used to reduce the average time to access memory. When the processor needs to read from or write to a location in main memory, it first checks whether a copy of that data is in the cache. If so, the processor immediately reads from or writes to the cache, which is much faster than reading from or writing to main memory.

Most modern CPUs have at least three independent caches: 

1.	Instruction cache is used to speed up executable instruction fetch.
2.	Data cache to speed up data fetch and store.
3.	Translation lookaside buffer (TLB) used to speed up virtual-to-physical address translation for both executable instructions and data. 

The data cache is usually organized as a hierarchy of more cache levels (L1, L2, etc.). you can read more about the cache from the below link:

https://en.wikipedia.org/wiki/CPU_cache

More the size of the cache better will be the performance.

Please revert for clarification.

Zohaib R · Answer

Hi traktori,

I checked a few popular processors in core 2 duo processor family. I tried matching the processor speeds you have mentioned and also the L2 cache. I could not find processor which you have mentioned. I would request you to reply with processor name such as E8235, P9700, etc. this will help me compare the two processors effectively. You can check the list below:

1.	Intel Core 2 Duo E8235 	2.8 GHz 	6 MB L2 Cache
2.	Intel Core 2 Duo P9700 	2.8 GHz 	6 MB L2 Cache
3.	Intel Core 2 Duo T9600 (Socket P) 	2.8 GHz 	6 MB L2 Cache
4.	Intel Core 2 Duo T9600 (BGA) 	2.8 GHz 	6 MB L2 Cache
5.	Intel Core 2 Duo Mobile T5450	1.66 GHz	2MB L2 Cache
6.	Intel Core 2 Duo Mobile T5500	1.66 GHz	2MB L2 Cache

Please do write back to us.

Zohaib R · Answer

Hi traktori,

Thank you for replying. I have looked at the factsheet of both the processors. Intel® Core(TM)2 Duo Processor - T5450 is a better processor because it has two Cores in it while Intel® Pentium® 4 Processor 521 has single core in it. Multiple cores can run multiple instructions at the same time, increasing overall speed for programs. Also T5450 has a 2 MB L2 Cache. A processor operating with 2 cores and 2 MB L2 cache is better than the one with only 1 MB L2 Cache.

For details you can refer to the following links:

https://ark.intel.com/content/www/us/en/ark/products/30787/intel-core-2-duo-processor-t5450-2m-cache-1-66-ghz-667-mhz-fsb.html

https://ark.intel.com/content/www/us/en/ark/products/27461/intel-pentium-4-processor-521-supporting-ht-technology-1m-cache-2-80-ghz-800-mhz-fsb.html

Please reply if you have any further questions.

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