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cache question

post #1 of 12
Thread Starter 
whats it mean when i see on some chips and look at the cache for L1 cache it says 128kb + 128 kb and for L2 cache it says 2 X 128mb?
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post #2 of 12
What you are looking at are dual core cpu's. Where a single core cpu might have 64kb + 64kb of L1Cache with 512kb of L2Cache like this Opteron 144. A dual core for instance might have 128kb + 128kb of L1Cache and 2 x 1MB of L2Cache like this Opteron 165.
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post #3 of 12
Thread Starter 
thanks.
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post #4 of 12
Thread Starter 
i saw a processor that in the L1 cache it says 12KB+16KB and for L2 its 1mb which i understand but since its not dual core why is it 12 kb+ 16 kb instead of them just saying 28kb? Also how do you know how many processes a processor can do per second?
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post #5 of 12
Thread Starter 
sorry for another post but also whats nm stand for and what is it?
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post #6 of 12
nm = nanometer?
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post #7 of 12
Truthfully I am not certain why a processor has 12kb + 18kb and such. I have always assumed it was due to the processor having two instances of L1Cache on a single die. Someone correct me if I am assuming wrong.

What processors are you looking at in which you want to know how many processes it does per second. Core 2's do 12 calculations per cycle, Athlon 64's do 9 and Pentium 4's do 6. If you are looking at getting a new system and building from scratch look at the Core 2 Duo's as they are the best performer and best price to performance processor out there right now.
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post #8 of 12
Thread Starter 
how could you tell how many processes per second and what are nanometers?
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post #9 of 12
NM as far as im aware just means the lower it is. The less voltage it takes and so its more energy efficient. As far as im aware.

For example 120nm may take 1.7Vcore whilst 90NM takes 1.4 and so on.........

If you google it, you can find how many processes a second a cpu does. but like eupho said its:

'Core 2's do 12 calculations per cycle, Athlon 64's do 9 and Pentium 4's do 6.'
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post #10 of 12
There are two numbers for L1 cache because it is divided up into instruction cache and data cache. I'm not a huge pro at this but it goes something like this: All of the code used is part instruction and part code. For example, a typical line of code will have the first couple of bits/bytes be a x86 instruction to dictate what happens to the rest of the line of code - the data code. The two are split up because the instructions and data are usually separated. So, by splitting up the L1 cache for data and instruction as well, there is a bigger performance gain. The L2 cache is ususally split up by the number of cores so an AMD X2 3800+ will have 2 x 512kb L2 cache since there are two cores each having 512kb of cache.

The nm rating is how big an individual transistor is in the chip. 1 nm = 1 nanometer = 1 billionth of a meter. For comparison a strand of hair is about 10,000nm. The nm process of a chip is important in several ways. The smaller the process, the newer the chip is. It also means that the chip will require less voltage to run since it will take less to switch the smaller transistor and less voltage means lower power consumption and cooler operation. A smaller process will usually allow a small headroom for an increase of speed of the CPU. The smaller process is also very beneficial for a CPU manufacturer because they can manufacture more chips from the same wafers yielding more profits.
    
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