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<blockquote data-quote="MoltenLava" data-source="post: 42398">You are all forgetting something very important in the equation:&nbsp; __ cache __Modern microprocessors have over 99% cache hit rate with their L1 and L2 cache.&nbsp; Do you know what that means?&nbsp; You'll notice the effect of slow FSB only when there is a cache miss, which is on average 1% of the all time.&nbsp; All the instructions are prefetched for the CPU, and most of data is available when the CPU needs them.&nbsp; The CPU never sits idle waiting for data if it's already in the cache.The effect of fast FSB is small.&nbsp; It's not like CPU where 1GHz G4 is roughly twice as fast as 500MHz G4.&nbsp; FSB speed is important, but it's not going to boost the speed of your computer as you claim.&nbsp; If you did see large performance improvement with faster FSB, you probably misconfigured the cache setting.In other words, 500MHz FSB is not going to be 5x faster than 100MHz FSB when running average applications.&nbsp; It's not even going to be twice as fast.&nbsp; The speed increase will be just barely noticeable.There is an exception, and there are applications that demand A LOT of data constant data transfer which will basically invalidate the cache all the time and cause the data load from main memory.&nbsp; Maybe some 3D game with a lot of textures that need to be loaded frequently.&nbsp; Maybe doing a large matrix calculation.&nbsp; But not word processors or web browsers that people use most of times.</blockquote>

[QUOTE="MoltenLava, post: 42398"] You are all forgetting something very important in the equation: __ cache __ Modern microprocessors have over 99% cache hit rate with their L1 and L2 cache. Do you know what that means? You'll notice the effect of slow FSB only when there is a cache miss, which is on average 1% of the all time. All the instructions are prefetched for the CPU, and most of data is available when the CPU needs them. The CPU never sits idle waiting for data if it's already in the cache. The effect of fast FSB is small. It's not like CPU where 1GHz G4 is roughly twice as fast as 500MHz G4. FSB speed is important, but it's not going to boost the speed of your computer as you claim. If you did see large performance improvement with faster FSB, you probably misconfigured the cache setting. In other words, 500MHz FSB is not going to be 5x faster than 100MHz FSB when running average applications. It's not even going to be twice as fast. The speed increase will be just barely noticeable. There is an exception, and there are applications that demand A LOT of data constant data transfer which will basically invalidate the cache all the time and cause the data load from main memory. Maybe some 3D game with a lot of textures that need to be loaded frequently. Maybe doing a large matrix calculation. But not word processors or web browsers that people use most of times. [/QUOTE]

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