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What makes a cpu better than another - Page 4

post #31 of 38
I don't think it needs years.. specially if you have high IQ and time.. just look at the past few CPU benchies from different sites.. find info on the posted CPU's.. interpolate..

sounds easy right?

if not.. it just takes time.. may be years like Duckie said I guess.. if you barely have any "extra" time xD
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post #32 of 38
yeah, it is not that hard, look at the drivers, the efficiency, instructions per cycle.... yeah... but what i was surprised about was no matter what you are looking at with the sb vs phenom II the sb kicks it and then some
post #33 of 38
Quote:
Originally Posted by venomblade View Post
I'm not fighting you on this or anything, but how does it get better performance just because of the architecture? Is there more to a cpu's performance past it's actual specs? Lower power consumption i can see due to a smaller die right? 45nm or w/e it is.
Ok, I wrote this yesterday, but OCN went up the creek as I was posting...

Imagine two cities of similar size and population.

One has narrow streets, badly designed one way sytems, slow speed limits, confusing junctions, you have to drive 2 miles round when you could have got there in one mile, people drive around doing single passenger car journeys, lorry's half full with goods, no public transport, no trains.

The other city has three lane high ways conecting all parts of the city, faster speed limits, better junctions that don't grid lock you, theres an advanced infrastructure of public transport, buses that take the room of three cars carry 18x as many people, lorry's are full of goods, trains move even more people.

Your cpu is like a city with millions of streets, how the architect designed those streets to interact with each other and transport the population is all important.
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post #34 of 38
Is this a good analogy to explain how one processor is better than another?

Let's say you have a clock-esque object that has 1000 dots on it.
You have an AMD and Intel CPU both clocked at 3.30GHz, which is how fast the hand travels around the clock.
The AMD CPU recognizes 950 out of 1000 dots
The Intel CPU recognizes 985 our of 1000 dots

Since the Intel recognizes more dots per pass it's more efficient.
Edited by harmor - 4/14/11 at 8:33am
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post #35 of 38
In the days of the A64 vs the P4 A A64 3200+ at 2 ghz was as fast as a P4 at 3.2 ghz
The A64 did 9 operations per second, the P4 did 6
9 ops * 2 ghz = 18 ghz/ 6 so 3 ghz roughly P4 speeds

So when I overclocked my A64 from 2 ghz to 2.6 I had the performance of a P4 3.6 ghz
9 * 2.6 / 6 = 3.9
post #36 of 38
Quote:
Originally Posted by The Duke View Post
And...
The amount of cache a CPU has is often overlooked.
Only seen him post maybe twice since I've been on OCN... ^_^ I feel happy now.
     
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post #37 of 38
How many calculations it can do per clock cycle.
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post #38 of 38
As has been said, look at benchmarks whenever you notice a new one and remember the numbers. You could go into more detail about what instructions and stuff the CPU's use to get that advantage, but I just memorize the performance of one CPU in a series and then use that to estimate the perf of the rest of the CPU's in that series.

I owned an E8200. If I want to know the performance of an E8400, I take the performance of my E8200 and multiply it's FPS to roughly match the FPS of an E8400. 3 GHz /2.66 GHz = 12% increase. Apply to E8200's perf and you get a rough estimate. As clock differences go higher and higher, this becomes less and less accurate of course, but since the CPU's in the same series have the same architecture (and often same amount of cache), it is an acceptable of getting that estimate.
I know that my E8200 performed way better at 3.5 GHz than 3 GHz, but 3.8 GHz didn't make a noticeable difference and this also has to be taken into consideration.

Only when comparing CPU's with different architectures does it become difficult. Then you have to remember the performance of each of the series you're comparing and remember what each is good at.

A Phenom II X6 @ 4 GHz vs a Core i5 2500K @ 5 GHz would be tough(ish).
Knowing from the reviews I've read that the Phenom II's perform worse per clock, I know that the i5 will destroy the Phenom II in programs that don't utilize more than 4 cores (e.g. almost all games), because the i5's 4 cores are faster than 4 of the Phenom's cores. OTOH the Phenom has 50% more cores for programs that do support more cores (e.g. video encoding, 3D rendering) and will have a core advantage there, but even then, it still has a lower clock speed and each of those clocks perform worse (I know this from reviews, not just because it's AMD ). Then on top of that we have cache, programs that prefer one side over the other, etc. etc.

To sum up: The performance of CPU's with identical architecture is often easy to estimate by looking at clock speeds (but expect that the performance doesn't scale 1:1 with clock speed, e.g. a 20% clock speed increase will usually only give about 15% perf increase), while CPU's with different architecture are impossible to compare directly based purely on clock speed and cache. You need to know the numbers for CPU's with different architectures, there's no easy way.

I assume that I'll get corrected, flamed and reported for posting such a wall of BS, but this is how I do and it's served me well. Of course I look up reviews if I'm unsure, but this is a nice quick way to compare CPU's.
Edited by B!0HaZard - 4/14/11 at 10:21am
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