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Why is the i5's Performance so much better even though stats are the same?

post #1 of 49
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Hi, i'm building my first PC soon, and was for sure going AMD all the way (Phenom II X4 975BE and up), then someone said check out the i5, and i did but i didn't seem like it was much better stat wise (both around 3.4 GHz) and then i looked at a benchmark and it said the i5 was about 30-50% faster in all categories, i'm going to be gaming, but i still want a powerful CPU to fold@home. and it also seems the i7 isn't any better but costs 100+$ more. help?
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post #2 of 49
i5 is better clock for clock and is better for folding temps are lower
post #3 of 49
architecture differences.

even tho the clock cycles are teh same frequency, the workload that is completed after each cycle is different.
there are 2 different concepts with current cpus:
do less work but at a higher frequency. OR do more work but at a lower frequency.

right now amd aims for a higher frequency with less work completed per cycle and intel does the other.

the fact is that intel cpus can both do more work and overclock a boatload than their amd counterparts. thats why intel>amd.
Edited by tyuo9980 - 7/31/11 at 11:18am
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post #4 of 49
There is more to consider then number of cores and clock speed.

Your main factors should be.

1. Manufactuering Process (Lower is better)
2. Number Of Cores (Higher is better)
3. Stock Clock Speed (Higher is better)
4. TDP (Lower is Better)

When we put all these things into perspective you will find the Core i5 2500k is a much better CPU.
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post #5 of 49
Im not 100% sure about this but I think the reason i7 is a better chip than i5 is because it has virtual cores where i5 just has its 4 cores. Having the 4 extra virtual ones increases the performance thus the price difference.
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post #6 of 49
i7 will fold twice as fast as i5 at the same clock speed since folding can take advantage of extra 4 threads
    
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post #7 of 49
Quote:
Originally Posted by 0rion View Post
Im not 100% sure about this but I think the reason i7 is a better chip than i5 is because it has virtual cores where i5 just has its 4 cores. Having the 4 extra virtual ones increases the performance thus the price difference.
Intel's Hyper Threading.

http://www.overclock.net/blogs/darkc...explained.html
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post #8 of 49
Quote:
Originally Posted by 0rion View Post
Im not 100% sure about this but I think the reason i7 is a better chip than i5 is because it has virtual cores where i5 just has its 4 cores. Having the 4 extra virtual ones increases the performance thus the price difference.
Are you joking?...Surely you know what HT is?

@OP i5 2500k can be used to fold bigadv, you need native linux to run it. performance/$ wise 2500k is unbeatable at the minute.
post #9 of 49
Quote:
Originally Posted by robwadeson View Post
i7 will fold twice as fast as i5 at the same clock speed since folding can take advantage of extra 4 threads
100% not true
post #10 of 49
So what would be the most cost-effective and cheaper than sandy bridge setup for an AMD Phenom II build for overclocking so it would match or at least keep up with the sandy bridge...if even possible?
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