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Help for Newbies on why processor A is faster than Processor B.

post #1 of 10
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Okay, so I've seen so many people thinking the Hexacore Thuban by AMD(1055T,1075T,1090t,1100t) processor is faster than the similar Quadcore(from where it stands today, Bulldozer MIGHT change it) from Intel, and that is very untrue.

Firstly the Hexacore won't be noticed by most games, and even if you setup affinity in windows 7 to use all 6 cores in the game you'll see no to very little gain(1FPS ballpark). The reason for this is a mixture of things, including IPC and architectural differences. IPC stands for Instructions Per Cycle, and currently lets AMD does 3 Instructions Per Cycle(from now on to be called IPC), while Intel does 4 IPC. You may ask why this is such a huge difference, and the reason is the Intel chip does more Instructions, thus carrying out more work per cycle, meaning more work per MHz. Intel has had a higher IPC for quite awhile, while a lower IPC can do better, it has to be clocked much higher. If the AMD(Phenom II 955BE) has a IPC of 10@3.2GHz executes 32000000000 instructions per cycle and the Intel(Sandy Bridge 2500k) has a IPC of 15@3.2GHz executes 16000000000 instructions per cycle. Now as you can see, a higher IPC can mean alot, and that is one factor that goes into Intel being faster now adays.

Second is how the program is coded, a heavily threaded program like 3D studio max 2010 is going to have the i7 965 do around the same as the 1090t, while the Cinebench R10 is going to have the 965 do around the same amount in multi-threaded programs, but the single threaded amount will be higher for Intel. Another reason is the cache, the Phenom II 920 with 2MB L2 and 6MB L3 @ 2.6GHz is going to do around the same as a Athlon II 645 with 2MB L2 and no L3 @ 3.1GHz. The two will trade blows depending on the app, sometimes the Athlon II will do faster due to a higher clock speed, but sometimes the Phenom II will pull ahead due to the L3 Cache. Let's explain Cache, Cache for a CPU is memory that helps reduce the time to access memory that it uses the most. L1 cache on the Phenom II is 128KB x4(64KB and another 64KB for each core), L1 is generally Instruction and data, L2 is 512KB x4, and L3 is a shared cache of 6MB for all 4 cores. Now you may ask, why is the Thuban(Phenom II 1xxxT series) slower, even though it has more cache? Well, the Cache is just a factor into the speed, and doesn't help when Intel is much faster clock for clock.

Another major player in processor speeds is the die size. A 45nm processor is generally going to have more heat and higher volts. The smaller a chip gets, the less heat/volts and thus overclock higher(generally). Along with the die shrink is new architecture and that (least in this generation) generally means higher clocks AND higher IPC.

Intel also has this thing called Hyper-Threading which means each core has 2 threads, one is stronger, and the HT thread is weaker, so Intel pulls ahead on this. Bulldozer is going to have 8 cores on two modules with 2 integer cores instead of 1 strong thread and one weak thread, thus making their solution perform better in theory. I hope this helps new people gain more of a grasp on how processors work and why one brand is faster than another, and truly why cores don't matter.
Edited by Anthraxinsoup - 5/25/11 at 3:53pm
    
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post #2 of 10
Thread Starter 
Quote:
Originally Posted by compuman145 View Post
OK seriously, you have a return key for a reason...

Also, a more simple solution than reading and deciphering this complex, comveluted and rather lacking thread is this.

http://www.anandtech.com/bench/CPU/2
I typed it on a phone.
Quote:
Originally Posted by purpleannex View Post
TL;DR

You need to learn how to use paragraphs.



And all anyone ever uses a cpu for is gaming? Thuban vs 1st gen 4 core i7, single thread thuban is worse, multithread can be better or equal.

Anyway, irelevent, right now, just by Sandy bridge, re-evaluate when FX arrives.
False, the Thuban may win in very few situations, but the gaming performance outsets that. Also, I never said just gaming, I just was pointing it out. It very rarely pulls ahead, and when it does is still offset by many other things.
    
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post #3 of 10
Quote:
Originally Posted by Anthraxinsoup View Post
False, the Thuban may win in very few situations, but the gaming performance outsets that. Also, I never said just gaming, I just was pointing it out. It very rarely pulls ahead, and when it does is still offset by many other things.
Dirt 2 and black ops for example benefit from more then 2 cores.. video, photo editing and 3D rendering love having more cores too.
post #4 of 10
Thread Starter 
Quote:
Originally Posted by compuman145 View Post
OK seriously, you have a return key for a reason...

Also, a more simple solution than reading and deciphering this complex, comveluted and rather lacking thread is this.

http://www.anandtech.com/bench/CPU/2
Also, it may be easier to look at benches, and I suggest you do, this is to explain roughly how some processors are faster/slower.
    
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post #5 of 10
Quote:
Originally Posted by Anthraxinsoup View Post
Also, it may be easier to look at benches, and I suggest you do, this is to explain roughly how some processors are faster/slower.
Wide array of benches here - Thuban wins about 1/3 of them, mostly in apps that can utilize the multiple cores.

http://www.anandtech.com/bench/Product/203?vs=47
post #6 of 10
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Quote:
Originally Posted by Iceman23 View Post
Wide array of benches here - Thuban wins about 1/3 of them, mostly in apps that can utilize the multiple cores.

http://www.anandtech.com/bench/Product/203?vs=47
1/3=/=most.

It's good for some things, but not most.
    
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post #7 of 10
I don't know how many people actually think this. It's well documented that SB is the winner vs the x6.
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post #8 of 10
Quote:
Originally Posted by justarealguy View Post
I don't know how many people actually think this. It's well documented that SB is the winner vs the x6.
Is there anyone who thinks a thuban is better than an SB?

That's why I wrote compared to 1st gen i7...

Quote:
Originally Posted by purpleannex View Post
Thuban vs 1st gen 4 core i7, single thread thuban is worse, multithread can be better or equal.

Anyway, irelevent, right now, just by Sandy bridge, re-evaluate when FX arrives.
Quote:
Originally Posted by Iceman23 View Post
Wide array of benches here - Thuban wins about 1/3 of them, mostly in apps that can utilize the multiple cores.

http://www.anandtech.com/bench/Product/203?vs=47
In fairness, the 920 in the benches is only at 2.66Ghz whilst the 1100T is at 3.3ghz, not a fair comparison, this is fairer
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post #9 of 10
Quote:
Originally Posted by Anthraxinsoup View Post
1/3=/=most.

It's good for some things, but not most.
Never said anything about 1/3 being most.
post #10 of 10
Thread Starter 
Quote:
Originally Posted by purpleannex View Post
Is there anyone who thinks a thuban is better than an SB?

That's why I wrote compared to 1st gen i7...





In fairness, the 920 in the benches is only at 2.66Ghz whilst the 1100T is at 3.3ghz, not a fair comparison, this is fairer
The 960 I believe is at 3.3GHz, heck even the 975 is a 920 just binned higher.
    
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