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Who is hyperthreading for?

post #1 of 11
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So I just got my i5-2500k after ditching AMD...... whoa. whoa. WHOA! The heck was I waiting for?!?!? This thing rocks for everything I do, faster, more responsive, it rips through every graphics intensive game i play without even flinching, this CPU is AWESOME! I dont know about you guys but whenever I get something that's a huge improvement and so much better than what I used to have I suddenly get this weird power hungry feeling and want even MORE! I'm thinking about building an i7-2600k rig, while using the 2500k for guests to play on when I'm lanning, and I don't think I'll be able to stop myself hah.In short I've never had a hyperthreading cpu before and I want to know who is it marketed towards and why?
post #2 of 11
If you have a quad core, it makes 2 threads per core. So 8 threads with a quad core cpu. Like adding 4 more virtual cores, just lets more stuff work on one core. 2 threads for access, kind of like a tree. One limb has 2 branches. If you have 4 limbs, you have 8 branches. More bugs can live on the branches smile.gif (More processes can be processed on one core) Like my analogy?
Edited by Grath - 10/17/11 at 12:41pm
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post #3 of 11
It shows it's strength on high thread count, data intensive applications. Such as Encoding, decoding, folding, things of that nature.

Gaming wise it's not a factor.
     
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post #4 of 11
Kind of behaves like an 8 core which is useless in gaming, so unless you do video editing/rendering and all those stuff you won't need it, + the 2500k OC's better.
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post #5 of 11
Unless you do things like video encoding or professional quality graphics design etc. you won't need hyperthreading. I bought my i7-950 thinking hyperthreading would be worth it. When I look at cpu activity it almost always is only using 4 of the 8 virtual cores. I've only caught it using all 8 a handful of times.

I would stick with the 2500K. You could put the money into faster RAM, SSD, or a better video card and see more of an improvement in performance.
    
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post #6 of 11
2600k is for 3D rendering or video rendering, stuff like that, is only 25% faster than 2500k.
i actually did what you did, my parts should be here by the end of the week. but i did have a i7 920 last winter so i'm not sure how surprised i will be.
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post #7 of 11
Quote:
Originally Posted by kchris;15344319 
So I just got my i5-2500k after ditching AMD...... whoa. whoa. WHOA! The heck was I waiting for?!?!? This thing rocks for everything I do, faster, more responsive, it rips through every graphics intensive game i play without even flinching, this CPU is AWESOME! I dont know about you guys but whenever I get something that's a huge improvement and so much better than what I used to have I suddenly get this weird power hungry feeling and want even MORE! I'm thinking about building an i7-2600k rig, while using the 2500k for guests to play on when I'm lanning, and I don't think I'll be able to stop myself hah.In short I've never had a hyperthreading cpu before and I want to know who is it marketed towards and why?

Hyperthreading is ideal for those who either fold or have applications which make use of threads efficiently, such as 3ds Max, Photoshop, Sony Vegas Pro and such. It gives you additional virtual cores on your processor, aka threads. A four core CPU with hyperthreading will have 4 real cores and 4 virtual cores, making 8 threads. That's about as basic as it can probably be explained.
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post #8 of 11
It makes the processor more efficient. That's all there is to it.
    
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post #9 of 11
Quote:
Originally Posted by daydream99;15344382 
It makes the processor more efficient. That's all there is to it.

If the processor is running a program that can utilize all the cores/virtual cores that is... If you aren't running software that can exploit hyperthreading then it isn't even used and you might as well have a normal quad core.
    
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post #10 of 11
In hyperthreading, each core has two sets of data registers. So when two threads are allocated to a core, there is no penalty for switching between them.

In a normal core with only one set of registers, switching threads requires the cpu to dump the first thread's data to the heap, and then load the second thread's data from memory to fill the registers. Switching back incurs the penalty again. ~10% performance is lost just by switching threads in a modern cpu.

Hyperthreading can greatly improve performance in applications which can take advantage of more than 4 cores. If a thread has to stall for a few cycles while waiting for i/o, the other thread can be switched so that the cycles are not wasted. In a normal cpu, the switching penalty is too large to make it worthwhile, unless the number of unused cycles is large enough.

Hyperthreading is not a gimmick, but if you don't need it it won't help you.

Currently, gaming does not require > 4 cores in almost every case, so you don't need it.
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