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Gpu vs Cpu

post #1 of 17
Thread Starter 
Hey guys... I'm wondering something... if GPU's are that much faster than CPUs, then how come we even need to use CPUs anymore? Why don't we throw out the cpu and spend all our money on GPUs? CPU is optimized for arithmetic logic, while GPU is optimized for graphics processing including vectors and such?
post #2 of 17
Cause something has to tell the computer what to do, GPUs don't do that. Learn more then ask.
    
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post #3 of 17
troller be trollin?
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post #4 of 17
Quote:
Originally Posted by r3vo1ution1991 View Post
troller be trollin?
Sounds like a legitimate question.

Because a GPU is just that, a Graphics Processing Unit. Both CPUs and GPUs can encode video but usually a GPU can do it faster.

I'm sure someone will offer a more in depth answer.
    
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post #5 of 17
Thread Starter 
Hmm... I learn by asking?

Anyways, I know that people program, say, their parallel ant colony optimization algorithms on it from my thesis research, using CUDA, and thus it seems clear to me that a GPU might be able to do what a CPU can do, just a whole lot faster?
post #6 of 17
Quote:
Originally Posted by verythaiguy View Post
Hmm... I learn by asking?

Anyways, I know that people program, say, their parallel ant colony optimization algorithms on it from my thesis research, using CUDA, and thus it seems clear to me that a GPU might be able to do what a CPU can do, just a whole lot faster?
I guess it just depends on the task. I'm not sure if GPUs even have cache or anything or how the registers work. I only really know the architecture of a CPU.
    
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post #7 of 17
No not really, cpu's are like human brains and the graphics cards are like the eyes of a human. A cpu tells everything what to do and the rest just fallow what ever the cpu tells it to do.
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post #8 of 17
There's a lot of stuff going on when playing a game that the CPU (and the rest of the system like the ram and hd) are better suited for than the GPU. GPU is specifically architected for graphics-related tasks, but there's a lot of other stuff going on beside pure graphics when gaming.

For example, calculating all the necessary statistics when gaming ... think about when you play a game like Diablo, and every time you strike something, there's a flood of calcs that have to happen in order to figure out the damage your strike does. There's also calculating the AI, and a number of popular physics engines like Havoc are designed for the CPU ...

Basically the CPU is better suited for certain tasks/calcs involved in gaming that are NOT the graphics parts. So the coders use the hardware that's the best for each part of the job ...
    
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post #9 of 17
Quote:
Originally Posted by r3vo1ution1991 View Post
troller be trollin?
Chill out dude, legitamite question is legit
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post #10 of 17
Its the way GPUS work, mythbusters did a fantastic job of showing that a if a CPU is like a single fire paint ball gun, and a GPU is like a 1000 barrel wall of multicolored balls to make a not only higher quality image but so that we see in frames. A CPU uses simply math to execute commands but a GPU uses some intense math to create the image we see. Imagine tesselation.
    
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