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post #11 of 20
Quote:
Originally Posted by Luminosity47 View Post
I'm being quite serious. I didn't really know that they are measured differently between AMD and nVidia's cards. I figured the Core Clock scaling or whatevs would be standardized for both. MY BAD
Different model cards run at different clocks. It works the same with nV and ATI cards, so if you understand this concept regarding nV cards, you also understand it about ATI cards.

Instead of bagging on others for not giving a 'detailed' explanation, why don't you EXPLAIN what the hell you're confused about here ... your just saying "WAT ... Explain" doesn't tell us what your QUESTION is dude
    
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post #12 of 20
Core clock on a GPU is exactly analogous to the concept of the clock speed of a CPU.

It's not 'measurement' (although clock speed certainly can be measured), and it has nothing to do with 'scaling'. It's a specification, set by the manufacturer, for the particular model of card.

Just like you have different models of CPU's with different clock speeds, so are there different models of GPU's with different core (basically the 'cpu' portion of a graphics card) clocks.
Edited by brettjv - 3/30/11 at 4:27pm
    
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post #13 of 20
Thread Starter 
Quote:
Originally Posted by brettjv View Post
Core clock on a GPU is exactly analogous to the concept of the clock speed of a CPU.

It's not 'measurement' (although clock speed certainly can be measured), and it has nothing to do with 'scaling'. It's a specification, set by the manufacturer, for the particular model of card.

Just like you have different models of CPU's with different clock speeds, so are there different models of GPU's with different core (basically the 'cpu' portion of a graphics card) clocks.
I understand that different cards are going to have different speeds on them. That'd be like me asking why my Prius can't do a quarter mile in 10 seconds like my neighbors Ferrari can. I'm just wondering why a 150$ GPU shows a 3 Mhz higher Core Clock than a 500$ GPU is all. Doesn't make sense to me.
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post #14 of 20
Quote:
Originally Posted by Luminosity47 View Post
I understand that different cards are going to have different speeds on them. That'd be like me asking why my Prius can't do a quarter mile in 10 seconds like my neighbors Ferrari can. I'm just wondering why a 150$ GPU shows a 3 Mhz higher Core Clock than a 500$ GPU is all. Doesn't make sense to me.
Because the clock speed isn't the entire card LOL There's... Stream Processors and Memory as well

You also can't directly compare AMD to Nvidia as far as Stream Processors. That GTX 580 performs like 2-3x faster than that 6850.
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post #15 of 20
Thread Starter 
Quote:
Originally Posted by LethalRise750 View Post
Because the clock speed isn't the entire card LOL There's... Stream Processors and Memory as well

You also can't directly compare AMD to Nvidia as far as Stream Processors.
Yeah, I knew that you couldn't directly compare the Stream Processors. But I still don't know why you can't compare the Clock Speed directly.
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post #16 of 20
Quote:
Originally Posted by Luminosity47 View Post
Yeah, I knew that you couldn't directly compare the Stream Processors. But I still don't know why you can't compare the Clock Speed directly.

Because the clock speed is only 1/3 of what makes up the graphics card.. Are you seriously this stupid?
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post #17 of 20
Thread Starter 
Quote:
Originally Posted by LethalRise750 View Post
Because the clock speed is only 1/3 of what makes up the graphics card.. Are you seriously this stupid?
It's only what makes up 1/3 of the graphics card but why can't they be directly compared like memory can? 2 definitions of "Core Clock" speeds? You don't understand what I'm asking, do you..?
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post #18 of 20
Quote:
Originally Posted by Luminosity47 View Post
I thought it was rather obvious. Why is the stock Core Clock on a 500$ GPU 3 Mhz lower than that of a 150$ GPU? That's all I was confused about. I can see that they are different cards lol...
Quote:
Originally Posted by Luminosity47 View Post
I understand that different cards are going to have different speeds on them. That'd be like me asking why my Prius can't do a quarter mile in 10 seconds like my neighbors Ferrari can. I'm just wondering why a 150$ GPU shows a 3 Mhz higher Core Clock than a 500$ GPU is all. Doesn't make sense to me.

Oh ... yeah ... well, it wasn't obvious, obviously

Basically you have to be very careful when you compare specs like core clock (or any other spec) across two totally different architectures like those in use by ATI and nV. An i7 at 2.8GHz will kick the ever-loving crap out of a Pentium 4 at 3.2GHz ... because clock speed isn't everything ... it's all about the totality of the architecture: how many instructions can be processed per clock cycle, how much cache space you have, how efficient the caching process is, etc ... well, the same concepts apply with a GPU core, which is basically just a graphics-centric CPU mounted on a gfx card.

Plus you have lots of other 'extraneous' factors aside from the raw 'core' performance, because a GPU is really like a mini-computer ... so there's lot of other things that decide overall performance on a gfx card, like the counts of texture units, ROP's, tessellation units, available video memory amount and bandwidth, etc.

What this means is that you can only really glean something meaningful out of raw specs if you're comparing two cards that share the same basic architecture ... like a 570 vs. a 580. But when you go comparing ATI cards to nV cards, you really can't do so w/any real reliability.

Bottom-line, if you really want to compare cards, you have to go out and look up benchmarks

Quote:
Originally Posted by Luminosity47 View Post
It's only what makes up 1/3 of the graphics card but why can't they be directly compared like memory can? 2 definitions of "Core Clock" speeds? You don't understand what I'm asking, do you..?
There is NOT two different definitions of core clock speed. Core clock speed is core clock speed, i.e. it just means "what frequency is the gpu core running at". The core speed of two cards can be 'compared directly', as the term always means the same thing ... BUT doing so doesn't tell you anything (useful) about the total performance of the cards you're comparing ... unless they're the same cards aside from the clock speeds.
Edited by brettjv - 3/30/11 at 4:47pm
    
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post #19 of 20
Core clocks are relative to the card's architecture. You can compare the clock speeds of two GTX580s and estimate their relative performance. You cannot solely compare clock speeds between cards of differing make or model to determine their relative performance.
    
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post #20 of 20
Thread Starter 
Quote:
Originally Posted by brettjv View Post
Oh ... yeah ... well, it wasn't obvious, obviously

Basically you have to be very careful when you compare specs like core clock (or any other spec) across two totally different architectures like those in use by ATI and nV. An i7 at 2.8GHz will kick the ever-loving crap out of a Pentium 4 at 3.2GHz ... because clock speed isn't everything ... it's all about the totality of the architecture: how many instructions can be processed per clock cycle, how much cache space you have, how efficient the caching process is, etc ... well, the same concepts apply with a GPU core, which is basically just a graphics-centric CPU mounted on a gfx card.

Plus you have lots of other 'extraneous' factors aside from the raw 'core' performance, because a GPU is really like a mini-computer ... so there's lot of other things that decide overall performance on a gfx card, like the counts of texture units, ROP's, tessellation units, available video memory amount and bandwidth, etc.

What this means is that you can only really glean something meaningful out of raw specs if you're comparing two cards that share the same basic architecture ... like a 570 vs. a 580. But when you go comparing ATI cards to nV cards, you really can't do so w/any real reliability.

Bottom-line, if you really want to compare cards, you have to go out and look up benchmarks
Thank you, that answers my question. I realized at first that Core Clocks couldn't be compared directly, I was just asking WHY. +rep, good sir.
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