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ati being clocked higher?  

post #1 of 9
Thread Starter 
Why is it whenever i look up ati vs nvidia sti is always clocked higher..so why the flame wars of.nvidia is.better? Ati cards are clocked highr on everything.
post #2 of 9
You cant realy compare clock speeds between the 2 cards. Completly different architecture.
post #3 of 9
Higher core clock does not mean everything I had a gtx 6870 at 950 core but it is not as good as my 570 at 800.
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post #4 of 9
Thread Starter 
So if the mem clock is higher and it has more memory plus its clocked faster..it can still be slower? Can someone explain this to me please?
post #5 of 9
The Nvidia fans will say it doesn't matter.I think it does show AMD's slightly better,heat and power draw too for the most part.Compare the 6990 and 590 for instance.
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post #6 of 9
Cuda.
    
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post #7 of 9
Quote:
Originally Posted by AppetiteNZ View Post
You cant realy compare clock speeds between the 2 cards. Completly different architecture.
This. AMD cards also have A LOT more cores then nvidia.
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post #8 of 9
its has to do with the cycles per clock for the shaders of each architecture.

example:

Nv shader units.. or SP's do 3:1 ..meaning cycles per clock
Ati shader units.. or SP's are 1:1 ..again, cycles per clock

..its also part of the reason why a given ATI GPU will have many more SP's than its rival NV counterpart. Neither makes them superior to the other.
post #9 of 9
I'm going to lock this thread before it turns into a flame war.

Some reasons for this are:
1) Comparing the newest generation of each brands cards, each nV core does more work per clock cycle. Just like an i5 Sandy Bridge at 2.6GHz will utterly destroy a 1st generation Phenom at 4.0GHz, the two graphics chips have different architectures, leading nV to accomplish slightly more 'work' at lower clocks.

2) nV shaders (aka CUDA cores) can handle longer, more complex instructions on a single shader, whereas on ATI shaders (they call them Stream Processors), complex code may have to be split amongst more than one SP.

3) The shaders on nV cards are running at 2:1 vs the core clock speed, whereas on the AMD cards, the ratio is 1:1. Thus, while the 'core' itself is clocked lower on nV cards, the CUDA cores are clocked much higher than the AMD Stream Processors

4) Memory clocks aren't important in and of themselves, you have to look at memory BANDWIDTH, which is a function of clocks, memory bus, and memory type (ddr3, ddr5, etc). nV cards may have lower memory clocks, but they have wider memory buses, which makes the actual bandwidth match much more closely than the memory clocks.

There's also a ton of other things to consider when it comes to a gfx card ... ROP's, Texture Units, Tessellation capabilities, the method by which AA is calculated, the relative efficiencies of caching algorithms, the total count of threads that can be simultaneously kept 'in flight' ... I could go on and on

Bottom-line, when it comes to performance, there's a WHOLE LOT more to a graphics card than just the clocks. Clocks alone mean next to nothing is the truth.

That's why you have to look at benchmarks, not at raw specs, when it comes to comparing graphics cards. This is especially true when comparing AMD and nV cards, because their architectures are WILDLY different. An nV CUDA core is NOT an AMD Stream Processor, even though they're both loosely called 'shaders' by both sides.

If you're just comparing clocks ... it's like comparing apples and oranges.
Edited by brettjv - 6/1/11 at 1:21am
    
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