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General question about memory bandwidth, interface and clock? Core?

Last response: in Graphics & Displays
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April 28, 2011 4:59:08 PM

Dear Community,

I have been recently started to do some overclocking on my Radeon Hd 5770, in doing so I see numbers going up in the GPU-Z such as the memory bandwidth. I have seen charts indicating all different Ati's and Nvidia's Graphics cards, showing most clear differences on their Memory transfer Rate.

My question is On actual gaming and frames per second, which is more important memory bandwidth, Speed or Core clock? I know Memory transfer rate is dependent on memory interface and memory Speed, but which creates a greater effect on Gaming Core or Memory transfer rate? Any short clear explanation would be appreciated, and if possible such as in which type applications are more dependent on Core Speed vs Memory Speed, and Transfer rate? Thanks in Advance
a c 125 U Graphics card
a b } Memory
April 28, 2011 5:11:06 PM

Well as you know memory bandwidth is related to memory speed (and type) and also the interface/bus width (for example 256bit)... I would hazard a guess that games that use alot of VRAM would benifit most from increased bandwidth speed.

From the overclocking I've done on various cards I've found increasing the core clock more benificial in terms of FPS increase than increasing the memory speed.
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a b U Graphics card
April 28, 2011 5:13:24 PM

The 3 big ones are:

Core Clock
Shader Clock
Memory Clock

That's also listed in order of importance.

Memory bandwidth (transfer rate) will increase in response to these clocks rising, specifically the memory.

Edit: Derp, put core speed affecting mem bandwidth. my bad.
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a c 125 U Graphics card
a b } Memory
April 28, 2011 5:20:43 PM

borisof007 said:
The 3 big ones are:

Core Clock
Shader Clock
Memory Clock

That's also listed in order of importance.

Memory bandwidth (transfer rate) will increase in response to these clocks rising, specifically the memory and core.


Memory bandwidth doesn't increase if you up the core speed....
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April 28, 2011 5:51:15 PM

Thanks a lot, Core speed is the most dominant Factor. I appreciate Fast response.
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April 28, 2011 6:08:22 PM

What is core speed do you mean? Is it Engine Clock for ATI and Graphic Clock for Nvidia? Thanks
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April 28, 2011 6:16:33 PM

In my case I have a Radeon HD 5770 and it says core speed. Not sure about Nvidia.
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a b U Graphics card
April 28, 2011 7:04:10 PM

Core speed is the speed of the processor, whether a GPU or CPU. Example: Your Intel quad core would be running at, say, 3.2 GHZ. That 3.2 GHZ is the CPU's "clock speed". It's why you hear the term "overclocking", to force a CPU or GPU to run at higher speeds than what they originally came with.

The higher a GPU's core clock, the faster it is, and the more performance it'll give (as a general rule). Of course, other factors are important, such as memory clock (the speed of the video card's RAM) and the Shader clock speed.
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May 20, 2011 6:20:44 PM

Best answer selected by cronos177.
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a c 271 U Graphics card
May 20, 2011 6:33:18 PM

This topic has been closed by Mousemonkey
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