how much does the clock differences of different manufacturers change the performance to video cards?

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MrHakisak

MrHakisak

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I want to sell my 2xHD7870's because of the lack of drivers support, updates and compatability. im wanting to get a GTX 780 but many manufacturers have different clock speeds at different price ranges. how much does this effect the performance, should i be spending more for a higher clock speed? im getting it off this website: http://www.pccasegear.com/index.php?main_page=index&cPath=193_1483&vk_sort=1
i should be getting a lot better performance right? crossfire has stuttering issues, display corruption and many problems that AMD dont give a single shit about.
 
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photonboy
Clock rates:
They actually do vary quite a bit. Here's how it works ignoring any overclocking potential (same GPU such as GTX780). The Video RAM must also scale to prevent being a bottleneck:

1) Card A max GPU frequency is 900MHz
2) Card B max GPU frequency is 1100MHz

1100/900 = 1.22

This means that the MAXIMUM frame rate increase Card B would give is 22.2% higher. In the real-world it would depend on whether the graphics card was the sole bottleneck or not (the CPU might be a bottleneck, or you might be running with VSYNC and locked to 60FPS).

Or in terms of FRAME RATES at the same quality:
Card A system-> 50FPS
Card B system-> 50FPS to 61.1FPS (in that range depending on the CPU, the game, and the settings of the game such as...
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MrHakisak

MrHakisak

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so the extra $100 EVGA video cards that are clocked that little higher basically have less than %5 performance increase?
 
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photonboy

photonboy

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Clock rates:
They actually do vary quite a bit. Here's how it works ignoring any overclocking potential (same GPU such as GTX780). The Video RAM must also scale to prevent being a bottleneck:

1) Card A max GPU frequency is 900MHz
2) Card B max GPU frequency is 1100MHz

1100/900 = 1.22

This means that the MAXIMUM frame rate increase Card B would give is 22.2% higher. In the real-world it would depend on whether the graphics card was the sole bottleneck or not (the CPU might be a bottleneck, or you might be running with VSYNC and locked to 60FPS).

Or in terms of FRAME RATES at the same quality:
Card A system-> 50FPS
Card B system-> 50FPS to 61.1FPS (in that range depending on the CPU, the game, and the settings of the game such as whether VSYNC is used)

What GTX780?

I've been recommending the EVGA GTX780 967MHz model (ACX cooler), but the main decisions are:

1) Decide on the series (i.e. GTX780) for relative performance

2) Choose based on VALUE (Cost versus GPU frequency).

3) Ensure quality construction (good customer feedback), reasonably low noise etc.
 
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MrHakisak

MrHakisak

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ok cool
the Gigabyte GeForce GTX 780 3GB GHz Edition looks about right. although you recomended the EVGA video card, its $60 extra and has 38MHz LESS boost clock. by the way, i have an i7-2600, Asrock Z77Extreme4 Mobo, Corsair 4x4gb RAM and OCZ 850W Gold PSU.

 
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i7Baby

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I think you seem to get either fast or quiet and cool. I prefer the latter and therefore like Asus better. If you want them to go faster (and become hotter and noisier) the current drivers do that anyway. And you can easily overclock them further with Afterburner.
 
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