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Gddr3 Vs. Gddr5

Last response: in Graphics & Displays
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June 27, 2012 2:42:36 AM

whats the difference between GDDR3 and GDDR5 and would a 2gb(GDDR3) card be just as good as a 1gb(GDDR5) card?

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a c 196 U Graphics card
June 27, 2012 2:47:50 AM

The memory size alone tells you absolutely nothing about the performance of the card, the GPU that the memory is attached to is what determines if the memory affects performance at all. Larger and faster memories are more important for memory intensive GPU applications like AA, but a slow GPU with 2GB of GDDR3(like a GT 430) is going to do much worse at everything than a fast GPU with only 1GB of GDDR5(like a GTX 560 Ti). The extra memory serves no purpose except to lure in naive buyers since the GPU isn't nearly fast enough to even make full use of 1GB of memory, the 1GB of memory on a faster GPU may limit it in certain situations but it will still be much faster than a slow GPU with 2GB.
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a c 91 U Graphics card
June 27, 2012 2:52:20 AM

GDDR stands for Graphics Double Data Rate, the number after it is the version. newer versions of GDDR memory implementations carry more bandwidth. this has nothing to do with actual memory size. so we can not compare 2GB of GDDR3 with 1GB of GDDR5. the GDDR3 has twice the space, but much smaller bandwidth for real-time data transfer. however, I can say that generally the 1GB of DDR5 will be more useful

if you're curious however, here's how this graphics memory will be used: essentially, your video card's processing core, or the GPU chip, will render an image in anticipation of what you're running, store it in the graphics memory, and pull it when it needs to show it on your screen. this process needs to be fast and smooth for a fluid viewing experience (or high frames per second). For simplicity's sake, let's say that generally, GDDR3 does not have enough bandwidth to fully utilize the 2GB, meaning that if you actually wanted to pull images that large from it, you can't be pulling the data fast enough for your game to play smoothly. meanwhile, if the image you need is bigger than 1GB, then even though your GDDR5 memory has the bigger bandwidth, you would still not have a smooth gameplay experience because there isn't enough memory space.

generally, 1GB is enough for a single 1920x1080 monitor. so if that's what you're running, go with 1gb of GDDR5 memory
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a c 91 U Graphics card
June 27, 2012 2:54:12 AM

hunter315 said:
The memory size alone tells you absolutely nothing about the performance of the card, the GPU that the memory is attached to is what determines if the memory affects performance at all. Larger and faster memories are more important for memory intensive GPU applications like AA, but a slow GPU with 2GB of GDDR3(like a GT 430) is going to do much worse at everything than a fast GPU with only 1GB of GDDR5(like a GTX 560 Ti). The extra memory serves no purpose except to lure in naive buyers since the GPU isn't nearly fast enough to even make full use of 1GB of memory, the 1GB of memory on a faster GPU may limit it in certain situations but it will still be much faster than a slow GPU with 2GB.


I agree completely. the memory business comes from a sad bragging tradition from when memory sticks were expensive, and you can impress your geek friends by saying "dude, I have 1GB of RAM!!!", as your computer will actually run faster... nowadays hardly any system is bottle necked by memory space
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