DDR3 VS GDDR5 Graphics cards

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jerodpaul

jerodpaul

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May 28, 2012
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Hi :) yeah, I haven't been on nearly as much as I used to in the last several months.

The Radeon 6670 GDDR5 has a grater...
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blazorthon

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Sep 24, 2010
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GDDR5 can have much higher memory bandwidth. In the case of the two Radeon 7750s that you have in your link, GDDR5 has a huge performance advantage- it can be as much as or even more than about 50% better. The DDR3 version of the Radeon 7750 is not worth buying even if you had to pay $30 more for the GDDR5 version so long as you can afford the extra money. A mere $10 more makes the DDR3 version completely irrelevant, especially since the significantly faster Radeon 7770 is not much more expensive than the Radeon 7750.
 
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blazorthon

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It will be much, much higher than a mere 10-15% higher. These are Radeon 7750s, not weak little things like a Radeon 7350.
 
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renz496

renz496

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Jun 16, 2009
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given if the gpu core is the same cards with GDDR5 could end up faster (which is always the case) compared to the one equipped with GDDR3. with card like 7750 the 2GB of VRAM could be useless. in most cases you will be out of gpu grunt before you can fully use all the available VRAM on it. so my take it is you should pick the one with GDDR5 module.
 
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blazorthon

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Sorry to nitpick, but it's DDR3 for the card in question, not GDDR3 (they aren't the same technology), and there are no gaming situations at all where a Radeon 7750, let alone a Radeon 7750 DDR3, would run into a VRAM capacity bottle-neck with 1GB of VRAM.
 
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stickg1

stickg1

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Mar 7, 2012
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I was just going off of 6670's basically. I had a DDR3 version and also a GDDR5 version, the difference was 10%-15%. I couldn't find benchmarks on the actual 7750's in question so I was just generalizing what I knew from a previous generation's performance.

Oh and Hi, haven't seen ya in while! :wave:
 
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blazorthon

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Sep 24, 2010
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Hi :) yeah, I haven't been on nearly as much as I used to in the last several months.

The Radeon 6670 GDDR5 has a grater advantage over the Radeon 6670 DDR3 when it comes to higher texture levels and such because increasing the settings mixes up the graphics bottle-necks, putting almost exponentially more stress on the memory and such than on the GPU itself. This is greatly compounded on higher end cards such as the Radeon 7750 where the GPU is fast enough to handle decent settings, but DDR3 memory can't handle those settings, making it a huge hindrance instead of a minor inconvenience.

For example, the GT 640 DDR3 versus the GT 640 GDDR5- these are weaker cards than the Radeon 7750 DDR3 and GDDR5 (the GT 640 DDR3, for example, is only about 20% more powerful than the Radeon 6670 DDR3, putting it around the Radeon 6670 GDDR5 on average), yet the difference is still usually around 30% to 40%. The Radeon 7750 GDDR5 is usually around 50% faster than its DDR3 version. That's the difference between putting DDR3 memory on a barely entry level card and putting it on a card that has a GPU about twice as fast as the first card's GPU ;)
 
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