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Vram amount vs Memory Bandwith?

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  • Graphics Cards
  • Memory
  • Graphics
  • Product
Last response: in Graphics & Displays
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a b U Graphics card
February 24, 2011 12:28:55 AM

I have a HD 4650 DDR2 1gb.
I want to upgrade to a HD5670 (need low profile and low power for OEM system)
Would you pick a 5670 with 512mb GDDR5 or 1gb DDR3 with all other
factors being equal (price,clock speed etc)
Any articles that can be linked would be appreciated.
Opinions,rants,raves or general rambling is ok :D 

More about : vram amount memory bandwith

February 24, 2011 12:47:31 AM

whats your budget, are you planning on gaming? Due to those low profile gaming cards, you most liking going to gaming on 1280x1024 or less, so 512 should be fine. High memory Bandwidth is better for video cards that have much higher than 1gb, it always better performance instead of being bottlenecked.
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a b U Graphics card
February 24, 2011 12:55:33 AM

I mostly do MSoffice,Photoshop and multimedia (ripping,recording netflix,encoding)
With my HD 4650 I play Bioshock high settings/1920x1080,left for dead high settings/no AA 1920x1080 and Crysis Warhead 1280x1024 mainstream settings.
So I figure the HD5670 will be fine.
I know with GDDR5 the bandwith is faster and so is memory clock speed.
Since I OC my card I figure the 512mb GDDR5 would be better but I wanted some opiniions.
I am not even sure if the HD 5670 will take advantage of 1gb vram or not even at 1920x1080
In general if you have a choice between GDDR5 512mb or ddr3 1gb which you you picfk?
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a b U Graphics card
February 24, 2011 12:57:07 AM

budget is under $100 USD.
For my needs I really dont want to spend too much
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February 24, 2011 12:59:31 AM

GDDR5 is a little over kill for multimedia,office and Photoshop. I'd just go for the 1GB :) 
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a b U Graphics card
February 24, 2011 1:41:43 AM

wolf201 said:
GDDR5 is a little over kill for multimedia,office and Photoshop. I'd just go for the 1GB :) 


I know that with my HD4650 1gb it doesnt take advantage of the
Vram it has according to alot of posts I have seen from members I respect.
So I am not sure if with the 5670 if it will use the 1gb effectively.
With Gddr5 I can really overclock the memory hard compared to DDR3
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February 24, 2011 4:16:35 AM

hd 4670 with ddr2 is real crap.if you have a budget of $100.then you can have many choices kindly tell us your powersupply!and its brand.
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a b U Graphics card
February 24, 2011 4:25:35 AM

The question of the thread is which is more important
Vram or Memory bandwith.

I am already set on a HD 5670 after reading all the reviews
including Toms Best video card articles where they pick 5670 as top choice under $100.

Would you rather have 512mb GDDR5 or 1gb DDR3 is the question?
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a c 365 U Graphics card
a b } Memory
February 24, 2011 6:03:48 PM

Memory bandwidth is more important for the HD 5670. Below is a link to an Axle Radeon HD 5670 1GB DDR5 review. One of the card it is reviewed against is a typical HD 5670 512MB DDR5 card. There are hardly any difference in the game benchmarks which indicates that the extra 512MB only improves performance by 2 frames at best and typically less than 1 frame on average. Therefore, the extra 512MB of DDR5 RAM is more or less worthless unless the price difference is very, very small.

1GB of DDR3 RAM may actually lower the performance since DDR3 has lower bandwidth than DDR5. If price was the same, then 512MB of DDR5 without a doubt.

http://www.xbitlabs.com/articles/video/display/axle-rad...

Note that there is a typo in the review in the "Axle Radeon HD 5670 1GB GDDR3" introduction. It does indeed use DDR5.
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February 24, 2011 6:10:59 PM

jaguarskx said:
Memory bandwidth is more important for the HD 5670. Below is a link to an Axle Radeon HD 5670 1GB DDR5 review. One of the card it is reviewed against is a typical HD 5670 512MB DDR5 card. There are hardly any difference in the game benchmarks which indicates that the extra 512MB only improves performance by 2 frames at best and typically less than 1 frame on average. Therefore, the extra 512MB of DDR5 RAM is more or less worthless unless the price difference is very, very small.

1GB of DDR3 RAM may actually lower the performance since DDR3 has lower bandwidth than DDR5. If price was the same, then 512MB of DDR5 without a doubt.

http://www.xbitlabs.com/articles/video/display/axle-rad...

Note that there is a typo in the review in the "Axle Radeon HD 5670 1GB GDDR3" introduction. It does indeed use DDR5.

I am completely agree with this.1gb ddr3 is worse than 512mb ddr5.less bandwidth,less clock and less memory speed.
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Best solution

a c 124 U Graphics card
a b } Memory
February 24, 2011 6:22:36 PM

Yeah I'd get the 512mb GDDR5 version. The things that use up the most VRAM like AA and big textures also require a lot of rendering power, so basically a midline card like the 5670 isn't even going to be able to take advantage of the extra VRAM most of the time.
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a b U Graphics card
February 24, 2011 6:48:23 PM

Thanks for the replies.
Everything I have been reading online was saying the same thing.
I figure that with the Gddr5 I can also get a stronger memory OC also.
I bought a HD4650 1gb a few months ago but I knew the Vram was
wasted but the card was cheap so I didnt care.
I wasnt sure whether the HD 5670 would take advantage of extra ram
or not
so this answers my question.
Thanks again for the replies
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a b U Graphics card
February 24, 2011 6:49:57 PM

Best answer selected by king smp.
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