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128 vs 256-bit

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  • Graphics Cards
  • Graphics
  • Product
Last response: in Graphics & Displays
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January 21, 2013 1:46:33 PM

I am not entirely sure how to ask this but how much difference is there between 2GB vram on 128-bit or 256 bit?

More about : 128 256 bit

a b U Graphics card
January 21, 2013 1:52:12 PM

256 is faster then 128.
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a b U Graphics card
January 21, 2013 1:53:28 PM

Assuming the RAM is of the same technology (GDDR3 vs GDDR3, GDDR5 vs GDDR5, etc.) and running at the same frequency; doubling the Bus Width will directly double the available memory bandwidth.

Purchasing a GPU based solely on the Bus Width and amount of RAM is probably not the your best option though.
If you could list the exact cards you are looking at, their intended usage and your budget we could help you find your best option.
It would also be helpful if you could post your system specifications including detailed information on your PSU and your monitor resolution.
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January 21, 2013 5:47:28 PM

Yea its all GDDR5 tech but I wondering if 256-bit made a diff in speed for 2GB vs 128-bit. Like for how fast it could access the vram and such. I am not basing it off that though ;) 
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Best solution

a c 89 U Graphics card
January 21, 2013 5:52:57 PM

128 bit and 256 bit are referring to the width of the GPU's Memory Bus.
It is one of three items that define the Memory Bandwidth, the other two being the type of RAM and the speed of the RAM.

Just because a GPU has a wider memory bus does not mean however that it has more memory bandwidth.
As an example, the GTX 260 has a 448 bit memory bus and 111.9GB/s bandwidth where the 4890 has a 256 bit memory bus and 115.2GB/s bandwidth.
This is because the 4890 uses GDDR5 RAM as compared to GDDR3 on the GTX 260.

As for your second question, I would recommend an ATI 6870 for around $230.
It will give you plenty of performance and is priced to move.

that should explain it.

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January 21, 2013 7:12:53 PM

Alright I thought 1gb would be good because I have 2 monitors but I only game on my 19" thats 1440x900. I do want to get 3 in the future though.
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a c 89 U Graphics card
January 21, 2013 7:32:09 PM

2 is better.

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January 21, 2013 7:53:01 PM

Alright thanks for all your help!
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January 21, 2013 7:53:21 PM

Best answer selected by cindylo.
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a c 89 U Graphics card
January 21, 2013 10:53:28 PM

cheers bro :) 

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