Sign in with
Sign up | Sign in
Your question

Whats the main advantage of 256bit over 128 bit?

Last response: in Graphics & Displays
Share
August 11, 2010 4:41:40 AM

Whats the main advantage of 256bit over 128 bit? I read in some forums that its used for overclocking only, so if i dont plan to OC my vc, then 256 n 128 bit are basically the same?

In case you guys are wondering which card im referring to, its the GT240 GDDR3 128bit vs the 9600GT DDR3 256bit. Some say the 9600GT is faster while others say otherwise, thats why i want to know whats the main advantage of a 256 bit over 128 bit(aside ofcors from doubling the bit)

Thanks.
a c 358 U Graphics card
a b K Overclocking
August 11, 2010 5:32:32 AM

The GT 240 is slower than the 9600 GT.

http://www.xbitlabs.com/articles/video/display/gf-gt240...

256bit offers wider bandwidth than 128bit. Of course if the video chip is slower than compared to another video chip, then all the bandwidth in the world will not help.
m
0
l
August 11, 2010 6:10:02 AM

Theoretically main advantage is wider memory bandwidth and as a consequence better performance. But in real life wider memory bus does not always mean better performance, cause beside bus width there is other elements that compose performance "picture" - like type of memory which can be GDDR3 or GDDR5 and memory operating frequency. Also keep in mind that 128bit bus isnt always bad thing cause its not main limiting factor for the performance of videocard, but core's capabilities. In other words when choosing video adapter the right thing would be to consider not just bus width but other factors as well. In your particular case 9600GT DDR3 256bit will be faster than GT240 GDDR3 128bit cause both cards use same gddr3 type of memory and cores capabilities r pretty close. Whats your budget? I think there is better choices out there in the same price range. Here is good comparison article:
http://www.anandtech.com/show/2906/1
m
0
l
Related resources
August 11, 2010 10:46:31 AM

Now, im really really confused or just a noob, u mean to say that a GDDR3 is actually the same as a DDR3? with or without the " G " doesnt matter?

I've been asking almost the same question for a month now the 9600GT or GT240. Regarding the link u gave me x-bitlab, i've seen the chart before but i dont understand it.

Here's my other link: in this forum they say that GT240 is faster than 9600GT, but then again u guys say otherwise, thats why im very confused.

http://www.tomshardware.com/forum/forum2.php?config=tom...

I ask this question in the above link: In order, from fastest to slowest. They say its correct.

1. GT240 512MB GDDR5 128Bit
2. GT240 512MB DDR3 128Bit
3. 9600GT 512MB DDR3 256Bit (Regular edition, it needs a 6pin)
4. 9600GT 512MB DDR3 256Bit (Green edition, no need for the 6pin)

Thank you.
m
0
l
August 11, 2010 11:16:02 AM

ekg84 said:
Theoretically main advantage is wider memory bandwidth and as a consequence better performance. But in real life wider memory bus does not always mean better performance, cause beside bus width there is other elements that compose performance "picture" - like type of memory which can be GDDR3 or GDDR5 and memory operating frequency. Also keep in mind that 128bit bus isnt always bad thing cause its not main limiting factor for the performance of videocard, but core's capabilities. In other words when choosing video adapter the right thing would be to consider not just bus width but other factors as well. In your particular case 9600GT DDR3 256bit will be faster than GT240 GDDR3 128bit cause both cards use same gddr3 type of memory and cores capabilities r pretty close. Whats your budget? I think there is better choices out there in the same price range. Here is good comparison article:
http://www.anandtech.com/show/2906/1


Now, im really really confused or just a noob, u mean to say that a GDDR3 is actually the same as a DDR3? with or without the " G " doesnt matter?
m
0
l
a b U Graphics card
August 11, 2010 11:46:46 AM

No graphics memory is different from system memory (RAM).
m
0
l
August 11, 2010 11:54:29 AM

Tamz_msc said:
No graphics memory is different from system memory (RAM).


Yup, i know that, what im referring to is the GT240 GDDR3 same as GT240 DDR3 ?
m
0
l
a b U Graphics card
August 11, 2010 11:57:50 AM

Yes, they are the same.
m
0
l
August 11, 2010 1:12:40 PM

Thank you. Damn, for all this time i thought they're different.
m
0
l
a b U Graphics card
a b K Overclocking
August 11, 2010 1:44:58 PM

What you want to look at is the memory bandwidth of the card which is a combination of the memory bit width and the speed and type of memory chip used - as this will give the maximum amount of info that the card can move. This part of the article linked earlier explains it pretty well : (Important points bolded for clarity !!)

Quote:
As is often the case with lower-end products, the GT 240 is actually composed of two specifications. There is a DDR3 based GT 240, and a GDDR5 based GT 240. The former has 25.44GB/sec of memory bandwidth, while the latter has 54.4GB/sec. This results in 3 cards: An $89 GT 240 with 512MB of DDR3, a $99 GT 240 with 1GB of DDR3, and a $99 GT 240 with 512MB of GDDR5.

Officially, NVIDIA says the following about the GT 240: “The GeForce GT 240 sits between the GeForce GT 220 and GeForce 9800 GT in price and performance.” In essence this is intended to be a significantly faster GT 220, a solid card whose only crime was price.

In theory this is a great position for the card, but reality bites, hard. For starters we have the stratification of the cards based on memory bandwidth. A DDR3 GT 240 is not comparable to a GDDR5 GT 240 in most cases, and you’ll understand why when you see our benchmarks. The memory bandwidth starvation when using DDR3 means that the DDR3 GT 240 is often in its own lesser performance class, a problem when most DDR3 GT 240s are equipped with 1GB of the stuff and sell for as much as their GDDR5 brethren.

The other problem is that while the GT 240 is supposed to be below the 9800GT in price, it’s not. It’s certainly below it in performance, but one can easily find just as many sub-$100 9800GTs as one can GDDR5 GT 240s, including a number from higher-tier manufacturers. For all practical purposes the 512MB 9800GT and the 512MB GDDR5 GT 240 come in at the same price, which as we’ll see makes it very hard to justify the GT 240 when you can get a faster card for the same price.


Note : for example the PNY 9600GT spec is :
Quote:
9600GT 512MB, BUS Technology PCI Express 2.0 , Memory Amount 512 MB ,Memory Interface 256-bit , Memory Bandwidth (GB/sec) 57.6 , Fill Rate (billion pixels/sec.) 20.8 , Core Clock (MHz) 650MHz , Memory Frequency (effective) 1.8GHz


So even higher memory bandwidth then the GDDR5 version of the 240 though fairly close ! SO definitely avoid the DDR3 version of the 240 and even with the DDR5 version of the card the 9600GT will be slightly faster but much closer than vs. the DDR3 version of the card !
m
0
l
August 11, 2010 2:06:20 PM

JDFan said:
What you want to look at is the memory bandwidth of the card which is a combination of the memory bit width and the speed and type of memory chip used - as this will give the maximum amount of info that the card can move. This part of the article linked earlier explains it pretty well : (Important points bolded for clarity !!)

Quote:
As is often the case with lower-end products, the GT 240 is actually composed of two specifications. There is a DDR3 based GT 240, and a GDDR5 based GT 240. The former has 25.44GB/sec of memory bandwidth, while the latter has 54.4GB/sec. This results in 3 cards: An $89 GT 240 with 512MB of DDR3, a $99 GT 240 with 1GB of DDR3, and a $99 GT 240 with 512MB of GDDR5.

Officially, NVIDIA says the following about the GT 240: “The GeForce GT 240 sits between the GeForce GT 220 and GeForce 9800 GT in price and performance.” In essence this is intended to be a significantly faster GT 220, a solid card whose only crime was price.

In theory this is a great position for the card, but reality bites, hard. For starters we have the stratification of the cards based on memory bandwidth. A DDR3 GT 240 is not comparable to a GDDR5 GT 240 in most cases, and you’ll understand why when you see our benchmarks. The memory bandwidth starvation when using DDR3 means that the DDR3 GT 240 is often in its own lesser performance class, a problem when most DDR3 GT 240s are equipped with 1GB of the stuff and sell for as much as their GDDR5 brethren.

The other problem is that while the GT 240 is supposed to be below the 9800GT in price, it’s not. It’s certainly below it in performance, but one can easily find just as many sub-$100 9800GTs as one can GDDR5 GT 240s, including a number from higher-tier manufacturers. For all practical purposes the 512MB 9800GT and the 512MB GDDR5 GT 240 come in at the same price, which as we’ll see makes it very hard to justify the GT 240 when you can get a faster card for the same price.


Note : for example the PNY 9600GT spec is :
Quote:
9600GT 512MB, BUS Technology PCI Express 2.0 , Memory Amount 512 MB ,Memory Interface 256-bit , Memory Bandwidth (GB/sec) 57.6 , Fill Rate (billion pixels/sec.) 20.8 , Core Clock (MHz) 650MHz , Memory Frequency (effective) 1.8GHz


So even higher memory bandwidth then the GDDR5 version of the 240 though fairly close ! SO definitely avoid the DDR3 version of the 240 and even with the DDR5 version of the card the 9600GT will be slightly faster but much closer than vs. the DDR3 version of the card !


Thank you.

I'll try to find a 9600GT 512mb Green edition first(Green coz due to my 300w PSU only) , if i cant find one, then i'll get GT240 DDR5 as second choice.
m
0
l
a c 358 U Graphics card
a b K Overclocking
August 11, 2010 3:59:47 PM

The HD 5670 is faster than both 9600 GT (especially the Green edition) and GT 240. It consumes just under 30w of power and will work nicely with a 300w PSU. Do not buy the 1GB version of the HD 5670, benchmarks have shown that there is virtually no benefit having additional 512MB of RAM. Performance improvement is less than 2%.


For clarity when talking about memory on a video card:

RAM = VRAM
DDR = GDDR
m
0
l
August 11, 2010 11:17:59 PM

jaguarskx said:
The HD 5670 is faster than both 9600 GT (especially the Green edition) and GT 240. It consumes just under 30w of power and will work nicely with a 300w PSU. Do not buy the 1GB version of the HD 5670, benchmarks have shown that there is virtually no benefit having additional 512MB of RAM. Performance improvement is less than 2%.


For clarity when talking about memory on a video card:

RAM = VRAM
DDR = GDDR


First of all thank you. Second, yes i've read in an article here at Toms that the 5670 is the Fastest card without a dedicated psu, no need for an auxiliary power connector. The reason I dont need a too good video card is because my aging CPU Pentium D 2.8 will just bottleneck it, and of course the price difference.

Here in the Phils. The 5670 is US 92.00, 9600GT Green is US 76.00, GT240 DDR3 is US 68.00, and GT240 DDR5 is US 78.00. All the mentioned cards are 512MB.


m
0
l
!