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[dvHW] ATI RV770 GPUs have 256-bit memory bus

post #1 of 9
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*Fud Alert*

Source

Quote:
FUD Zilla heard the ATI RV770XT won't have a 512-bit memory bus, the site says it will be 256-bit.

We've posted that RV770XT will be 512 but our usually very reliable sources misinterpreted some parts of the information. The card is 512bit internally as ATI has its internal ring buss memory interface but externally we are talking about the 256bit card.

Both RV770XT and PRO will be the same and they will work with 256bit memory. The RV770XT pairs with 512bit memory and the ultra high speed should help the card improving the performance but from what we know Nvidia’s GT200, Geforce GTX 280 will work with the real 512bit memory controller.

FUD Zilla believes NVIDIA's GT200 GPUs will likely offer big performance gains over ATI's new GPUs but they will cost a lot more.
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post #2 of 9
Yeah if Im not mistaken the big reason the 2900XT was so expensive was the 512bit bus. That means the GT200 cards are going to be very expensive. As if the 8800 Ultra was expensive I think the GT200 will top that price point.
post #3 of 9
That sucks, it looks like Nvidia will have higher memory bandwidth now too when the latest cards go head to head.
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post #4 of 9
I'm surprised they got confused by the internal ring bus specs, as that has been 512-bit since the X800 line, if not before.

Quote:
Originally Posted by QuickS View Post
That sucks, it looks like Nvidia will have higher memory bandwidth now too when the latest cards go head to head.
Not by much.

NVIDIA's GDDR3 will be running much slower than ATI's GDDR5.
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post #5 of 9
Old, old, old, news.

ATi is running a 256-bit bus with GDDR5 which will amount to about the same bandwidth as GDDR4 running with a 512-bit bus but at a much lower price.
post #6 of 9
Quote:
Originally Posted by NrGx View Post
Old, old, old, news.

ATi is running a 256-bit bus with GDDR5 which will amount to about the same bandwidth as GDDR4 running with a 512-bit bus but at a much lower price.
QFT.


Not to mention, Nvidia will likely continue the use of GDDR3 parts, too. As many have said before, just because its a 256-bit interface does not necessarily mean it must have less bandwidth than a 512-bit interface. You must consider the clock speed. If you just do the math it makes sense. Given that right now its easier to use high-speed memory with a smaller bus, we can expect cheaper cards from the simpler architecture.

But I also expect NVidia to take the performance crown just becuase they are shoving much more high-end parts into their product. The only problem is going to be that they wont compete on a price-performance ratio.
    
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post #7 of 9
Quote:
Originally Posted by NrGx View Post
Old, old, old, news.

ATi is running a 256-bit bus with GDDR5 which will amount to about the same bandwidth as GDDR4 running with a 512-bit bus but at a much lower price.
I was going to say the same. I thought everyone knew this...

And if the GTX280 is priced higher than the ultra was at launch, nvidia might as well give half of their customers to ATI. We'll have to see how the 4xxx line compares in real world apps, but if the performance is comparable, who in their right mind would take 512bus with GDDR3 over 256bus with GDDR5?
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post #8 of 9
Quote:
Originally Posted by dankoni View Post
I was going to say the same. I thought everyone knew this...

And if the GTX280 is priced higher than the ultra was at launch, nvidia might as well give half of their customers to ATI. We'll have to see how the 4xxx line compares in real world apps, but if the performance is comparable, who in their right mind would take 512bus with GDDR3 over 256bus with GDDR5?
Memory bandwidth is only part of the performance equation.
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post #9 of 9
Quote:
Originally Posted by QuickS View Post
That sucks, it looks like Nvidia will have higher memory bandwidth now too when the latest cards go head to head.
uhh well...

gddr5 will probably be able to do 4-4.5Ghz reasonably easy according to predictions(a la wikipedia)


4.5*256> 2.1*512
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