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[vr-zone] HD4870X2 to be available by end Jul, custom designs by August - Page 10

post #91 of 95
Quote:
Originally Posted by RussianGrimmReaper View Post
You forget the fact that they only need one PCB and are shooting for a higher market share. They can will sell the HD4870x2 and take not only the performance crown from NVidia, but the market share too. Remember that article a long time ago that in which ATI said they would be getting at least a 40% market share by the end of Q3?
when ATI had more market share than Nvidia, those were the days
post #92 of 95
Quote:
Originally Posted by RussianGrimmReaper View Post
The card WILL retail for $499 USD. The price has been set, and that is it. Both cores will communicate through the vRAM, this will effectively give it a 512bit interface. Since they are communicating through the memory, they will share it! It will have one set of 1GB. Each core will have access to the full 1GB. These things have already been released(the info about how the cores communicate... not the cards)!
Why is everyone getting caught up on 1GB shared vs. 2x512MB shared? The layout of the PCB makes no sense if there was a single contiguous group of chips comprising 1GB of memory. Indeed, looking at the PCB it would appear that each core is directly connected to only 512MB memory, but has access to the other 512MB of memory to make it a total of 1GB memory. Furthermore, there is no "effective" 512bit interface. It is either 512bit, or it is not. In this case, the interface is 256bit and the fact that two GPUs may be pulling from the memory at the same time does not make it 512bit. It is still 256bit, just accessed twice. This goes in line not just with the PCB layout, but also with the info released on core communication that you have mentioned. Finally, I never questioned the price of 1GB version. $499 for 1GB is quite reasonable, but $499 for 2GB is not.

See here for more info on the card with some very good pics of it stripped http://www.xtremesystems.org/forums/...d.php?t=192829

100% guaranteed that each core is directly connected to only 512MB memory. However, the new interprocessor communication interface should allow each to access the other 512MB memory, though with some sort of penalty. There is no 512bit interface and each GPU does not directly access the full 1GB of memory.

Edit: Reviewing that thread again, I noticed there is one interesting thing that shows in the extreme Vantage preset screenshot. The GPUZ application shows 256-bit interface, 1GB GDDR5. Considering that contiguous 1GB block is extremely unlikely, this could in fact mean that the card is shipping with 2GB of GDDR5, 1GB per GPU. That really would be nice, especially for a $499 card
Edited by dejanh - 7/3/08 at 1:26pm
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post #93 of 95
Quote:
Originally Posted by dejanh View Post
Why is everyone getting caught up on 1GB shared vs. 2x512MB shared? The layout of the PCB makes no sense if there was a single contiguous group of chips comprising 1GB of memory. Indeed, looking at the PCB it would appear that each core is directly connected to only 512MB memory, but has access to the other 512MB of memory to make it a total of 1GB memory. Furthermore, there is no "effective" 512bit interface. It is either 512bit, or it is not. In this case, the interface is 256bit and the fact that two GPUs may be pulling from the memory at the same time does not make it 512bit. It is still 256bit, just accessed twice. This goes in line not just with the PCB layout, but also with the info released on core communication that you have mentioned. Finally, I never questioned the price of 1GB version. $499 for 1GB is quite reasonable, but $499 for 2GB is not.

See here for more info on the card with some very good pics of it stripped http://www.xtremesystems.org/forums/...d.php?t=192829

100% guaranteed that each core is directly connected to only 512MB memory. However, the new interprocessor communication interface should allow each to access the other 512MB memory, though with some sort of penalty. There is no 512bit interface and each GPU does not directly access the full 1GB of memory.

Edit: Reviewing that thread again, I noticed there is one interesting thing that shows in the extreme Vantage preset screenshot. The GPUZ application shows 256-bit interface, 1GB GDDR5. Considering that contiguous 1GB block is extremely unlikely, this could in fact mean that the card is shipping with 2GB of GDDR5, 1GB per GPU. That really would be nice, especially for a $499 card
lol exactly, thank you.

was what i was saying before, only i think you explained it better. it makes perfect sense though.

EDIT:

I know its Fudzilla, so maybe dont take it too seriously, but looks like we have 2GB DDR5 confirmation.

Source

The link is from this thread
Edited by gtarmanrob - 7/3/08 at 5:54pm
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post #94 of 95
2 cores with each 1gb still = 1gb in total. The memory kinda works in parallel mode if i remember correctly.
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post #95 of 95
Quote:
Originally Posted by dieanotherday View Post
2 cores with each 1gb still = 1gb in total. The memory kinda works in parallel mode if i remember correctly.
yeah true, but the card itself has a total of 2gb if each core has 1gb. i guess its more of a marketing ploy anyway.

they did the same for the 3870X2. its boxed/advertised as a 1gb card, however each core only has 512mb
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