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[Zdnet] AMD Radeon 4800 vs. Nvidia GTX 200 - Page 2

post #11 of 46
Quote:
Originally Posted by Mhill2029 View Post
Shows how much you know about the 4870 then doesn't it. It clearly shows 256Bit itself.

Nice photochop, it has been proven that the HD4870 will have a 512bit bus.
http://www.fudzilla.com/index.php?op...7289&Itemid=34
Edited by QuickS - 5/16/08 at 11:14am
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post #12 of 46
Quote:
Originally Posted by Mhill2029 View Post
Possibly down to bad driver implementation at present. I mean memory management for these cards is all over the place. Also Nvidia are still to release their CUDA software, which could turn everything on it's head. Will GT200 be faster than a 9800GX2? That's the question.....in all likelyhood probably not, but it might be more efficient at things and not so complicated to write for.
That would be a plus for developers but as a developer myself i would use ATI. Simply because of how nVidia has refused to help F@H is a sure sign of how they will treat others in the future.
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post #13 of 46
Quote:
Originally Posted by Licht
I personally believe the G92 core itself is the issue. Since the 9800GTX has less bandwidth then the 8800GTX and more performance. That rules out in my mind that it is bottlenecked in memory.
The memory bus on a graphics card is regarded seperately from the arcitecture of the GPU's core in the same way that the memory bus on a motherboard is regarded seperately from a CPU. The reason that newer cards currently have lower memory bus's than their predecessors is the fact that manufacturers are trying to minimise costs to keep the cards in an affordable price range.

Quote:
Originally Posted by QuickS
Nice photochop, it has been proven that the HD4870 will have a 512bit bus.
No, the HD4870 current spec denotes that it has a 256-bit memory bus. The dual GPU HD4870X2 is scheduled to use two seperate 256-bit bus's. One for each GPU and it's respective set of memory.
Edited by t4ct1c47 - 5/16/08 at 8:37pm
post #14 of 46
Quote:
Originally Posted by t4ct1c47 View Post
The memory bus on a graphics card is regarded sperately from the arcitecture of the GPU's core in the same way that the memory bus on a motherboard is regarded seperately from a CPU. The reason thatnewer cards currently have lower memory bus's than their predecessors is the fact that manufacturers are trying to minimise costs to keep the cards in an affordable price range.



No, the HD4870 current spec denotes that it has a 256-bit memory bus. The dual GPU HD4870X2 is scheduled to use two speerate 256-bit bus's. One for each GPU and it's respective set of memory.
Apart from minimising costs, GPU makers know exactly what's coming in the forseable future in terms of gaming titles and their requirements. It could be a possibility that anything more than 256Bit and 512MB VRAM is clearly not required.

A post i did yesterday highlighting memory usage between DX9 and DX10 showed that memory management in DX10 is far superior. Cutting memory requirements by nearly 50%.
 
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post #15 of 46
Quote:
Originally Posted by t4ct1c47 View Post
The memory bus on a graphics card is regarded sperately from the arcitecture of the GPU's core in the same way that the memory bus on a motherboard is regarded seperately from a CPU. The reason that newer cards currently have lower memory bus's than their predecessors is the fact that manufacturers are trying to minimise costs to keep the cards in an affordable price range.
I never said anything about the memory bus.
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post #16 of 46
Quote:
Originally Posted by t4ct1c47 View Post
The memory bus on a graphics card is regarded sperately from the arcitecture of the GPU's core in the same way that the memory bus on a motherboard is regarded seperately from a CPU. The reason that newer cards currently have lower memory bus's than their predecessors is the fact that manufacturers are trying to minimise costs to keep the cards in an affordable price range.



No, the HD4870 current spec denotes that it has a 256-bit memory bus. The dual GPU HD4870X2 is scheduled to use two seperate 256-bit bus's. One for each GPU and it's respective set of memory.
From what I have read from multiple sources the regular HD4870 will use GDDR5 and have a 512bit bus. Why would they bottleneck their GDDR5 with a 256bit bus? That would make no sense and they would be better off with a 512bit bus and GDDR3.
http://www.fudzilla.com/index.php?op...7289&Itemid=34
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post #17 of 46
Quote:
Originally Posted by QuickS View Post
From what I have read from multiple sources the regular HD4870 will use GDDR5 and have a 512bit bus. Why would they bottleneck their GDDR5 with a 256bit bus? That would make no sense and they would be better off with a 512bit bus and GDDR3.
http://www.fudzilla.com/index.php?op...7289&Itemid=34
256-bit 4-4.5GHz GDDR5 gives more then enough bandwidth.
post #18 of 46
those look like the stats of the 4850... from what has been posted before
from several sources... the 4870 was suppose to have gddr5 memory, with
a 512bit bus... some sources also include that the 4870 will have 1gb of memory.
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post #19 of 46
Quote:
Originally Posted by Ikon View Post
256-bit 4-4.5GHz GDDR5 gives more then enough bandwidth.
It wont be running at 4GHZ though, AMD stated that they weren't able to clock it up that high. Even if it was that fast why would they waste the money with the new GDDR5 tech on the old 256bit bus when they could have very fast GDDR4 on a 512bit bus?
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post #20 of 46
Quote:
Originally Posted by Wrapper View Post
those look like the stats of the 4850... from what has been posted before
from several sources... the 4870 was suppose to have gddr5 memory, with
a 512bit bus... some sources also include that the 4870 will have 1gb of memory.
No ... they are using GDDR5 instead so they don't have to use a 512bit bus. 512bit bus's cost a ridiculous amount to manufacture, which is why AMD moved to using a narrower bus but much faster ram (4-4.5 ghz)

The 4870 will have 512mb
the 4870x2 will have 2x512 so basically 1gb
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