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[NHW] RV740 ES using GDDR5

post #1 of 41
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Quote:
AMD currently has RV740 cards running with 900Hz GDDR5 (that's 3600MHz effectively) in the lab. Exactly why they have chosen to use GDDR5 with a chip that is supposed to be mainstream is a bit hard to say, but it may just be to test it without memory bandwidth limitations. AMD were testing RV730 cards with much higher memory frequencies than those seen in stores. The RV740 silicon is A11 revision, board is B507/895 and the GDDR5 is Qimonda/IDGV1G-05A1F1C-40X. Whether the GDDR5 is justified or not is hard to say, but what if it is?
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post #2 of 41
So is GDDR5 the next GDDR3, then?
    
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post #3 of 41
its all about xdr
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post #4 of 41
Quote:
Originally Posted by OverclockTheStock View Post
its all about xdr
The cost negates the performance advantage over DDR - I honestly don't know of any products using XDR aside from the PS3. Even it only has a 64-bit memory bus.
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post #5 of 41
pretty sure ES means engineering sample right ?

i don't think it holds much water
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post #6 of 41
Quote:
Originally Posted by carl25 View Post
pretty sure ES means engineering sample right ?

i don't think it holds much water
their just trying out the possibles.

In the future, ATI could use a 64-bit card and pair it up with GDDR5 memory vs. 128-bit with GDDR3.

The better solution? We'll see...
post #7 of 41
Quote:
In the future, ATI could use a 64-bit card and pair it up with GDDR5 memory vs. 128-bit with GDDR3.
That sounds like a very valid option, using faster memory and narrowing memory bus would allow them to use heaps less silicon which seems to be ATi's current strategy... beat competition with very capable products that sell dirt cheap!
post #8 of 41
If the prices of GDDR5 drop a bit, it actually might make it a more cost efficient way to build the chip as bomfunk mentioned that less silicon will be used with a narrower memory bus. The cost of the silicon is pretty stable but the cost of the GDDR5 lowers as it becomes more mainstream.

Or just like how AMD demonstrated their flexibility with memory types on the HD4670 by integrating a DDR3 memory controller on the GPU, maybe they are simply incorporating the GDDR5 controller onto the GPU and then waiting for the right time to introduce mainstream cards with GDDR5.
    
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post #9 of 41
Quote:
Originally Posted by Duesco View Post
So is GDDR5 the next GDDR3, then?
GDDR3 still isn't seen in many low and mid end chips. But i think GDDR5 will be part of many many more chips now that a second company has announced their take on it. Especially since they promise more speed for less cost.
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post #10 of 41
Yea, back on topic. Can someone explain why a smaller bus is better? Does it just use less silicon or what?
    
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