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GDDR3 vs GDDR4 in Review

post #1 of 24
Thread Starter 
GDDR3 vs GDDR4
1) 7.2 vs 11.2 GBps per chip max data speed
2) 1.8 vs 2.8 GBps per pin max data rate
3) 1.8 vs 1.5 v minimum power consumption which results in a 20-25% energy savings
4) 2.1 vs 1.9 v maximum power for overclocking
5) 4 vs 8 bit burst length which allows more memory bandwidth and lower latency
6) no DBI vs DBI: Data Bus Inversion - it takes more energy to transfer 0s than 1s. When there are a lot of 0s to move, it will send them as 1s instead and then use DBI to signal that all those 1s needed to be flipped back to 0s. This is a power saving feature.
7) Three point voltage control via video card driver for fine tuning and overclocking

As a comparison, the X1900xt uses GDDR3 at 1.45GHz while the X1950xtx uses GDDR4 at 2GHz. This difference helps the the X1950xtx get 64GBps memory bandwidth over the 46.4GBps of the X1900xt. As for the future, GDDR5 is expected in 2008 and will use 1.2-1.5v. The next GDDR interation might be in 2010 and use 1.2v max.


Source: Computer Power User Magazine
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post #2 of 24
OMG, you talk about DDR5 alrdy? hehe
Only one DDR4 card out there right now. SO DDR5 is still TOO far away.
Who know what happen. Also No one know what voltage of the DDR in 2010.
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post #3 of 24
Interesting.

Do you think those figures make a noticeable difference in todays games? Are there games that take advantage of the extra bandwith from DDR4?
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post #4 of 24
Thread Starter 
Quote:
Originally Posted by Joeking78 View Post
Interesting.

Do you think those figures make a noticeable difference in todays games? Are there games that take advantage of the extra bandwith from DDR4?
Yes, GDDR3 is pretty much at its limit. The future is GDDR4!

@ATI83, the specs of future GDDR aren't set yet. However, engineers are working on it and probably do have a good idea of the voltages. It takes years to develop the technology.
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post #5 of 24
Quote:
Originally Posted by DuckieHo View Post
GDDR3 vs GDDR4
1) 7.2 vs 11.2 GBps per chip max data speed
2) 1.8 vs 2.8 GBps per pin max data rate
3) 1.8 vs 1.5 v minimum power consumption which results in a 20-25% energy savings
4) 2.1 vs 1.9 v maximum power for overclocking
5) 4 vs 8 bit burst length which allows more memory bandwidth and lower latency
6) no DBI vs DBI: Data Bus Inversion - it takes more energy to transfer 0s than 1s. When there are a lot of 0s to move, it will send them as 1s instead and then use DBI to signal that all those 1s needed to be flipped back to 0s. This is a power saving feature.
7) Three point voltage control via video card driver for fine tuning and overclocking

As a comparison, the X1900xt uses GDDR3 at 1.45GHz while the X1950xtx uses GDDR4 at 2GHz. This difference helps the the X1950xtx get 64GBps memory bandwidth over the 46.4GBps of the X1900xt. As for the future, GDDR5 is expected in 2008 and will use 1.2-1.5v. The next GDDR interation might be in 2010 and use 1.2v max.


Source: Computer Power User Magazine

I'm pretty sure they've got that backwards. 1's mean current, 0's mean no current. How could no current POSSIBLY take MORE energy to send current then NO current?

http://www.bookrags.com/Binary_numeral_system
Quote:
Operational characters 1 and 0 stand for 1 = on = closed circuit = true 0 = off = open circuit = false
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post #6 of 24
Thread Starter 
Quote:
Originally Posted by Ihatethedukes View Post
I'm pretty sure they've got that backwards. 1's mean current, 0's mean no current. How could no current POSSIBLY take MORE energy to send current then NO current?

http://www.bookrags.com/Binary_numeral_system
Depends on what you define as 0 or 1. It you want high as 1, then fine. If you want high as 0, then fine. Not sure about specific implemenation.

Or... the constant signal is high. To create a 0 signal, they use transisitors to close a gate. Powering the transistors is the actual energy cost. Therefore, a 0 signal is more expensive.
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post #7 of 24
whats with all these old threads getting dug up outta no where?
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post #8 of 24
This ought to make the HD 2900 XT 1GB owners smile.
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post #9 of 24
Thread Starter 
Quote:
Originally Posted by ElMikeTheMike View Post
whats with all these old threads getting dug up outta no where?
Thread is still pertinent and I did link it twice this week.
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post #10 of 24
As far as I know, 1's are ALWAYS current. If this changed, please let me know. However, they're speaking about transferring of signal. In the transfer of signal there's only one way to expend energy throwing current across the circuit. They specifically talk about a singular bit that swaps the 1s and 0s. If you were to charge ONE 0 to a 1 but swapped it for 50 (of 64 bits) 1s changing to 0s you're gonna get a net power savings of a lot. If is takes 20 (number pulled from my ass) other 0s swapping to 1's to do it you've STILL got a net 'profit' of 14+20=34>50 current carrying bits.

Above and beyond that, what you're saying is akin to claiming it might take more energy for you to flip the light switch off on the lamp than just leave it on. That better be one damned efficient lamp if switching it off takes more energy than using it. Logically, if things were that efficient, we wouldn't even be looking for power savings anymore, would we?

I'm fairly certain it's just a big typo.

You'd think that with a 64bit bit pathway
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