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DDR3 Memory Standard Set - Page 3

post #21 of 32
Quote:
Originally Posted by DesertRat View Post
OK, n00b question...

then what exactly is the difference between Gddr and DDR?

I know they are different, but how?
GDDR3 is basically DDR2 with loose timings and 2V stock voltage.

GDDR4 - not sure, but I think they are still based on DDR2 technology (since the frequency range isn't that much changed and the voltage is pretty much the same).

GDDR5 is sampling from Samsung and it's likely it's based on DDR3, but that's just supposition.
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post #22 of 32
Thread Starter 
I guess my new system will get DDR3
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post #23 of 32
Quote:
Originally Posted by dragosmp View Post
GDDR3 is basically DDR2 with loose timings and 2V stock voltage.

GDDR4 - not sure, but I think they are still based on DDR2 technology (since the frequency range isn't that much changed and the voltage is pretty much the same).

GDDR5 is sampling from Samsung and it's likely it's based on DDR3, but that's just supposition.
Comprehensive differences of GDDR3 vs GDDR4.

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

http://www.overclock.net/graphics-ca...r4-review.html
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post #24 of 32
GDDR4 is more similar to DDR3 than DDR2, significantly decreased power consumption, higher bandwidth at the expense of increased latencies.

Basically not that great in terms of performance increases.
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post #25 of 32
Quote:
Originally Posted by Znth View Post
GDDR4 is more similar to DDR3 than DDR2, significantly decreased power consumption, higher bandwidth at the expense of increased latencies.

Basically not that great in terms of performance increases.

Read my comparison of GDDR3 vs GDDR4 above. A 50% data rate increase is noticable. Latency doesn't matter as much as bandwidth on video memory. Besides... GDDR4 does have lower latency.
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post #26 of 32
Yet another reason to wait lol, i can see it now

Quote:
IMO, I would wait for DDR3 before building a PC
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post #27 of 32
Well, I successfully skipped DDR2...yet...I may fall to DDR3.
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post #28 of 32
DDR3 Will be nice for server's and other systems using multi-processor solutions.
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post #29 of 32
So wait, DDR2 is supposedly 2.5V while DDR is 1.8?

Then why does my DDR2 run at 1.8V and my DDR ran at like 2.3V?
    
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post #30 of 32
im still DDR-1
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