AMD: R7xx Speculation

[Dave Baumann]

On a per pin basis one is double data rate and another is quad data rate.

 

[Lukfi]

=>Nebuchadnezzar: I know I used that acronym a few pages back, but I haven't been following the discussion since. QDR is no specific type of DRAM, it means Quad Data Rate and I was proposing a theory (based on the clocks GPU-Z(?) detected), that GDDR5 could physically run at quarter the effective speed, transporting data 4 times per clock, instead of classic DDR where the physical frequency is half the effective frequency. Who knows...

 

[Mintmaster]

On a per pin basis one is double data rate and another is quad data rate.

So I guess when people say the "real" clock of 3.6GHz GDDR5 is only 900MHz, the latter refers to internal RAM chip clock, and the communication is still using a 1.8 GHz clock with a transfer on both the rising and falling edges, right?

 

[digitalwanderer]

LOVE the new sig Dave!

 

[Lukfi]

So I guess when people say the "real" clock of 3.6GHz GDDR5 is only 900MHz, the latter refers to internal RAM chip clock, and the communication is still using a 1.8 GHz clock with a transfer on both the rising and falling edges, right?

Umm, I thought if the effective clock is 3,6 GHz, then the data are simply "sent" 3,6 billion times per second, or not?

 

[Nebuchadnezzar]

So I guess when people say the "real" clock of 3.6GHz GDDR5 is only 900MHz, the latter refers to internal RAM chip clock, and the communication is still using a 1.8 GHz clock with a transfer on both the rising and falling edges, right?

They should have stayed with either the effective frequency all along or added some kind of "QEDR - quad effetice data rate" somewhere with the nomenclature, many won't know that 900MHz GDDR5 is twice as fast as 900MHz GDDR3/4 Either that or just forget the internal working clock.

 

[Lukfi]

When I write memory frequencies, I always use the effective rate. Unfortunately, many people don't...

 

[Shtal]

Test Results:Notice that the Sapphire Radeon HD 4850 graphics cards actually beats out the NVIDIA GeForce 9800 GTX+ without the help of Physics. With Physics enabled the NVIDIA card with PhysX support gets a boost to the overall score thanks to the performance gained in the CPU test. The physics speedup carries a 25% weight on the final 3DMark score at the Performance Preset. http://www.legitreviews.com/article/731/14/

I did wonder that ATI 4870 should be 30% percent faster then ATI 4850. So in 3DMark Vantage it should score ~P8300 points. "The question remain - is it worth extra cash for 4870 ??"

 

[Dave Baumann]

So I guess when people say the "real" clock of 3.6GHz GDDR5 is only 900MHz, the latter refers to internal RAM chip clock, and the communication is still using a 1.8 GHz clock with a transfer on both the rising and falling edges, right?

Indeed. But we're transitioning to referring to pin rate - i.e. 3.6Gbps.

 

[AlphaWolf]

I did wonder that ATI 4870 should be 30% percent faster then ATI 4850. So in 3DMark Vantage it should score ~P8300 points. "The question remain - is it worth extra cash for 4870 ??"

When I multiply 7274 by 1.3 I get ~9400. Are any of the cards over $200 worth it?

 

[spajdr]

this is so retarded to include physX to total Vantage score ...

 

[eastmen]

this is so retarded to include physX to total Vantage score ...

its just more of the same , 3dmark has allways provided benfits to nvidia cards in the game test while pushing benfits to ati into none scoring tests

 

[BRiT]

this is so retarded to include physX to total Vantage score ...

I think it's a major deficiency to have one base total score. They should have kept the GPU, CPU, and Physics tallies separate.

 

[Shtal]

When I multiply 7274 by 1.3 I get ~9400.

You are right!

Are any of the cards over $200 worth it?

If ATI 4870 performs very close to GF9800GX2 and you have 24" or 30" inch monitor, "AND" If 4870 drops to range ~$270.00 US dollars - then it might worth it.

 

[tacopaco]

whats the release date for r700? if the performance is right that's the card ill be getting also i hope the drivers will be decent on release....

 

[Shtal]

whats the release date for r700? if the performance is right that's the card ill be getting also i hope the drivers will be decent on release....

August 2008.

Question! Why do you want to get 4870X2 ??

 

[Shtal]

I was wondering if ATI will unlock extra 40 or 50 stream processors for RV770XT "HD4870". = Total 840 or 850 stream processors.

 

[Dave Baumann]

I think it's a major deficiency to have one base total score. They should have kept the GPU, CPU, and Physics tallies separate.

With the current strcuture that wouldn't be particularly telling either. In actual games physics and graphics would be contending for the same resources and in the GPU accelerated case you would effectively be "double scoring" graphics and physics scores.

 

[Rebel44]

I was wondering if ATI will unlock extra 40 or 50 stream processors for RV770XT "HD4870". = Total 840 or 850 stream processors.

It would be nice to do it at least for 4870x2

 

[tacopaco]

Question! Why do you want to get 4870X2

Because i have a single pci-e 2.0 motherboard crossfire on a stick and such...
Why does it matter its not set in stone I am hoping they turn out great if they don't ill get a gtx280 whatever works.
Do you have something against it? Seems like you have a chip on your shoulder.