Expreview reports RV775 to have 840SP; RV775XT to be released in late January

[AzN]

http://en.expreview.com/2008/1...ve-nvidia-a-punch.html

Move over Nvidia. New king has arrived. :brokenheart:

 

[aldamon]

Posts at Rage3D indicate this is fake.

 

[error8]

GDDR3 at 2800mhz??? Is that possible? I thought that the highest possible for ddr3 is at 2500 mhz.

And how is it that even though they come with more SPs, they have a lower number of transistors. Fishy stuff....

 

[TC91]

Originally posted by: error8
GDDR3 at 2800mhz??? Is that possible? I thought that the highest possible for ddr3 is at 2500 mhz.

And how is it that even though they come with more SPs, they have a lower number of transistors. Fishy stuff....

it could be gddr4...

 

[SunnyD]

Originally posted by: TC91

Originally posted by: error8
GDDR3 at 2800mhz??? Is that possible? I thought that the highest possible for ddr3 is at 2500 mhz.

And how is it that even though they come with more SPs, they have a lower number of transistors. Fishy stuff....

it could be gddr4...

Or more likely GDDR5 which they already use.

God, reading that article drips of sensationalism and false rumors.

 

[Extelleron]

It is not possible to have 840SP, much less 840SP & 48 TMU, without a radical change compared to the RV770 architecture. Clearly fake.

And if that isn't enough, imagine the power consumption of a RV775XT with 840SP @ 950MHz on the same 55nm as the HD 4870, which has 800SP @ 750MHz and already consumes as much as the GTX 260 C216.

 

[AzN]

Originally posted by: Extelleron
It is not possible to have 840SP, much less 840SP & 48 TMU, without a radical change compared to the RV770 architecture. Clearly fake.

And if that isn't enough, imagine the power consumption of a RV775XT with 840SP @ 950MHz on the same 55nm as the HD 4870, which has 800SP @ 750MHz and already consumes as much as the GTX 260 C216.

Did they need a radical change in 4830 or 4670? Seems to me it's credible considering it's coming from EXPREVIEW. They've been spot on and release benchmarks before cards are even released.

Better yields, . Lower voltage, smaller transistors can play a role here for power consumption. Notice the transistor count has decreased.

 

[AzN]

Originally posted by: TC91

Originally posted by: error8
GDDR3 at 2800mhz??? Is that possible? I thought that the highest possible for ddr3 is at 2500 mhz.

And how is it that even though they come with more SPs, they have a lower number of transistors. Fishy stuff....

it could be gddr4...

Or they are really talking about ddr speeds as in 700/1400 or not.

The core clock of RV775Pro has also been upgraded to 725MHz, and memory clock updates to 1400MHz. RV775Pro might be using GDDR4.

 

[TC91]

Originally posted by: SunnyD

Originally posted by: TC91

Originally posted by: error8
GDDR3 at 2800mhz??? Is that possible? I thought that the highest possible for ddr3 is at 2500 mhz.

And how is it that even though they come with more SPs, they have a lower number of transistors. Fishy stuff....

it could be gddr4...

Or more likely GDDR5 which they already use.

God, reading that article drips of sensationalism and false rumors.

well gddr5 is quad pumped (qdr) and not dual pumped (ddr)

 

[aldamon]

http://www.rage3d.com/board/sh....php?t=33935368&page=5

 

[Lonyo]

Originally posted by: error8
GDDR3 at 2800mhz??? Is that possible? I thought that the highest possible for ddr3 is at 2500 mhz.

And how is it that even though they come with more SPs, they have a lower number of transistors. Fishy stuff....

NV reduces transistor counts for the 7900 over 7800. It was simple really, they just removed some features, because they are nice like that
But with tweaking maybe it would be possible, certainly to reduce die size although reducing transistor count is a little more questionable.

 

[Extelleron]

Originally posted by: Azn

Originally posted by: Extelleron
It is not possible to have 840SP, much less 840SP & 48 TMU, without a radical change compared to the RV770 architecture. Clearly fake.

And if that isn't enough, imagine the power consumption of a RV775XT with 840SP @ 950MHz on the same 55nm as the HD 4870, which has 800SP @ 750MHz and already consumes as much as the GTX 260 C216.

Did they need a radical change in 4830 or 4670? Seems to me it's credible considering it's coming from EXPREVIEW. They've been spot on and release benchmarks before cards are even released.

Better yields, . Lower voltage, smaller transistors can play a role here for power consumption. Notice the transistor count has decreased.

That's different, simply cutting units isn't hard - the 4830 simply reduces from 800/40 -> 640/32 (SP/TMU). Same thing with the RV730, except there AMD doubled the ratio of TEX:SP, so instead of 320/16 you had 320/32.

Here you would be talking about a complete rearranging of units; you can't go from 800/40 -> 840/48 using the same design as R7xx.

 

[AzN]

Originally posted by: Extelleron

Originally posted by: Azn

Originally posted by: Extelleron
It is not possible to have 840SP, much less 840SP & 48 TMU, without a radical change compared to the RV770 architecture. Clearly fake.

And if that isn't enough, imagine the power consumption of a RV775XT with 840SP @ 950MHz on the same 55nm as the HD 4870, which has 800SP @ 750MHz and already consumes as much as the GTX 260 C216.

Did they need a radical change in 4830 or 4670? Seems to me it's credible considering it's coming from EXPREVIEW. They've been spot on and release benchmarks before cards are even released.

Better yields, . Lower voltage, smaller transistors can play a role here for power consumption. Notice the transistor count has decreased.

That's different, simply cutting units isn't hard - the 4830 simply reduces from 800/40 -> 640/32 (SP/TMU). Same thing with the RV730, except there AMD doubled the ratio of TEX:SP, so instead of 320/16 you had 320/32.

Here you would be talking about a complete rearranging of units; you can't go from 800/40 -> 840/48 using the same design as R7xx.

How do you explain 4670? Were they cut too? Considering it has 32TMU with only 320SP. Looks like they rearranged it just fine without much of a problem.

 

[EnzoLT]

Originally posted by: Extelleron

Here you would be talking about a complete rearranging of units; you can't go from 800/40 -> 840/48 using the same design as R7xx.

they would have to cut each simd to 14 blocks for 12 total simd. so thats 12*14*5=840 SPs.
since each simd has 4 TMUs. 12*4=48 TMU's.

shouldnt be that hard to make a few changes to the architecture.just cut out some blocks.

 

[AzN]

Or they didn't have to cut anything. They just added 40SP and TMU because there was room in the PCB.

 

[BFG10K]

The specs look reasonably believable IMO. I don't believe ATi?s unit ratios are as fixed in stone as they are with nVidia?s hardware.

Also a reduction of transistors is quite possible. As was pointed out earlier, nVidia did it with the 79xx series by optimizing the layout and trimming unneeded transistors.

 

[Cookie Monster]

Its a fake obviously. Somehow the die size/transistor count decreased but an increase in more logic units.. Doesn't make sense when 40nm is just around the corner. What i think is that its RV770XTXnot a different chip althogether as this RV775 suggests. Since over time yields improve, ATi can release a higher clocked part in the form of this new card in response to the GTX285/265? (if such exist) threat. It would be a complete waste of time/effort and money.

 

[AzN]

Originally posted by: BFG10K
The specs look reasonably believable IMO. I don't believe ATi?s unit ratios are as fixed in stone as they are with nVidia?s hardware.

Also a reduction of transistors is quite possible. As was pointed out earlier, nVidia did it with the 79xx series by optimizing the layout and trimming unneeded transistors.

That's what I think as well. I don't think ATI's hardware has fixed SP and TMU ratio. RV770 originally had 32TMU and they added 160SP and 8 TMU at the last minute because they had room on the PCB. Tweaked core for smaller transistors could easily happen. We'll see what will happen in January.

 

[EnzoLT]

if they dont cut anything, itll be uneven.....thats when they really have to change the architecture. i dont think you can have one simd with 16 blocks then another with only 4........

 

[ronnn]

Originally posted by: aldamon
Posts at Rage3D indicate this is fake.

Well they obviously don't want traffic.

 

[lavaheadache]

Originally posted by: aldamon
Posts at Rage3D indicate this is fake.

but that doesn't make it so.

If true that's one monster card that I'll probably pony up the loot for

 

[Blackfirevatsal]

i think it will be clear that it is fake or true in the end of the dec