RV775XT and PRO have 840 SP?

[onethreehill]

RV775XT to be launched in Jan 2009
RV775PRO to be launched in Mar 2009
Source:Expreview

Translator

[Stukov]

so, they added a cluster and plan to jack up the clocks?

[Shintai]

More SP, more TMU etc. And less transistors? And massive core clock changes.

Sounds very wishful...

Personally I would just guess its a respin with abit higher clocks.

RV775XT sounds like a nuclear furnance. And dualslot cooling for RV775Pro and with GDDR4?

[Stukov]

More SP, more TMU etc. And less transistors? And massive core clock changes.

Sounds very wishful...

Personally I would just guess its a respin with abit higher clocks.

RV775XT sounds like a nuclear furnance. And dualslot cooling for RV775Pro and with GDDR4?

Maybe they removed some stuff that didn't work or didnt increase speed? Made it more efficient?

[RPGWiZaRD]

I think 1GB vram default might have been better for these cards which cheaper 512MB versions offered slightly later or simililarly in smaller quanitity. I don't doubt there will be 1GB but I think that should become the default version, and 512MB would be treated as HD4870 1GB version as far as availability goes. If they wanna have something to compete with GTX 285 in sales that is, as consumers like the bigger capacity usually if cost is around the same or near. But I doubt RV775XT will cost more than $299 though and GTX 285 will prolly end up $399(+) so there will be some difference in price probably but I'd still have liked to see 1GB default.

[SNiiPE_DoGG]

the fact it says the xt is 512mb makes me think BS on these numbers... why would ATI release a card meant to compete with the 285 with this mem...? especially with the advantages 1gb gave to the 4870 in the ever increasing sized market for high res performance

[Shintai]

March 2009 for the RV770Pro ponders me. Because either the info is fake. Or 40nm parts are farther away than we thought.

the fact it says the xt is 512mb makes me think BS on these numbers... why would ATI release a card meant to compete with the 285 with this mem...? especially with the advantages 1gb gave to the 4870 in the ever increasing sized market for high res performance

Ye that too.

[tajoh111]

How the heck did they add shaders, texture units, drop transister count, reduce size(without switching to a new manufacturing process) and vastly increase coreclocks to liquid cooling levels. Kind of find this hard to believe considering this is supposed to be a modest revision. I also find the bump in texture units off considering the increase in shaders.

Also why have such a powerful card that could kill anything below 1600*1200 and castrate it where it's power will not be overkill by giving it 512mb of memory?

I know AMD has been showing magic lately but this seems a little impossible. These sound like the specs of little dragon almost and rv870 like.

Sounds like a fake leaked rumor to me by AMD to deflate the NV launch of the gtx 285 and 295.

[Stukov]

How the heck did they add shaders, texture units, drop transister count, reduce size(without switching to a new manufacturing process) and vastly increase coreclocks to liquid cooling levels. Kind of find this hard to believe considering this is supposed to be a modest revision. I also find the bump in texture units off considering the increase in shaders.

Also why have such a powerful card that could kill anything below 1600*1200 and castrate it where it's power will not be overkill by giving it 512mb of memory?

I know AMD has been showing magic lately but this seems a little impossible. These sound like the specs of little dragon almost and rv870 like.

Sounds like a fake leaked rumor to me by AMD to deflate the NV launch of the gtx 285 and 295.

They are probably just speculation. I bet it is a mix of some bits of information from a 40nm respin and a 55nm respin.

[clonez]

me wants xt for new rig in jan, but PLEASE, better idle power consumption

[donitsi]

This would make things very interesting
March for PRO doesn't like too good though

[Mats]

me wants xt for new rig in jan, but PLEASE, better idle power consumption

I'm just plain confused about idle power consumption for the 4850, have the power consumption dropped with newer SKU's or drivers or not?

Anandtech: The 4850 system uses 43 W more in idle than the GTX 260 system.
Bit-Tech: The 4850 and the GTX 260 system uses the same amount of power in idle.

[RPGWiZaRD]

Wasn't the issue that 2D clocks didn't work correctly at first and was fixed later?

[Shintai]

I'm just plain confused about idle power consumption for the 4850, have the power consumption dropped with newer SKU's or drivers or not?

Anandtech: The 4850 system uses 43 W more in idle than the GTX 260 system.
Bit-Tech: The 4850 and the GTX 260 system uses the same amount of power in idle.

i780 SLI/x38(Bit-tech) vs i790 SLI (Anandtech) maybe

x38 is far superiour to i780 in power consumption. (Anything is hoho)

[Miss Banana]

I'm just plain confused about idle power consumption for the 4850, have the power consumption dropped with newer SKU's or drivers or not?

Anandtech: The 4850 system uses 43 W more in idle than the GTX 260 system.
Bit-Tech: The 4850 and the GTX 260 system uses the same amount of power in idle.

If you update the bios of a 4850, the idle clocks are set way way lower than what is the case with the stock bios. This makes the 4850 consume less power than the gtx 260 in idle.

[roadie]

This is rubbish. Effective 2800Mhz GDDR3 on a high, yet still midrange part? There are so many uneducated guesses in this table it's ridiculous!

[Boissez]

This is rubbish. Effective 2800Mhz GDDR3 on a high, yet still midrange part? There are so many uneducated guesses in this table it's ridiculous!

... must be GDDR4 then.

[Voodoo²]

RV670

4 SIMD cores * 16 modules * 5 Alus (4+1) = 320 sp
4 TMU per SIMD unit = 16 TMUs

RV770

10 SIMD cores * 16 modules * 5 Alus (4+1) = 800 sp
4 TMU per SIMD unit = 40 TMUs

RV775 ???

12 SIMD cores * 14 modules * 5 Alus (4+1) = 840 sp
4 TMU per SIMD unit = 48 TMUs

or

6 SIMD cores * 28 modules * 5 five Alus (4+1) = 840 sp
8 TMU per SIMD unit = 48 TMUs

I think is fake cause the 512MB doesn´t look good but the math is doable. I don´t know much about GPU´s and their internal structures and how they work but maybe if RV775 is true is just a rearrengement of this structures too make it easier to program and to make it more efficient.

[Helmore]

RV670

4 SIMD cores * 16 modules * 5 Alus (4+1) = 320 sp
4 TMU per SIMD unit = 16 TMUs

RV770

10 SIMD cores * 16 modules * 5 Alus (4+1) = 800 sp
4 TMU per SIMD unit = 40 TMUs

RV775 ???

12 SIMD cores * 14 modules * 5 Alus (4+1) = 840 sp
4 TMU per SIMD unit = 48 TMUs

or

6 SIMD cores * 28 modules * 5 five Alus (4+1) = 840 sp
8 TMU per SIMD unit = 48 TMUs

I think is fake cause the 512MB doesn´t look good but the math is doable. I don´t know much about GPU´s and their internal structures and how they work but maybe if RV775 is true is just a rearrengement of this structures too make it easier to program and to make it more efficient.

RV670 and RV770 can't be compared as they are quite different in the way their internal structure is build up. On RV770 the shader SIMD cores and the TMU units (quads) are tied to each other, but on RV670 this was not the case and the TMU units where shared between shader unit clusters from all 4 SIMDs. Also the option with 12 SIMD units and 14 modules is not really feasible as far as I know, because you should be able to divide it by 4 as the SIMD unit has to work on pixel quads. I'm not really sure about though, but all their current design only have 8 or 16 modules per SIMD and I don't think they'll deviate from that (so we can also scrap the 6 SIMD version). Unless this is a completely new chip and that doesn't seem to be the case.

To me it all looks to be fake, although I don't think AMD won't release anything in Q1 of 2009. My guess is that we might see RV740 before the end of Q1.

[Boissez]

RV670

4 SIMD cores * 16 modules * 5 Alus (4+1) = 320 sp
4 TMU per SIMD unit = 16 TMUs

RV770

10 SIMD cores * 16 modules * 5 Alus (4+1) = 800 sp
4 TMU per SIMD unit = 40 TMUs

RV775 ???

12 SIMD cores * 14 modules * 5 Alus (4+1) = 840 sp
4 TMU per SIMD unit = 48 TMUs

or

6 SIMD cores * 28 modules * 5 five Alus (4+1) = 840 sp
8 TMU per SIMD unit = 48 TMUs

I think is fake cause the 512MB doesn´t look good but the math is doable. I don´t know much about GPU´s and their internal structures and how they work but maybe if RV775 is true is just a rearrengement of this structures too make it easier to program and to make it more efficient.

If (big if) those rumours are true I would guess that ATI would choose to add more regular ALU's to each stream processing unit (let's say 6 instead of 4) the math would then be something like:
12 SIMD cores*10 modules*7 ALUs(6+1)= 840SP

We'd a get larger but simpler SPU's giving a smaller footprint and clocking higher - makes sense no?

[Face]

.. http://www.theinquirer.net/inquirer/...oming-soon-ish

[Mats]

Shintai: Yeah you're right, didnt read the whole test setup.

[Stukov]

Shintai: Yeah you're right, didnt read the whole test setup.

Oh please tell me you didnt say those words!

[Mats]

Oh please tell me you didnt say those words!

Well at least Shintai's post helped me.

[Stukov]

Well at least Shintai's post helped me.

I was being sarcastic.