AMD: R7xx Speculation

(Deleted my post since CJ was faster.) CJ, you forgot that X800 vanilla/Pro/GT/GTO were all partially deactivated chips and might I add the Radeon X550 XT and X1650 XT.

 

Yeah, I think 4 scalars per element normally works out quite well, e.g. single precision optimised matrix multiply computes 32 scalars per invocation and the main compute loop has an average ALU utilisation of 4.4 per clock.

Multiples of 4 also works out nicely in terms of issuing TEX instructions, since each TEX clause is a maximum of 8 instructions.

Oh and this shader allocates 39 vec4s (plus 1 temporary)

Jawed

 

first time hear?! where can you buy these cards?


speaking about the mystery… what’s this card with 750 MHz GPU clock and 900MHz memory clock?

http://www.tweaktown.com/news/9691/index.html

 

=>Sunday: Just a guess, but if GDDR5 is in fact QDR instead of DDR, which it may very well be, and GPU-Z detects it like that, then 900 × 4 = 3600 MHz

 

900Mhz GDDR5 at that

 

They were limited to Asia.

Basically a Radeon HD 3800 with 128-bit memory bandwidth.

Makes sense. Wasn't the rumor that the Radeon HD 4870 was using the slowest GDDR5 at 1.800Mhz?

 

But then we have this:

http://www.extremetech.com/image_popup/0,,iid=209888&aID=228640&sID=27867,00.asp

Even the 260 is beating the GX2 here. Perhaps its down to DX10 performance. The benchmark you posted above is in DX9 while the extremetech one is DX10.

 

The 9800GX2 is getting beat or equaled in 3 out of 4 resolutions by the single 3870 there also, not sure what to make of that test.

 

Some guys over at xs.org say that the 4850 will "go live" tomorrow instead of next week. Sure, why wait?

 

Do Crysis benchmarks in High Quality or Very High Quality mode have AF enabled?

I'm surprised at the scores of the 3870 because I distinctly remember it getting creamed in 4xAA 16xAF settings a while ago.

 

If you're referring to the Techreport tests, that remains true... in the flyby.

Apparently, for in-game tests, ATI does a lot better.

 

Well, just remember that ATI cards are like a wine. They age very well with the drivers.

 

Amusing, but actually quite true. At least in my experience as a long-time Radeon owner (of several cards).

 

Those were disabled or defective ?

 

Is that pic of the "mystery" card with the Vantage score in extreme settings? or Performance settings

 

HD4850 vs HD4870 :

Xtreme preset :

HD4850 vs 4870

GT1 : 8.62 - 12.57
GT2 : 7.13 - 12.72

FT1 : 651.67 - 779.86
FT2 : 3.41 - 5.49
FT3 : 18.11 - 20.58
FT4 : 14.23 - 17.02
FT5 : 27.59 - 33.58
FT6 : 48.92 - 53.73

GPU Score : 2692 - 4316

Source : TweakTown

http://www.tweaktown.com/news/9691/index.html

From where i got the results for comparison with HD 4850 :

http://img101.imageshack.us/img101/3754/vantagextremestock2808tn4.jpg
http://img101.imageshack.us/img101/8016/vantageud4.jpg

Look at the pixel fill rate test 5.49 GP/s . More than 16 ROPs ?

 

Huh, the supposed score for the 4870 is a lot higher than the 4850

 

No, 16 ROPs with 4 Z @ >100GB/s. (RV670XT already reached 3GP/s)

 

New article on Tweaktown:

http://www.tweaktown.com/articles/1467/how_nvidia_stuffed_the_gtx_280/index.html

 

CJ, any info on 4870? Release date, perf estimates? Throw us a cookie!