AMD Cayman info (or rumor)

[saaya]

Not really Saaya its 4d shaders therefore its 480x4 for Cayman vs 320x5 for Cypress = 50% increase.

I would estimate performance will be around 40% higher on average with even more notable differences in tesselation intensive benchmarks.

why estimate if the 6000 series is already out and has been benched by dozens of sites? compare reviews and you will see that sp for sp the 6000 series is ~10% faster than the 5000 series.

Well can't say if this slide is fake or not, but I guess you completely overlooked 50% more SIMD engines than HD5870 and double poly/clock.

On paper at least it should eat GTX580 alive.

i dont know how much the increase in poly/clock will help... but i doubt itll help much besides in tesselation benchmarks and new games that come out in 2011... and there itll only matter with high tesselation settings and i have yet to see a game or let alone demo where tesselation actually makes me want to upgrade :P
sure, it MIGHT be faster than the 580, but from what ive seen so far, theres nothing hinting at it... if the 1920sp number is true, it will trade blows with the 580 at best, and probably be a tad slower.

You didn't read about Barts or you're ignoring it.
Barts 6870: 1120SP with full efficiency
Cypress 5870: 1600SP but only 1280SP being used most of the time
Cayman is not a 5D thing. Let's make a guess

Cypress 5870: 1280SP effectively used
Cayman 6870: 1920SP fully used (or 2400SP if we apply Cypress SP inefficiency)

lets make a guess... OR... OOOOORRR we look at real world benchmarks
go and continue doing your 4d 5d math all you want, actual performance boost of 4d over 5d is around 10%, sp for sp at the same clock

You disappoint me.

which means you have high expectations and think a lot of me? thanks
i shant be dissapointing you

Try not just counting on SPs amount, but also the SIMDs. Not saying that AMD mArch has been limited in math calculating or shader power, but with this quite revolutionized, new mArch, it might offer better utilization & upped efficiency compared to the current one applied in Evergreen family & Barts chips.

revolutionized? so far it sounds more like a tweaked rv800?

Say 30 SIMDs are divided into 2 "GPC", each with its own setup & rasteriser engine, then each "GPC" with 15 SIMD will be divided into 3 arrays of 5 SIMDs. Each array has 16 TMUs totalling 48 TMUs/"GPC". As a whole, 2 "GPC" with 48 TMUs each will make a 96 TMUs chip. Just a very, very raw speculation of mine, please don't take it too seriously.

why would they only do that for the 6900 series though and not 6800? sure, 6900 might be a different arch, but... that would be a bit weird wouldnt it? would be cool, but its more wishful thinking and looking for a reason HOW the 6900 could beat the 580 if you ask me :P

id love it... i just dont think its very realistic

Also, Nvidia is apparently readying a dual GF100 card, so AMD will be facing competition.

dual gpu card formula:
if ( perf/W perfMAX - perf/W perfMIN ) > ( perf/W SLI - perf/W single) release

basically, if you can get more perf out of 300W by using 2 gpus, then yeah... but sli doesnt scale that well, so using two gpus is always slower than using one gpu at higher clocks.