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Differential versus Single-Ended GDDR5 by: Theo Valich on 9/27/2010
In order to address this once for all, we'll be bringing an article on GDDR5 memory types, as specified by GDDR5 Working Group and ratified by JEDEC.

Ed.
by: Anonymous on 9/25/2010
I agreed with you until I bought 2 gtx 480 in sli by EVGA. and get 95% gains in every game I throw at them. Dual gpu setup is quite mature in terms of drivers vs. Tri sli or crossfire settup (3 years old now) and quad gpu. Setup is about a year old.

I had bad experience with dual gpu setup in the past 2 gts 8800 gave me problems, then I sold those and bought one 8800 ultra that beat both 8800 gts in sli.

My recomendations is stick to a well known brand like EVGA for Nvidia, and Sappire, Diamond, and HIS.
Also go with a better perfomance single gpu vs. 2 weaker gpus in Sli, or crossfire setup. Then when prices drop more and you get more money you can double up your perfomance with a 2nd card!
And wait at least 3 to five for years for tri or quad gpu setup drivers to improve and mature.

By Dr. Kae
im with u by: Anonymous on 9/25/2010
Anonymous on 9/25/2010..Yeah i`m with you on that in that i couldn`t care less about multi gpu`s cos they`re too much hassle.I have a couple of friends that ran various combos, one ran tri sli with gtx 280s and the other ran various different ati crossfire setups and i never stop hearing of the problems they are having with game x,y or z.It never ends and im fed even listening to them about it.Thank fck i never bought into that crap.
Multi gpu scaling! by: Anonymous on 9/25/2010
These bart parts might beat the gtx 460 in single gpu fight, but everyone knows that when in multigpu settup Nvidia drivers murder the competition ( in tesselation, high resolution, and higher anti aliasing) so unsless AMD improves it Catalists, its going to loose in the multi gpu settup.

As far as no games supporting multi gpu settup at launch. Where have you bin. ( the 400 series by Nvidia gets up to 95 % gain perfomance in every game now and @ their launch) something AMD can't prove nor deliver.

By. Dr. Kae
by: Anonymous on 9/25/2010
Who gives a crap what kind of islands the name is?
Anyway I think Theo has it right: I thought Southern was 40nm refresh, and Northern 2011 28nm new architecture to compete with Kepler.
Everyone knows that's what we're talking about, any confusion is probably amd's fault for the northern and southern business.

To the guy banging on about 5970 ("IF you can find a AMD 5970 within 40% of what Nvidia wants for a 480, you should definatly go with one of those instead"):

Yeah, I just don't have any interest in dual-gpu because of all its downsides which come for $600! I'll only ever be interested in a single mega-powerful gpu.

I find there are enough issues to sort out with pc gaming without having to put up with all multi-gpu's issues like waiting for profiles and hoping there's a profile for your game, microstuttering, many games simply not supporting dual-gpu at launch, many not supporting it period, etc. There's no way in hell I would buy into all that crap for $600.
plagiarism by: Anonymous on 9/24/2010
are you copying charlie's news again?

no where has it been mentioned that amd is releasing "Southern Islands" other than at semiaccurate.com

everywhere else is saying it's northern islands.

stop copying news and stop making $hit up (like how GTX460 was 128bit but now you've changed it to 256bit).

and to the post below me, GTX460 768mb is not 128bit it's 192bit. so do FULL study before you talk out of your ass, "yo"
by: Anonymous on 9/24/2010
Someone : "GTX 460 has 256-bit yo, do some study before you talk of your ass. Also, the slide is fake"

GTX460 768MB is 128-bit yo... GTX460 1GB is 256-bit yo... do FULL study before you talk out of your ass yo.

Also, it's not proved if the slide is fake or real... unless you've some evidence nobody else has to prove otherwise, do shut up.
who cares by: Anonymous on 9/24/2010
it will take them 6 months after that to get decent drivers and then break them in the follow up.
Stop this "differential GDDR5" BS!!! by: Anonymous on 9/24/2010
Differential signaling requires 2 pads/wires to transmit 1 bit, GDDR5 has 1 pad per bit.

"Differential GDDR5" would be an entirely different memory family, so much that it wouldn't be "GDDR5" anymore.

If I remember correctly, only CLK is differential (since DDR-SDRAM btw), GDDR5 RAM having an outgoing clock in addition to the incoming one.
RE: 18th NDA lift, Event earlier... and AMD memory controller... by: Theo Valich on 9/24/2010
From what we are hearing, journalists attending the event will receive the cards at the event, after which they will have some period of time to review the boards. This was a common practice in the past and editors I spoke about expect it to continue moving on.

As far as nVidia goes, no comment (read price drops) until Fermi refresh arrives. We learned some details, but it is still too early to go out based on 2-3 sentences.

You can make sure we'll follow this very closely and report as soon as we conclude we have viable information.

Again, thanks for the feedback.

Ed.
by: Anonymous on 9/24/2010
"As for 6870, no thanks - I'm gonna get an Accelero Xtreme Plus instead, enabling a quiet 30% overclock on air of my gtx480. The card already has 15-20% at stock on 5870, and 6870 will not get anywhere near 50% up on 5870."

HD 5970 beats the 480 by about 35-40%.

Why does the 5970 beat the 480? because the 5970 is a dual GPU card. BUT it comes with less noise, less heat, less POWER draw than 1 480 card. Thats right, 1 single GPU card uses MORE power than a AMD 5970 dual GPU one, and it gets beat by a good 35-40% in performance.

IF you can find a AMD 5970 within 40% of what Nvidia wants for a 480, you should definatly go with one of those instead.
by: Anonymous on 9/24/2010
"we would not state that the board ticks at 8GT/s"

right Theo, it was not explicitly stated, but it was effectively stated (re: zotac 460 amp):

"...a memory clock of 4GHz. This is in contrast to the stock Nvidia reference clocks of 675MHz core, 1350MHz shader clock, and 1800MHz memory clock. This means that Zotac has achieved a 20% OC on the core and shader while achieving a memory overclock of 122%."

Just a mistake that got corrected, as did your own one here :)
by: Anonymous on 9/24/2010
Other sites claim October 18th as the release date. 12th might be the event though. Interesting to see what barts really is, as so far it looks like a 5830 that is going to be called 6850, which doesn't make much sense.
Memory speed by: Anonymous on 9/24/2010
Anybody knows why the memory clocks of the gf100/104 are relatively low compared to their AT..ehmm AMD counterparts?
Some time ago I read a rumor that indicated that NVIDIA had some problems with their memory controllers at the introduction of GDDR5.

If the slide is not indeed not fake and AMD will introduce a 256 bit bus for the mainstream gpus as well - then they might get an advantage at higher resolution gaming due their higher memory clock speeds.
But the shader/tmu power of NI/SI might be the bigger factor for a potential performance increase cause the current 5770/50 don't seem to have a memory bottleneck.
8000MHz Effective QDR memory? by: Theo Valich on 9/23/2010
While Differential GDDR5, if it indeed arrives on the market could have data rates which go as high as the clock you mentioned, we would not state that the board ticks at 8GT/s. Even when mentioning dual boards, we would increase the data path to "two times 256" or "512" or "256x2", for instance.

To answer the claim if the slide is fake or not, all will be unveiled on October 12, 2010. And that's all that matters.

Ed.
GTS 450 has 128-bit by: Anonymous on 9/23/2010
He probably meant to say the GTS 450 has a 128-bit memory bus. Barts Pro will be priced against the GTS 450 while Barts XT will be priced against the GTX 460. Since the GTS 450 was mediocre to begin with it doesn't look good for Nvidia on the low end.
by: Anonymous on 9/23/2010
"nVidia's 128-bit equipped GTX 460 has an issue fighting for life"

Don't you guys know anything? Recently I saw a report on here stating that some gtx400 series card was gonna have 8000mhz effective qdr memory!

As for 6870, no thanks - I'm gonna get an Accelero Xtreme Plus instead, enabling a quiet 30% overclock on air of my gtx480. The card already has 15-20% at stock on 5870, and 6870 will not get anywhere near 50% up on 5870. :)
GTX 460 has 256-bit by: Anonymous on 9/23/2010
GTX 460 has 256-bit yo, do some study before you talk of your ass. Also, the slide is fake
hmm by: Anonymous on 9/23/2010
I would have thought the new ati card would be positioned to beat gtx 480...
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