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[TPU] NVIDIA to Name GK110-based Consumer Graphics Card "GeForce Titan" - Page 70  

post #691 of 833
The problem with SLI scaling is that the entire Scalable Link Interface technology is bound by Amdahl's Law:

*edit* if you can't read the charts below then just copy it into notepad so that the lines don't wrap

SLI and crossfire work by reading in and writing out this data on a bus to the next card. One card begins execution of the next frame before the first one finishes in a pipe-like-pipe fashion (aka AFR).

Now, if you know about pipelining, you will already see the issue. Although the latency becomes more or less constant (hence the relatively smooth gameplay), there is a hefty, per-"stage" (per-GPU in this case) cost due to the non-pipelinable code - the code that must sync with the previous frame. Not only is this per-GPU, but the effects quickly stack up as I will give an example below.

Really quickly, the reason why SLI scales better over generations is because they optimize the drivers to group the cross-frame data passes together so that the initialization interval of frames is reduced.

key:
.... = idle time
+++ = cross-frame data computation time (serial code)
=== = pipelinable code
sss = SLI sync
| = present buffer (show frame)

GPU1: frame1+++++++++++sss==============================|sssframe3+++++++++++sss=======================|.......................sss
GPU2: idle..................................sss frame2+++++++++++============sss===========|...............sssframe4++++++++====================sssframe5

GPU1: frame1+++++++++++sss================|......................................................................................................sssframe5++++.
GPU2: idle..................................sss frame2+++++++++++sss============|....................................................................................................
GPU3: idle...................................................................................sss frame3+++++++++++sss============sss===========|...............................
GPU4: idle....................................................................................................................................sss frame4+++++++++++sss============sss===========|...............................


notice that in this example where a good portion of the code is serial you can only get like 20% better performance from 4-way SLI over 2-way.

In real life this is an extreme example, but do another example with maybe 70% less '+'s and you will have a pretty realistic modern game pattern. You will find that scalability is pretty disappointing due to Amdahl's law :C

I recommend no more than 2-way SLI + dedicated physics card. also - a dual gpu card counts as 2-way sli already so don't get tricked!

-texcoord3-
Edited by texcoord3 - 1/25/13 at 8:54pm
post #692 of 833
Must not buy... must ignore.
 
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post #693 of 833
Quote:
Originally Posted by supermi View Post

This same thing has got me SERIOSLY thinking about selling my 4 classifieds and evbots and get 2 of these (maybe 3 hehehe)

Better sell now while you can still get a decent price, longer you wait the less they will be worth. tongue.gif

Why did you buy 4 classifieds, don't they keep up with your resolution? If it were me I'd get your money out of the classifieds even if you have plenty why waste it unless your going to actually use it, 3x680's do a fine job at 2560x1600 I could actually get by with just sli and still max the graphics..
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post #694 of 833
Quote:
Originally Posted by supermi View Post

This same thing has got me SERIOSLY thinking about selling my 4 classifieds and evbots and get 2 of these (maybe 3 hehehe)
Whats up Supermi! I like the way you are thinking thumb.gif
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post #695 of 833
Quote:
Originally Posted by USFORCES View Post

Better sell now while you can still get a decent price, longer you wait the less they will be worth. tongue.gif

Why did you buy 4 classifieds, don't they keep up with your resolution? If it were me I'd get your money out of the classifieds even if you have plenty why waste it unless your going to actually use it, 3x680's do a fine job at 2560x1600 I could actually get by with just sli and still max the graphics..

Yes if I sell I will sell soon, if not I will wait till maxwell and have fun playing with voltage smile.gif

I run 3d surround and that is TAXING some games like BF3 are trouble with 4 gpus and surround, but other games like max payne 3 and borderlands 2 pretty much max out the gpu's and let me push every game setting to MAX in 3d surround which is SWEET!!!
Quote:
Originally Posted by Swolern View Post

Whats up Supermi! I like the way you are thinking thumb.gif

Hey man smile.gif I think we have similar ideas on this!!! Though I am running a 35% or so OC over a stock 680 these new gpu's better be SMOKING or 2 still won't cut it and 3 is pricey,

I really am on the edge of this gamble ... but MAXWELL next year FOR SURE!!!!!

If I knew these Titans had voltage control I would NOT hesitate but well NVIDIA makes me doubt that with their current policy trends!
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post #696 of 833
Quote:
Originally Posted by supermi View Post


If I knew these Titans had voltage control I would NOT hesitate but well NVIDIA makes me doubt that with their current policy trends!

I haven't played with Nvidia cards in awhile, but I did read about the BS they pulled. Can't a modded card BIOS fix this?
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post #697 of 833
Quote:
Originally Posted by dave12 View Post

I haven't played with Nvidia cards in awhile, but I did read about the BS they pulled. Can't a modded card BIOS fix this?

NO
    
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post #698 of 833
Quote:
Originally Posted by dave12 View Post

I haven't played with Nvidia cards in awhile, but I did read about the BS they pulled. Can't a modded card BIOS fix this?

It depends on how the card is constructed.

Take the 680 Lightning which has a custom board that can take advantage of alterations to the BIOS and the right software to give access to voltages.

Or take the 680 Classified which took a different approach, they new NVIDIA was not ok with giving people a software ability to control the voltage so they made their custom board able to connect to another device EVGA sells called the EVBOT which has hardware control of the voltages.

Then look at the reference boards which have neither the ability to software or hardware or BIOS change the voltage ... well technically you can flash the BIOS to give a TINY TINY bit more voltage ... and on top of that should you hard mod the card the VRM's can not take too much because it was not designed for this.

To combat the efforts of custom board makers like MSI and EVGA, NVIDIA forced them to stop allowing customers to control the voltage.

For the 680 Lightning that meant that all future lightnings had a voltage locked BIOS (which can be flashed) and all revisions of MSI afterburner after 2.2.3 I believe were locked, now yes you can find that version of MSI afterburner to download or change some config files in the newer afterburners but it is still possible ATM.

The classifieds well NVIDIA forced EVGA to remove the EVBOT connector... so there is no way to put more voltage (well you can flash a bios that gives the same voltage as the flashed stock cards) and if you find the connector used on line you could solder it on yourself.

Reference 680's well they are the same as before ... you can get up to 1.21v but that is a FAR cry from the 1.37v the lightnings or Classifieds can push (more for the lightnings with a few fun hacks to afterburner (with a third party program).

Not if these Titans ARE in fact reference boards and I believe i have read in this thread that WILL be the case as it was with the 690's then we do not know how BEEFY NVIDIA will make the power supply ... and like the 680 reference boards the components used as well as the BIOS itself and hard ware level set limits there is likely no way of getting the kind of voltage you can get with the likes of a Lightning or Classified (which there will not be for the Titan.

So if the Titan is say 50% faster than the 680 (random number) but with enough voltage could be 80% faster (again randomly chosen number), it is not likely we will have access to the kind of voltages needed (unless we are doing Kingpin style modding wink.gif )

Which is the major reason I might keep the Classifieds as the Titans very possibly will not give us access to the JUICE that feeds the MONSTER! thumb.gif
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post #699 of 833
Quote:
Originally Posted by Rubers View Post

It's definitely a revision of Kepler (with more SMX's, a bigger bus, etc) but not a refresh. G80 to G92 was a refresh. Same bus, same clocks, just a smaller fab

This Kepler refresh you speak of is for OEM partners, GK110 die is a lot bigger than GK104! GK110 has never been released, therefore it can't be a refresh! When Nvidia had yield issues GK110 was put on the back burner.
post #700 of 833
Quote:
Originally Posted by TheBlademaster01 View Post

At least planes don't have bad and drunk drivers, you actually get a capable and well behaved pilot rolleyes.gif

Uhhhhh.....

http://www.usatoday.com/story/todayinthesky/2013/01/04/american-eagle-drunk-pilot/1809957/
http://travel.aol.co.uk/2012/08/06/drunk-airline-pilot-qantas-flight/

biggrin.gif
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