April 20th, 2012, 11:37 PM #1
If I was to run 2 gtx460 superoverclocked in SLI would i get twice the clock speed and shader cores and data streamers or would it still only be the same speed as just one card and i do have 2 x16 slots.
This has been probably asked in here before.
April 20th, 2012, 11:45 PM #2
I don't know about clock speed, or Shader cores, but yes, and no.
If the game is optimized, for SLI, and more and more are, you could get like a 90%, or maybe even higher increase, in performance.
If the game is not optimized, for SLI, it will be the same as playing on 1 cardHard Sayin Not Knowin
April 20th, 2012, 11:50 PM #3
Oh, and AFAIK, you can't saturate 2-8X slots yet.
make that 2-16Xslots running @ 8X
Last edited by stroyal; April 20th, 2012 at 11:55 PM.Hard Sayin Not Knowin
April 21st, 2012, 01:16 AM #4
you can, just not with those cards, saturate the bus that is. If not, you will soon, with dual GPU versions of newer and next gen cards in the next year or so.
as to how it runs, yes and no, technically on paper yes you double everything.
how it works, no... you still would be technically 1GB of memory, total. As far as the frame buffer goes.
The way SLI works is one card processes one frame the other the next and so on. you can set the Prefetch for up to I think 3 frames, which is basically a buffer for storing and preparing data for up to 3 frames ahead to increase frame rates, but then that takes away from CPU resources and consumes storage resources as well (RAM, GPU RAM etc).
Think of it like a V8 engine, one bank of cylinders drives the right side wheel, the 2nd bank of cylinders drives the left...
which would be similar to the 2nd method of SLI that can be implemented where one card draws one half of the screen for every frame, and the other the other half.
Or all 8 cylinders drive both wheels at same time, but one bank of 4 cylinders fires and drives them, and then the other 4 fire and drives them, back and forth like that, which would be similar to the primary method of SLI used.
Your horsepower is the same in both methods, just different in how it operates.
now of course take away one bank of cylinders and you only have four, which would need to run to drive both wheels, and you would have half the horse power and such... how ever RPM's wouldn't be different, it would still run at same RPM, you just won't be able to drive as fast.
If any of that makes sense.
Basically, SLI doesn't really double your GPU specs per say, its like when Dual core CPU's first came out, people were adding up the clock speeds for both cores and saying such and such CPU runs at 5GHz or 6GHz, when it only ran at 2.5 or 3GHz...
its along the same lines as that, its double on paper but you can't add them together and say its double.
processed data wise, yes its double, but hardware wise, as far as clock speeds go, no.
same with shader cores, yeah, you could say, if a card had say 512 Cores, that with 2 you have 1024 core. but its still only 512 cores, just that it only renders half as many frames as it did before when in SLI.
its confusing, but makes sense.
as to performance increase, even if the game is optimized for SLI, your actual increase could be all over the board...
driver versions, directX version, game, game settings, resolution, etc etc.
all comes into play in your end result.
you could get a meager 25% boost, or you could end up with a full 100%.
most of the time from reviews I've seen a 50% boost could be expected at some resolutions, how ever 30-ish % seems to be around average.
on the plus side, SLI now, Scales much better than it used to be, for increases in frame rate being maintained from going from one resolution to higher ones.
So for example if there was a 50% boost at 1024x768, there should be a 50% all the way up to 1920x1080 or so, maybe 40-45% by the time you get that high.
in past that scaling wasn't all that great.
Triple SLI has gotten better over the years as well, but you start to see diminishing returns with it, and Quad SLI hasn't really optimized yet at all, except really hungry games with really high resolutions maybe.
same can be said of Crossfire for Radeon cards.
Triple SLI would be nice if one could afford it, had the space and slots for it, and power for it, but with the diminishing returns on average, unless you can get a good deal on the 2nd and 3rd or at least the 3rd card, its really not worth it yet IMO.
those 3 and 4 card setups are mainly for people with money to burn.i7 940//Corsair H60//EVGA X58 SLI LE//6GB Corsair Vengeance 1600MHz//2x EVGA GTX 560 Ti FPB SLI//NZXT Hale82 850W//CM 690 II Advanced//Win7 64//WD 74GB V-raptor, 750GB Black, 1.5TB Green
TechIMO Folding@home Team #111 - Crunching for the cure!
April 21st, 2012, 09:50 AM #5
That's what I meant.Hard Sayin Not Knowin
April 28th, 2012, 02:49 AM #6
Thanks guys for clearing it up for me....i just remembered i posted in here...ahhh senior moments...lol
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