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NVIDIA GK110 "Titan" Performance Analysis - Page 5

post #41 of 71
I wonder if this really is going to be a real "gaming card" like the GTX line-up is, or something between a prof vid.ed. card and a gaming card. Since everybody allways screems the tesla cards are no good for gaming and now it seems like the Titan is moving a bit towards a tesla card. Or so it seems to me..
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post #42 of 71
Quote:
Originally Posted by Booty Warrior View Post

Well, yeah. That's the point myself and box were making actually.
I was refuting those ideas specifically because they are implicit in the notion of doubling bus width. A gpu with a 512 bit memory interface is capable of 512 bit data transfers to and from a single memory pool, which isn't the case in SLI. Obviously this isn't news to you, but apparently Zal didn't understand the difference.

Anyway that little OT convo about SLI was over days ago, Brett. tongue.gif

On-topic: If those benches turn out to be real, and the 700 series really is pushed back to Q4 (ugh) I might actually go for this. I'm getting the upgrade itch reeeeeeal bad frown.gif

The guy said plenty of things to convince me that he knew exactly what he was talking about/how SLi actually operates, and nowhere did he say double (i.e. there's no single connection that's 512-bit) BUS width ... he said the CARD has double the BANDwidth. They're not the same thing, and for the purposes of calculation/comparison to a single GPU card, it's much more accurate to use 384 in your calcs than 192. The refutation of this (quite valid) point was what started the whole debate amongst you. Anyway, since it was more or less OT, and apparently 'over' since he stopped responding to you two ...
Edited by brettjv - 2/2/13 at 7:30am
    
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post #43 of 71
Quote:
Originally Posted by Booty Warrior View Post

Well, yeah. That's the point myself and box were making actually.
I was refuting those ideas specifically because they are implicit in the notion of doubling bus width. A gpu with a 512 bit memory interface is capable of 512 bit data transfers to and from a single memory pool, which isn't the case in SLI. Obviously this isn't news to you, but apparently Zal didn't understand the difference.
Now you people are just making stuff up just for the sake of argument.

There are two GPUs, each one with a completely independent 256-bit, 192GB/s access to its own set of VRAM. Since it is completely independent, the total bandwidth is effectively doubled.
Now, the efficiency of this approach, and whether they read and write similar (redundant) stuff is a completely different thing.
We are not talking bus width, either, we are talking bandwidth, which is measured in GB/s. We have two GPUs simultaneously reading and writing in their VRAM buffers all the time.

No single chip has access to double the bandwidth (same as for twice as many cores for that matter), but since there are two of them, time between frame refreshes is essentially halved, because by the time the first GPU is done with the first frame (if we are talking about AFR), the second GPU should be half way there with the second one.

In fact, in SFR mode, given that the top half of the screen is completely different from the bottom half of the screen (unrealistic scenario, but we are not talking about efficiency here), it would indeed pretty much act (not be) as a chip with double the cores and double the bus/bandwidth. But in reality it's not the case, of course, which is why AFR is more efficient (but with added latency issues).
Quote:
Originally Posted by brettjv View Post

Anyway, since it was more or less OT, and apparently 'over' since he stopped responding to you two ...
It's over for me, I will not be wasting time in an attempt to make myself clear another time.
Edited by zalbard - 2/2/13 at 7:37am
post #44 of 71
Quote:
Originally Posted by zalbard View Post

Now you people are just making stuff up just for the sake of argument.

There are two GPUs, each one with a completely independent 256-bit, 192GB/s access to its own set of VRAM. Since it is completely independent, the total bandwidth is effectively doubled.
Now, the efficiency of this approach, and whether they read and write similar (redundant) stuff is a completely different thing.
We are not talking bus width, either, we are talking bandwidth, which is measured in GB/s. We have two GPUs simultaneously reading and writing in their VRAM buffers all the time.

No single chip has access to double the bandwidth (same as for twice as many cores for that matter), but since there are two of them, time between frame refreshes is essentially halved, because by the time the first GPU is done with the first frame (if we are talking about AFR), the second GPU should be half way there with the second one.

In fact, in SFR mode, given that the top half of the screen is completely different from the bottom half of the screen (unrealistic scenario, but we are not talking about efficiency here), it would indeed pretty much act (not be) as a chip with double the cores and double the bus/bandwidth. But in reality it's not the case, of course, which is why AFR is more efficient (but with added latency issues).
It's over for me, I will not be wasting time in an attempt to make myself clear another time.

Well, you just kinda did tongue.gif

I was just trying to diffuse the situation here, so you guys can get back on track (using your considerable collective mathematical prowess) on figuring out how badass this thing is going to be ... or not thumb.gif
Edited by brettjv - 2/2/13 at 7:40am
    
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post #45 of 71
Quote:
Originally Posted by brettjv View Post

...on figuring out how badass this thing is going to be ... or not thumb.gif
Thats all we're interested in wink.gif
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post #46 of 71
Quote:
Originally Posted by brettjv View Post

I was just trying to diffuse the situation here, so you guys can get back on track (using your considerable collective mathematical prowess) on figuring out how badass this thing is going to be ... or not thumb.gif

This! thumb.gif
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post #47 of 71
Quote:
Originally Posted by brettjv View Post

Well, you just kinda did tongue.gif
I meant after that post of mine.
Quote:
Originally Posted by brettjv View Post

I was just trying to diffuse the situation here, so you guys can get back on track (using your considerable collective mathematical prowess) on figuring out how badass this thing is going to be ... or not thumb.gif
thumb.gif

Anything GK110 based is going to be awesome. Whether it's going to be faster than GTX 690, or worth the money at all, is yet to be seen. tongue.gif
We need more info.

What I'm really hoping for is that Nvidia does not save up on VRM. Would be nice to see another rock solid and powerful card that does not sweat (or explode tongue.gif) after overclocking.
post #48 of 71
It won't have an adjustable voltage, so I wouldn't be surprised if they cheap-out on the VRMs.
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post #49 of 71
Quote:
Originally Posted by dph314 View Post

It won't have an adjustable voltage, so I wouldn't doubt if they cheap-out on the VRMs.
Neither did GTX 690, and they build it pretty well. I recall them saying that they would stop cheaping out on high-end cards.
Besides, there is a slight chance that it may be voltage unlocked. smile.gif
post #50 of 71
Quote:
Originally Posted by brettjv View Post

The guy said plenty of things to convince me that he knew exactly what he was talking about/how SLi actually operates, and nowhere did he say double (i.e. there's no single connection that's 512-bit) BUS width ... he said the CARD has double the BANDwidth.
Oh come on Brett, how was he doubling said BANDwidth? We're not talking about multiplying memory speeds here. He was adding the specs of both cards together (without accounting for data redundancy) and then using percentage multipliers to reach a fallacious conclusion on how powerful GK110 would be. Don't make it out as if I'm splitting hairs here, I was simply correcting him when he went off on his tangent... rolleyes.gif

What even needed diffusing?
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