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[wccf] NVIDIA GeForce Titan Features 6 GB Memory – Review Samples Already Shipped - Page 61  

post #601 of 1002
Quote:
Originally Posted by brettjv View Post

Ah, I see. Well, I can only respond to what's on the page, and you were talking as though you thought the # of memory controllers wouldn't be higher on Titan vs GK104, so ... I just wanted to clear it up ... there will be 50% more memory controllers.

And I don't know where you are drawing the point your current post from ... the way I see it, the core of GK104 (esp. the cut-down version in the 670) just isn't powerful enough in general to benefit from 4GB, even in SLi (this is per the review on [H]). It would require some pretty sophisticated tests to prove whether this is due to bandwidth restrictions in the memory subsystem, or just simple raw gpu grunt (calculations, rasterizing, etc), and ttbomk those tests have really not been done ... but if you have evidence to the contrary, I'd be keen to see it thumb.gif

And I've definitely not seen the proof that going to 4GB (in and of itself) hurts the perf of GK104, at least not outside the bounds of what could be explained by differences in actual operating frequency on the core clock on the models being tested, or looser timings on the 4GB model.

AFA SLi goes, I suspect 'scaling' will be much the same as GK104 (2GB or 4GB ... again, I've not seen evidence there's a difference in terms of SLi scaling), but with the caveat that CPU bottlenecking will be even more likely to come into play than it already is (which means a pretty high likelihood outside of surround resolutions ... in part because CPU's have not been getting faster at NEARLY the rate GPU's have over the past 4 years).

1) More memory controllers doesn't necessarily improve memory addressing, the way a better architecture would. It still has the same O(n). (whatever it is for hardware).

2) Well the [H] scaling did say when over 2 gb was used, it did perform better, but only then, otherwise it was distinctly inferior. Yea, the idea for the 4gb, when i got mine was for SLI, but it proved not worth it so I'm just staying at one.

3) The 4 GB cards perform worse than reference, in the same [H] review you were referencing it was usually 6-8% worse. I am also drawing on many other posts from 4gb owners with less than satisfactory results, but no additional proof. Also, when you stress a memory controller of a CPU by adding more memory to address, it usually greatly reduces its OC potential. The memory of a GPU and CPU are different, and addressed differently, but I believe the same principals of electronics should likely hold true.

4) CPU bottleneck could seriously come into play with 2 titans, though I doubt a single one would bottleneck on the CPU. It does remain to be seen if this will be the case. But recall that the current SLI scaling is not the way it was on release, there have been serious improvements for SLI to get where it is, on anything but the top titles to whom the cards are being marketed.
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post #602 of 1002
Quote:
Originally Posted by brettjv View Post

Ah, I see. Well, I can only respond to what's on the page, and you were talking as though you thought the # of memory controllers wouldn't be higher on Titan vs GK104, so ... I just wanted to clear it up ... there will be 50% more memory controllers.

And I don't know where you are drawing the point your current post from ... the way I see it, the core of GK104 (esp. the cut-down version in the 670) just isn't powerful enough in general to benefit from 4GB, even in SLi (this is per the review on [H]). It would require some pretty sophisticated tests to prove whether this is due to bandwidth restrictions in the memory subsystem, or just simple raw gpu grunt (calculations, rasterizing, etc), and ttbomk those tests have really not been done ... but if you have evidence to the contrary, I'd be keen to see it thumb.gif

And I've definitely not seen the proof that going to 4GB (in and of itself) hurts the perf of GK104, at least not outside the bounds of what could be explained by differences in actual operating frequency on the core clock on the models being tested, or looser timings on the 4GB model.

AFA SLi goes, I suspect 'scaling' will be much the same as GK104 (2GB or 4GB ... again, I've not seen evidence there's a difference in terms of SLi scaling), but with the caveat that CPU bottlenecking will be even more likely to come into play than it already is (which means a pretty high likelihood outside of surround resolutions ... in part because CPU's have not been getting faster at NEARLY the rate GPU's have over the past 4 years).

Do you have any idea on where we would see diminishing returns on memory bandwidth (Gbps)?
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post #603 of 1002
Quote:
Originally Posted by brettjv View Post

AFA SLi goes, I suspect 'scaling' will be much the same as GK104 (2GB or 4GB ... again, I've not seen evidence there's a difference in terms of SLi scaling), but with the caveat that CPU bottlenecking will be even more likely to come into play than it already is (which means a pretty high likelihood outside of surround resolutions ... in part because CPU's have not been getting faster at NEARLY the rate GPU's have over the past 4 years).
Cpus did actually but multithreading isn't ready at all.
post #604 of 1002
Quote:
Originally Posted by maarten12100 View Post

Cpus did actually but software isn't ready for multithreading at all.

FYP.

Since I'm pretty sure that is what you meant.
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post #605 of 1002
Quote:
Originally Posted by Avonosac View Post

FYP.

Since I'm pretty sure that is what you meant.
Most games utilize only 2 cores which is more than sad when you have 16.
Cpu bottlenecks suck since the only way to resolve is upping the performance/thread
post #606 of 1002
Quote:
Originally Posted by Shiftstealth View Post

Do you have any idea on where we would see diminishing returns on memory bandwidth (Gbps)?
When the amount of data a card is able to process per second is less than the amount of data the memory controller is able to feed the card with wink.gif
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post #607 of 1002
Quote:
Originally Posted by Arni90 View Post

When the amount of data a card is able to process per second is less than the amount of data the memory controller is able to feed the card with wink.gif

To be more specific i mean for Titan with 2688 Cores at 732 Mhz.
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post #608 of 1002
Quote:
Originally Posted by Shiftstealth View Post

To be more specific i mean for Titan with 2688 Cores at 732 Mhz.
That depends on what the hardware is doing, the ROPs and TMUs can easily increase bandwidth consumption just by activating Anisotropic Filtering and Multisampling AA, not to mention doubling texture resolution increases bandwidth consumption for textures by four.
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post #609 of 1002
Quote:
Originally Posted by Arni90 View Post

That depends on what the hardware is doing, the ROPs and TMUs can easily increase bandwidth consumption just by activating Anisotropic Filtering and Multisampling AA, not to mention doubling texture resolution increases bandwidth consumption for textures by four.

I feel you are being difficult and you understand what i am asking.

Lets simplify this. For a 7970, when do you see diminishing returns on bandwidth in 3D Mark 11.
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post #610 of 1002
Quote:
Originally Posted by Shiftstealth View Post

I feel you are being difficult and you understand what i am asking.

Lets simplify this. For a 7970, when do you see diminishing returns on bandwidth in 3D Mark 11.
The only way to spot this is to measure latency on the board which we can't.
The other way is having 2 cards made one with a shallower interface for memory and one with a bigger one with the same core attached.
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