04-08-2016, 02:44 AM
Ok, let's compare factory specs to factory specs then:
Titan X - 3072 * 1215000000 = 3732480000000
Tesla P100 - 3584 * 1480000000 = 5304320000000
5304320000000 / 3732480000000 * 100 =~ 142.11
So 42% faster, stock vs. stock. Pretty much splits the difference between your 75% estimate and my 16% estimate. BUT...
If we're already at 300W at 1480 Mhz with 256 cores disabled, then there's zero room for overclocking assuming this has a 25A power feed (kind of hard to tell since it's not a standard PCI-e card, and I don't know anything about this proprietary connector.) We can reasonably assume though that the GTX variant will have 6pin + 8pin power which means it will not be able to draw more than 300W without violating the PCI-e spec (and Nvidia is not AMD, so that won't happen.) So if the 300W TDP for this chip is accurate, the GTX variant will have zero overclocking potential unless it has 2x 8pin power.
And there's another problem as well: 300W TDP is a big deal since the Tyan FT77, Supermicro 7048GR-TF, etc. cannot accept GPUs with TDP > 300W. So even if the card does have 2x 8pin instead of 8pin+6pin, it won't make any difference in dense enterprise applications (which is obviously what I care about), we'll have to do everything we can to keep power consumption < 300W. That means absolutely no overclocking, and possibly even downclocking like we do with the R9 290X.
So if we have a GTX variant of this chip that pulls 300W at 1480 Mhz, and the Titan X can overclock nicely up to 1515 Mhz without overvolting and without drawing > 300W, then the real-world picture is quite a bit different:
Titan X - 3072 * 1515000000 = 4654080000000
Tesla P100 - 3584 * 1480000000 = 5304320000000
5304320000000 / 4654080000000 * 100 = 113.97
That's only 14% faster in the real world.
Now maybe the GTX variant with 3584 cores doesn't draw 300W since it likely wont have all the FP64 cores the Tesla has. So maybe it only draws like 250W and there is indeed some overclocking potential. We'll have to wait and see. But that still leaves doubts about how much power the chip will draw when all the cores are enabled.
Anyway, my point is, you have to take all the factors into consideration. I'm analyzing the big picture here, not just what's immediately on paper.
Titan X - 3072 * 1215000000 = 3732480000000
Tesla P100 - 3584 * 1480000000 = 5304320000000
5304320000000 / 3732480000000 * 100 =~ 142.11
So 42% faster, stock vs. stock. Pretty much splits the difference between your 75% estimate and my 16% estimate. BUT...
If we're already at 300W at 1480 Mhz with 256 cores disabled, then there's zero room for overclocking assuming this has a 25A power feed (kind of hard to tell since it's not a standard PCI-e card, and I don't know anything about this proprietary connector.) We can reasonably assume though that the GTX variant will have 6pin + 8pin power which means it will not be able to draw more than 300W without violating the PCI-e spec (and Nvidia is not AMD, so that won't happen.) So if the 300W TDP for this chip is accurate, the GTX variant will have zero overclocking potential unless it has 2x 8pin power.
And there's another problem as well: 300W TDP is a big deal since the Tyan FT77, Supermicro 7048GR-TF, etc. cannot accept GPUs with TDP > 300W. So even if the card does have 2x 8pin instead of 8pin+6pin, it won't make any difference in dense enterprise applications (which is obviously what I care about), we'll have to do everything we can to keep power consumption < 300W. That means absolutely no overclocking, and possibly even downclocking like we do with the R9 290X.
So if we have a GTX variant of this chip that pulls 300W at 1480 Mhz, and the Titan X can overclock nicely up to 1515 Mhz without overvolting and without drawing > 300W, then the real-world picture is quite a bit different:
Titan X - 3072 * 1515000000 = 4654080000000
Tesla P100 - 3584 * 1480000000 = 5304320000000
5304320000000 / 4654080000000 * 100 = 113.97
That's only 14% faster in the real world.
Now maybe the GTX variant with 3584 cores doesn't draw 300W since it likely wont have all the FP64 cores the Tesla has. So maybe it only draws like 250W and there is indeed some overclocking potential. We'll have to wait and see. But that still leaves doubts about how much power the chip will draw when all the cores are enabled.
Anyway, my point is, you have to take all the factors into consideration. I'm analyzing the big picture here, not just what's immediately on paper.