GTX 780 TI

[kracker]

Originally Posted by TheMawn

I have no idea where you're finding $50 - $100 GTX 580's. I know there are many who would upgrade from a 580 to a 670 or a 570 to a 660 Ti in a heartbeat, but even $100 isn't going to get you very far.

Yes, getting a 580 quite cheap. You just have to look in the right places. (kladner)

[kladner]

Originally Posted by kracker

Yes, getting a 580 quite cheap. You just have to look in the right places. (kladner)

My 580 came off Ebay, but it was quite a bargain at $165, shipping included. I think the seller put off potential buyers with his description. He had apparently run the card without the bracket. While he reattached the bracket, he did not locate the studs for attaching the video cables. I still haven't replaced them, as they aren't absolutely critical. I just happened to be at the right place at the right time to pick up on an auction with no bids, and win it with one bid. The seller was a good sport about it, but he was pretty disappointed by the price he got.

[Manpowre]

I have 2x 580s in my analogue mail at postoffice ready to be picked up, they are a little more expencive in Norway, but, I paid 100usd for each..

The 2x 590 boards I bought earlier, I got for 175usd each. but that was before 290x came to market.. so price was still a little higher (late summer)

[ET_]

Does James read this thread?

I'm also curious about the benchark of 780 Ti being better than Titan's and GTX 580's...

Luigi

[Jayder]

Originally Posted by Manpowre

I have 2x 580s in my analogue mail at postoffice ready to be picked up, they are a little more expencive in Norway, but, I paid 100usd for each..

The 2x 590 boards I bought earlier, I got for 175usd each. but that was before 290x came to market.. so price was still a little higher (late summer)

Where are you buying your boards? The prices on ebay seem to be about $130-$200 for a 580 and about $300-$450 for a 590 before taxes and shipping.

[Manpowre]

Originally Posted by Jayder

Where are you buying your boards? The prices on ebay seem to be about $130-$200 for a 580 and about $300-$450 for a 590 before taxes and shipping.

Local marketplace for norway. I dont think people here will be interested sending out of country. In norway there is use and throw mentality. So once 1-2 generations hardware is there the prices drop. Now with 290x it dropped even more..

[TheMawn]

I think the 780 Ti wins by brute force. I don't care if your Prius is more efficient, my semi has more power.

[kracker]

Originally Posted by TheMawn

I think the 780 Ti wins by brute force. I don't care if your Prius is more efficient, my semi has more power.

What do you mean? a 780 Ti is NOT faster than a Titan in CuLu.

[axn]

Originally Posted by kracker

What do you mean? a 780 Ti is NOT faster than a Titan in CuLu.

But that is what the numbers from James' site is implying (as highlighted by LaurV's posts). See http://www.mersenne.ca/cudalucas.php?model=508.

However, having re-reviewed the numbers, I think that the Titan numbers there might've been obtained without enabling the full speed DP option of Titan (as specified @ http://hothardware.com/Reviews/GeFor...sis-3/?page=15). In that case, the 780 Ti numbers are legit, but the Titan's could be lot faster.

EDIT:- Maybe this thread should be moved under "GPU Computing"?

[LaurV]

Originally Posted by kracker

What do you mean? a 780 Ti is NOT faster than a Titan in CuLu.

Well, according with this, it is. And MUCH. That is why all the discussion I started with this post (read carefully the continuation). Still unclear if the data is correct, and if James reads those posts. For me, the data still look fabricated, someone (new kid) with a new Ti toy, and boasting on the web. I may be wrong. This (see axn's post #26) is easy to test, if one has a Titan, if the memory is indeed the limitation, one can feed the Titan (first test case) one BIG-LL test (say 65M expo), or (second test case) with two small-LL tests (say 2x 33M expos) in parallel. Due to memory limitation, part of the FP64 power will not be used in the first case, but the second case would have about 1.4 times the memory transfers (yes, there are not two times, think about how FFT works) requirement there would be a discrepancy between the two test cases. Also, if you do (case 1) one small-LL, or (case 2) two small LLs in parallel (same expo range, say 30M), then the second test case should be about 40% more efficient than the first, i.e. you should be able to get "half of the DC" for free. It just need two cudaLucas copies in two folders, feed them to the same Titan card, and put the results here on the forum, for both test cases. Then we will dissect them.

I mean, c'mon! the Titan has ~6 times more FP64 power (1/3 instead of 1/24, but lower clock and ~10% less cuda cores), if the memory speed is indeed the limit, than it would mean cudaLucas can be rewritten to access the memory less, and we would have a 6-times faster LL test. Doing 65M LL tests in 12 hours, instead of 72 hours, how does it sounds? (I know this is difficult-to-impossible to do due to "serial" structure of the LL test, but at least we could combine LL with some other FP64 activity which does not require so much memory access, and still have that other work for free!).

Therefore, either the results on James' page are boasted, or nVidia is lying about 1/3 vs 1/24 ratios.

Unfortunately, I didn't lay my hands on a Titan or 780Ti yet, to pluck all its feathers... But that time will come.

(edit: crosspost with axn, sorry, I oppened this to answer in the morning, but could not finish editing till the lunch break, busy time here)

[TheMawn]

Originally Posted by kracker

What do you mean? a 780 Ti is NOT faster than a Titan in CuLu.

What I meant was perhaps the 780 Ti is just so freaking much faster as a part that the Titan which is better suited still loses. Brute force vs efficiency.

I don't know much more obvious I can make the analogy.