Thanks a lot, Ross, that really helped a lot!
I cannot wait to see you real-life, more trustable benchmark results with
the GTX Titan and Amber12. I will make a final decision then, but now is 99%
in favor of the GTX 680s.
Due to technical reasons, we cannot use more than 700W power supplies, so we
usually put 2 GTX n80 in a AMD-based linux box.
Best regards,
Gonzalo
-----Mensaje original-----
From: Ross Walker
Sent: Thursday, February 28, 2013 12:10 AM
To: AMBER Mailing List
Subject: Re: [AMBER] GTX 680 vs GTX Titan
>Dear all,
>
>We are going to expand our GTX 580-based cluster and we were thinking
>about buying the Œold¹ GTX 680¹s, but it seems that the Titans are going
>to be unleashed soon, and you guys are talking really good things about
>them... We need to spend the money pretty soon, so my questions are:
>
>- Is there any chance that we can buy affordable GTX Titans in the next 2
>weeks or so?
Unfortunately I have to say the answer is no.
>- Which models do you guys recommend?
For GTX680 probably the following EVGA card will give you the best in
terms of stability and performance. In my experience the eVGA cards tend
to be pretty solid.
http://tinyurl.com/d82lq8d
These are $549 each plus tax. You can get over clocked versions as well
like the + version of the above or the classified version but they tend to
cost more money for only a fractional percentage improvement in speed.
>- Which is the expected price for one of these things? Is it worth
>compared to GTX 680?
For the GTX-Titan - Between $999 and $1199 + tax. So just under double the
price of a GTX680. Right now I am still waiting on access from NVIDIA. I
hope to have real benchmarks in a couple of days but we estimate about 115
to 120ns/day for the JAC NVE benchmark. Compared with around 72.5ns/day
for the GTX680. You can put 4 of either in a standard box (with a 1400W+
power supply) so you really just need to do the math on whether it is
worth it for you. It is hard to estimate the value of being able to run a
single simulation faster since peoples opinions differ wildly on this.
Just look at people buying Intel chips. They'll pay 150% more in price for
a 4.3% boost in clock speed. CRAZY! But yes 120ns/day on 1 card would be
nice. The other thing of course is whether the GTX680 price will come down
with wide availability of the GTX-Titan. I don't know the answer to that
but previous experience with NVIDIA graphics cards suggests that is
unlikely it will just slowly get phased out. The GTX-Titan price probably
will come with time though but it will quite a while.
So I guess if you have to spend the money in 2 weeks then GTX680 is really
your only option (690 is the same price as the Titan). If you can wait 6
weeks or so then it is a coin toss between the 680 and the titan depending
on how many nodes you have to put these cards in. Also note that right now
the Titan is an unknown quantity since we haven't actually had a chance to
run on a real one yet.
Hope that helps
All the best
Ross
/\
\/
|\oss Walker
---------------------------------------------------------
| Assistant Research Professor |
| San Diego Supercomputer Center |
| Adjunct Assistant Professor |
| Dept. of Chemistry and Biochemistry |
| University of California San Diego |
| NVIDIA Fellow |
|
http://www.rosswalker.co.uk |
http://www.wmd-lab.org |
| Tel: +1 858 822 0854 | EMail:- ross.rosswalker.co.uk |
---------------------------------------------------------
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Received on Thu Feb 28 2013 - 01:00:02 PST
