mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Hardware > GPU Computing

Reply
 
Thread Tools
Old 2013-08-07, 10:05   #1
Manpowre
 
"Svein Johansen"
May 2013
Norway

3·67 Posts
Default Curtis and similar GPU build

I have noticed from 26th of june to today 7th of august Dr Curtis Cooper has checked 771 primes, probably world record prime enabled here right ?

That means about 18 numbers checked per day in average.

Lets say each Nvidia Titan can do one number in 3 days, = 3 titan cards for each number at the LL test level we are at right now. that means we need 54 cards at 1000 USD each to compete + 14 machines to host those cards (4 cards in each, with each machine cost 1500 USD). Total investment of 75 000 USD.

If we can get hold of used Nvidia 590 boards, each board does a little better than one Titan card, so around 50 590 boards or something, we can setup similar setup for 13 machines, but used 590 boards can get purchased for 250 USD each or less = 33 500 USD.

So, 13-14 machines is what it takes with the right GPU to compete with Dr Curtis Cooper using GPU's.

Interesting.
Manpowre is offline   Reply With Quote
Old 2013-08-07, 12:58   #2
ET_
Banned
 
ET_'s Avatar
 
"Luigi"
Aug 2002
Team Italia

3×1,609 Posts
Default

Quote:
Originally Posted by Manpowre View Post
I have noticed from 26th of june to today 7th of august Dr Curtis Cooper has checked 771 primes, probably world record prime enabled here right ?

That means about 18 numbers checked per day in average.

Lets say each Nvidia Titan can do one number in 3 days, = 3 titan cards for each number at the LL test level we are at right now. that means we need 54 cards at 1000 USD each to compete + 14 machines to host those cards (4 cards in each, with each machine cost 1500 USD). Total investment of 75 000 USD.

If we can get hold of used Nvidia 590 boards, each board does a little better than one Titan card, so around 50 590 boards or something, we can setup similar setup for 13 machines, but used 590 boards can get purchased for 250 USD each or less = 33 500 USD.

So, 13-14 machines is what it takes with the right GPU to compete with Dr Curtis Cooper using GPU's.

Interesting.
You forgot the heat dissipation and the energy consumption...

Luigi
ET_ is offline   Reply With Quote
Old 2013-08-07, 17:44   #3
Manpowre
 
"Svein Johansen"
May 2013
Norway

3·67 Posts
Default

Quote:
Originally Posted by ET_ View Post
You forgot the heat dissipation and the energy consumption...

Luigi
True, I didnt even want to think about it, especially with 590 boards which consumes 375w per board. hehe..
Manpowre is offline   Reply With Quote
Old 2013-08-07, 17:55   #4
kracker
 
kracker's Avatar
 
"Mr. Meeseeks"
Jan 2012
California, USA

216910 Posts
Default

Quote:
Originally Posted by Manpowre View Post
True, I didnt even want to think about it, especially with 590 boards which consumes 375w per board. hehe..
54 Titan=13500W

I have enough with my 400W med-end computer! lol
kracker is offline   Reply With Quote
Old 2013-08-07, 21:54   #5
henryzz
Just call me Henry
 
henryzz's Avatar
 
"David"
Sep 2007
Cambridge (GMT/BST)

23×739 Posts
Default

Quote:
Originally Posted by kracker View Post
54 Titan=13500W

I have enough with my 400W med-end computer! lol
With that sort of power budget I imagine you could run a fleet of around 200 low power quads(800 cores). I doubt a titan can match 16 cores(at 2 Ghz for a 4765T)
henryzz is offline   Reply With Quote
Old 2013-08-07, 22:25   #6
Primeinator
 
Primeinator's Avatar
 
"Kyle"
Feb 2005
Somewhere near M52..

3×5×61 Posts
Default

Quote:
Originally Posted by henryzz View Post
With that sort of power budget I imagine you could run a fleet of around 200 low power quads(800 cores). I doubt a titan can match 16 cores(at 2 Ghz for a 4765T)
But more difficult to store...?
Primeinator is offline   Reply With Quote
Old 2013-08-07, 23:11   #7
TheMawn
 
TheMawn's Avatar
 
May 2013
East. Always East.

110101111112 Posts
Default

I think one might be better off getting GTX 760's or something instead. Cheaper and cooler for the amount of work they would do.

Now, I know very few motherboards appreciate trying to do 4-way SLI but the cards don't have to be in SLI, so can any motherboard with 4 GPU slots (spacing permitting) run four GPUs?

Also, make sure to count the CPUs you'll be hosting as well.
TheMawn is offline   Reply With Quote
Old 2013-08-08, 05:15   #8
kladner
 
kladner's Avatar
 
"Kieren"
Jul 2011
In My Own Galaxy!

27AE16 Posts
Default

Quote:
Originally Posted by TheMawn View Post
..... can any motherboard with 4 GPU slots (spacing permitting) run four GPUs?.....
Cards which exhaust out the back instead of inside might make it. But really, that kind of rig cries out for water cooling.

Spacing is really a problem, too, as most high-end cards are double slot, at least. I think you could get three on my board, but keeping two dump-heat-inside cards cool is already a challenge. The fourth slot is too close to a bottom-mount CPU in a mid-tower case to put a dual-slot card in.

Then there's this. "Solution for those who has the desire"(SIC!) (and whose children is learning!) Note photo of 4x GTX 480 cards in SLI. Kind of dates it, eh? (Diesel generator not included.)

Last fiddled with by kladner on 2013-08-08 at 05:22
kladner is offline   Reply With Quote
Old 2013-08-08, 06:25   #9
LaurV
Romulan Interpreter
 
LaurV's Avatar
 
Jun 2011
Thailand

24×13×47 Posts
Default

Quote:
Originally Posted by TheMawn View Post
...the cards don't have to be in SLI, so can any motherboard with 4 GPU slots (spacing permitting) run four GPUs?
Yes, if it has 4 pcie slots, with enough space between. Unfortunately a good GPU takes over 2 slots ("over" like in "more than", not like in "to take over", they are usually 2.4, 2.6, 2.8 slots, air cooled, and this especially for Asus cards, their DCII line, etc), and there are not so many mobos around to accommodate the space of 12 slots in 4 connectors. You need to go water cooling for that.

Edit: about the ROG expander: Don't buy it! It even doesn't work with their own cards, all are more than x2 wide! In fact, the last photo from that gallery is the stupidest thing I saw in a long-long time: the mobo they used in the photo has already 4 slots, which you can't use because you placed the expander on top of them, which expander, of course, has just 4 slots too... (placed at the same distance between each other )

This photo reminds me of the RS232 "gender exchangers": that was a piece of cable about 10-15 cm long, with 9-pin D-Sub connectors at both sides, the idea was that if you have a "male" connector, you plug the "gender exchanger" into it, and you have a "female". Or viceversa. Of course, they were delivered in both "crossing" and "non-crossing" - who knows the serial protocol of exchanging Tx and Rx wires, knows what I am talking about - some serial cables you buy from the shop are crossed, some are straight, and you find this out, especially in China, only after you bought the cable and went home with it. So, the company I was working for (that is 20 years ago) produced "gender exchangers", "crossed" or "straight", a good tool in the hands of any IT technician. This toy, logically, must have either two male connectors, or two female connectors (think about it! or just google "gender exchanger rs232" and look to the pictures). Some "genius" from the project management of that product considered that if you want to "exchange" the gender, then you need to have a small piece of cable with different connectors at the ends. They produced few lots of 10k pieces each until someone realized that the "product" was not useful for anything, except only to extend any serial cable with few centimeters. This is not a joke, some of these "gender exchangers" still can be bought today, a small piece of cable with a male connector at one side, and a female at the other side. Nice! Same as the Asus' expander above... ROFL...

Last fiddled with by LaurV on 2013-08-08 at 07:05
LaurV is offline   Reply With Quote
Old 2013-08-08, 09:03   #10
Manpowre
 
"Svein Johansen"
May 2013
Norway

3×67 Posts
Default possible

I've found high end motherboards large enough to host 4 cards easily. With the air flowing out in the back, and a server cabinet with air intake in front of the cards, it will work. Offcourse the CPU cannot do Prime95, it has to host the processes for the GPU's. and a 1500W powersupply, 16gb memory 1600 speed or faster..

would work.. I actually have 2x 590 boards coming to me in a few days,.. trying to get hold of 4 more.. If I get 4 more, I will order a machine specific for this.. only 1500 USD for the machine anyway.. and see how the machine can perform with all peices together..
Manpowre is offline   Reply With Quote
Old 2013-08-08, 09:04   #11
Manpowre
 
"Svein Johansen"
May 2013
Norway

3·67 Posts
Default

About GTX760.. or 780..
The card has 1/24 DP performance.. for the price, the 580 and especially 590 is way better.

One 590 outperforms Nvidia Titan over number of days.. as a single thread offcourse Titan is the best, but running Ghz days, 590 outperform it.

and the price for these boards used now.. really bang for the buck.
Manpowre is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Curtis Cooper Facts - Chuck Norris style! ixfd64 Lounge 103 2016-07-14 21:07
Ask Curtis Cooper! Xyzzy Lounge 29 2016-03-14 09:42
Running msieve LA with openmpi - do all machines need to be same/similar EdH Msieve 32 2013-11-08 17:57
benchmarks similar to Prime95? ixfd64 Hardware 0 2011-01-12 22:15
Curtis Cooper Achieves Another Major Milestone jinydu Lounge 46 2008-10-17 05:12

All times are UTC. The time now is 17:44.


Sat Oct 16 17:44:37 UTC 2021 up 85 days, 12:13, 1 user, load averages: 1.05, 1.12, 1.18

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.