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Kepler, born March 22

Moderators: Dan Negrut, ME964 Spring 2012

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Dan Negrut

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Unread post Thu Mar 22, 2012 4:04 pm

Kepler, born March 22

I mentioned at some point that Fermi will be replaced by Kepler as the next generation Nvidia GPU architecture.
The first Kepler card was released today, and it's a major step forward. I haven't got a chance to look at all the details, but on the plus side, i noticed that the number of SPs went up from 512 (max on today's arch) to 1536.
On the down side, the bandwidth stayed the same (192 GB/s). The peak FLOP/s rate doubled. They support PCI 3.0. Technology used is 28 nm.
The model released today is a genuine graphics card for graphics. I believe the actual Kepler card for Scientific Computing is going to come out in Nov-Dec timeframe and will have superior double precision support and maybe even better bandwidth for global mem access.
Here're some useful links in case you are interested (thank you, Andrew):
http://www.tomshardware.com/reviews/geforce-gtx-680-review-benchmark,3161.html
http://www.geforce.com/Active/en_US/en_US/pdf/GeForce-GTX-680-Whitepaper-FINAL.pdf
The card apparently got really good reviews.
Dan
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S12zguo

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Unread post Sat Mar 24, 2012 10:40 pm

Re: Kepler, born March 22

One note, they apparently crippled the double precision performance in the consumer version of the Kepler card (well, crippled insomuch as you don't see any performance gain when using double precision compared to a Fermi card). Might want to wait until the Tesla version comes out before you upgrade, Dan. :D
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Dan Negrut

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Unread post Sat Mar 24, 2012 11:22 pm

Re: Kepler, born March 22

Incidentally, they crippled the 480 too, it's 1/4th of what a Tesla C2050 can do in terms of DP.
As for the 680, it is slower than a Fermi Tesla card - see bullet 6 here:
http://www.pcmag.com/article2/0,2817,2402021,00.asp
the DP version of Kepler will probably come out in Dec or so.
Dan
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Andrew Seidl

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Unread post Sun Mar 25, 2012 5:11 am

Re: Kepler, born March 22

I've heard that they apparently needed more development time to get DP working properly. Gamers mostly only need SP, so here we have 680.

But yeah, the eventually updated consumer versions (780?) will probably still be limited to about 1/4 the Teslas' DP so that they have more of a selling point than just additional (ECC) RAM and copy engines. Once we get a one or two in the lab, we'll see how our code performs with the limited internal bandwidth.

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