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GTX 780 folding?

post #1 of 6
Thread Starter 



http://www.tomshardware.de/geforce-gtx-780-performance-review,testberichte-241287-28.html

seems odd to me when Anandtech has it higher , but that is fp64 (double precision)
.



http://www.anandtech.com/show/6973/nvidia-geforce-gtx-780-review/18


http://www.computerbase.de/artikel/grafikkarten/2013/nvidia-geforce-gtx-780-im-test/13/

someone wrote 1/24DP32 for GTX 780, but these are SP (single precision floating point ) benches.
Quote:
One of the highlights of the GTX Titan was that the card did double-precision floating point at full speed, just like one of Nvidia’s Tesla products. That’s no longer the case here — the GTX 780 performs double-precision at 1/24 of normal rate, just like a standard desktop GPU. Other features, like Hyper-Q, Dynamic Parallelism, and GPU Direct are still present. Nvidia is clearly trying to protect its margins with this move, but honestly, the difference won’t likely register with most gamers — double-precision floating point isn’t something most people need in a video card.

There’s one more thing we want to highlight in this section. Nvidia’s GK110 contains 15 SMX units in total. The K20X and GTX Titan use 14 of these 15 cores. The GTX 780 cuts that down to 12. From a yield perspective, this may make a lot of sense — Nvidia can recycle GPUs with more flaws than a single disabled SMX and find homes for them as a GTX 780. Well and good. But it also means that a growing percentage of the 7.1 billion transistors, or about 20% of the total GPU, isn’t functional.
http://www.extremetech.com/gaming/156588-nvidias-gtx-780-titan-like-performance-without-the-1000-price-tag
Edited by AlphaC - 5/24/13 at 1:39pm
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post #2 of 6
OpenCL is the red team zone...
post #3 of 6
titan gets around 130-150k folding on core17 a 7970 gets 100-130k depending on how much your overclocking if your in it for folding only your best bet would be 2 7970s.
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post #4 of 6
Thread Starter 
GTX TITAN DP = 1/3 SP ~1.3 TFlop
Tahiti DP DP = 1/4 SP ~ 700Gflop - 1 TFlop
Cayman DP = 1/5 SP ~700 GFlops

Pitcairn DP = 1/16 SP ~100-200Gflop
GF110 = 1/8 SP ~ 160 Gflop
GTX 780 DP = 1/24 ??? ~170Gflop?
GK104 DP = 1/24 SP ~100Gflop

NVIDIA going towards way less DP floating point to claim lower TDP on high end cards?
Edited by AlphaC - 5/24/13 at 2:31pm
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post #5 of 6
Titan is more efficient than Tahiti, has nearly the same TDP and power consumption as 780 and has more FP64 performance, your argument is invalid.

It's just to force people to buy Teslas and in the case of GK104 to save die size. It's questionable whether FP64 really causes large discrepancies in MD anyways. No need to have it on most consumer cards.

Also, PG might get nVidia cards back on CUDA. Currently nVidia's OCL implementation is lacking since they want CUDA to prevail and don't care much about OCL, not necessarily hardware limitations.

That being said, even if less efficient Tahiti is the most cost effective. Makes more sense to get those for folding.

I don't see why you really care or feel the need to spam AMD vs nVidia threads and articles all over OCN though... wth.gif
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post #6 of 6
I have 780s, Titan's and 7970s folding.

with core17 units (7663), my dual GPU systems produce (all have identical base systems):
Titan: 330k ppd (440 watt)
780: 280k ppd (430 watt)
7970 GE: 200k ppd (380 watt)

With 7663 work units, the NVidia cards run stable at 1175 MHz. With 8900 WU and its more optimized core17, frequency need to be reduced a bit to avoid throttling.

By and large, the ratio Titan and 780 for folding is the ratio of SMX units (14 vs. 12)

Will add 2 EVGA superclock 780s next week - don't know yet which frequency they will be able to sustain.The current 780s are stock versions.

Andy
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