http://www.anandtech.com/show/5911/nvidia-announces-retail-gt-640-ddr3,
by Ryan Smith.

I'm just saying they now exists, and I'm not saying 'buy one'!

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hm, i just buyed one. lol

Now its the question , will it works well on cuda 4.0 and 4.2 apps ?

Any results on that , is it allready testet with beta apps ?

if there anybody who can tell about results ?

greetings

Should work in the same way as the bigger Kepler cards. Expect ~1/4 the performance of a full GK104 at similar clocks.

MrS

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Scanning for our furry friends since Jan 2002

http://www.palit.biz/palit/vgapro.php?id=1894

ok, its this card.

cant calculate the gflops on this , i got no comparsion table.

Edit: ok i found a comparsion table on wiki that says:

12.24 Gflops per wattage = means 65 * 12.24 = ~ 800 gflops , not bad :)

hm, i just buyed one. lol

Now its the question , will it works well on cuda 4.0 and 4.2 apps ?

Any results on that , is it allready testet with beta apps ?

if there anybody who can tell about results ?

well, at least you could. ;)

got that thing up and running?

Not yet, waiting for the ordering confirmation, still waiting , its saturday u know. :o/

12.24 Gflops per wattage = means 65 * 12.24 = ~ 800 gflops , not bad :)

384 Shader * 2 Operations per clock * 900 MHz = 691 GFlops. However, 2 Ops/clock per shader is a theoretical maximum, which can hardly be achived in the real world. But we've been calculating nVidia Flops like this for a long time, so at least it's consistent for the sake of comparison.

MrS

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Scanning for our furry friends since Jan 2002

I expect the GT 640 should just about match a GTX 550 Ti in terms of runtime performance, but maybe the 4.2 app will be favourable to it. Obviously the 65W TDP is much more attractive than the 116W of the GTX550Ti.
At the end of 2009 the GT240 entered the scene. It was a bit of a sweet entry level card; an early 40nm GPU only requiring power from the PCIE slot (69W TDP). If the GT 640 offers reasonable performance at <75W then it might be a good entry level card and allow more people to contribute. The recommended minimum PSU for such cards is only ~350W. I would also expect the GT640 to actually use about 35 to 40W.

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Bad news , for me, the ordered GT 640 was a GT 620. A database error by the vendor.

Very Good News !

I thought i ordered a stallion. They provide me a snail (GT 620), in the end i got now a pony (GT 640) :lol

PAOLA task 4.2 on its way to completion. Almost about 5 hours , anybody who completed it or another with a GT 640 ? Approximately completion about 8 hours.

ok IBUCH took about 6 hours.

Performance roughly as expected. It would probably match the GTX 550 Ti, if it could run the CUDA 3.1 app, but on the CUDA 4.2 app it's actually matching a GTX460, due to the GTX600 series improvements in performance over the GTX400/500 series. Cool.

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Performance roughly as expected. It would probably match the GTX 550 Ti, if it could run the CUDA 3.1 app, but on the CUDA 4.2 app it's actually matching a GTX460, due to the GTX600 series improvements in performance over the GTX400/500 series. Cool.

well, REALLY cool!

considering it's only drawing ~50W out of the wall, time to go green..

it must be about 65 Watt who´s coming out of the wall,
but it will drag less power as a 550 Ti (116watts).

Think in mind , when u overclock/voltage the power saving
is surely lower ;) so i did, cant hold me back an overclocked
it. So warranty has void :b who cares !?

Why must it draw 65 W? Because TDP is stated as 65 W by nVidia? Well.. no. Cards usually draw less than TDP at GPU-Grid and crunching in general. Consider this: you're probably not even at 100% GPU utilization, let alone using the TMUs etc.

So it seems like such a card is good for ~44k RAC here.

Overclocking actually improves power efficiency here. Overvolting doesn't.. but I hope you're not pushing the card to 2x the power consumption ;)

MrS

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Scanning for our furry friends since Jan 2002

but I hope you're not pushing the card to 2x the power consumption ;)

I hope too (looking at my electricity bill), for the rest of the month i can only run this card :D. I am almost at 50,-€ for this month, thats quiet enough for me.

i have not tryed to overvoltage this card, i am hope others may try this before me, please :D.

Long term overvolting is even less recommended on lesser cards.
These are fairly 'green' cards compared to previous generations, but the bigger cards probably do more per watt, especially if you look at the power consumption of the system. Their niche is low end desktop systems with average PSU's.
As it's matching a GTX460 then it's doing the same work for half the electric consumed by the GPU.
The ~44k is for normal tasks. This should improve for the longer tasks, especially if the card can return them inside 24h.

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Well.. overvolting it still wouldn't cost much.

Stock load voltage seems to be 1.00 V. AMD is using 1.20 stock on the same process, so this would be the maximum I'd think about using. At 1.10 V power consumption would increase by a factor of 1.21 (1.10^2/1.00^2), pushing the card from an estimated 50 W to 60.5 W and maybe getting you another 100+ MHz core clock (-> ~10% performance increase).

Overall that's not too bad (considering you'Ve got an entire PC up'n running to feed the card), but 1.20 V may push the boundaries of PCIe power delivery: 1.20^2/1^2 = 1.44, i.e. a 44% increase in power consumption. Here we'd be talking about 72 W for maybe another 50+ MHz - diminishing returns.

MrS

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Scanning for our furry friends since Jan 2002

I think undervolting maybe an option.

To maintain clockrates an lowering core voltage.

Edit:

ok ,that saved me 5 Watts , cant go lower because of hardware restriction of the card. :/

I have checked all data and think it was a misstake, cant lower the core voltage,

no software worked correctly . Using EVGA Precision and Asus GPU Tweak.

Any guesses ?