Well, was perusing around the ol' fleabay hunting grounds for cheap, decent graphic cards, and came across this one: NEW NVID GeForce GTX 770 3GB 198Bit GDDR5 PCI Expres Graphics Card VGA DVI HDMI, and even though the Too Good To be True Spidey Sense was hammering away, I thought I would pull the trigger and grab a pair.

I guess (best) worst case is that as it is an eBay transaction, I'm covered for at least a bit, and I will obviously be running them hard and putting them away wet for as long as that guarantee lasts, plus the price is decent, better than the best price I've seen on a EVGA 750 card recently, well, at least before rebates. So if they flake out and there are any issues, eBay will cover the entire transaction. Worst case is that they flake out after that, and I have 0 recourse.

One thing I did notice is that the 770 that I am trying to stuff into my Z600 has two 6 pin connectors, and this one has just one, which is a little weird, but I guess You pays your money, you takes your chances. The price is had to beat though, for what it appears you get. Of course in a month or 6 I might also be kicking myself... Thoughts?

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Yeah, my 770 has an 8 and a 6 pin connector, so its interesting that they can get it going on a single 6 pin... Also actual name brand 770's use a 256-bit memory interface and now 192-bit... Base clock should likewise be around a GHz not 783MHz, mine is 1100MHz for example. So these may be pretty slow in comparison to a "real" 770... My 770 does 3 wu's in about 1300 seconds and my 750ti's do 2 in about 1400 so you might barely get 750ti level performance if the eBay specs are correct.

Just my 2 cents,

Chris

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I believe the 770 is a little power hungry over the 750, so you will eventually pay for it.

As for power connectors, the 750 also comes with powered and non-powered versions, that doesn't necessary mean it uses more, just configured different.

It is worth comparing its specification with the real Nvidia specification for a TX770:
http://www.geforce.co.uk/hardware/desktop-gpus/geforce-gtx-770/specifications

Somewhat short of the mark in a few places.

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Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?

Yeah, I kind of thought that, the biggest clue was the power connectors, and 192 vs 256 bit. Well, if nothing else and it is about the same perf as a 750, I guess I'm not out anything, other than maybe the warranty, etc. Life's an adventure, right!?! :-) Maybe I'll pull the cover off of one of them and see just exactly what we've got under the skin. That may tell us a few things, though from the my experience from buying things from china, and what the listing states, it will be between 2-4 weeks before I find out.

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Yeah, I kind of thought that, the biggest clue was the power connectors, and 192 vs 256 bit. Well, if nothing else and it is about the same perf as a 750, I guess I'm not out anything, other than maybe the warranty, etc. Life's an adventure, right!?! :-) Maybe I'll pull the cover off of one of them and see just exactly what we've got under the skin. That may tell us a few things, though from the my experience from buying things from china, and what the listing states, it will be between 2-4 weeks before I find out.

I'm pretty sure this is what you are actually getting.
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-760-oem/specifications
As it is the only 192-bit GPU Nvidia made in the 700 series. 1896 GFLOPS & 130W at stock speed. If you can get them to run 869MHz it'd run 2002 GFLOPS & $100 for a 2 TFLOPS GPU is pretty good.

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Hmm, that's not _too_ bad, especially if I could hit the O/C's you mentioned. Well, I'll find out soon enough I suppose, and I wonder if the Precision X 16 will work with it? So many mysteries! lol

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Well, they arrived late last week from China, fairly sparse inside the package, a driver CD and a molex-6 pin adapter, and the card. I tossed it into one of my freshly built systems, and have been letting it run for a few days - Computer 8001193.

It hasn't set the world on fire, but the RAC seems to be slowly creeping up, though it will be a week or to for it to (hopefully) stabilize. Will be interesting to see how it compares to the various versions of the 750 and 950's that I have.

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680 and 770 do pretty well with existing applications :) of my 3 active machines, the Linux one with 680 gets the most credit. Something about it just lucks out (despite being the crappiest of the 3)

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"Living by the wisdom of computer science doesn't sound so bad after all. And unlike most advice, it's backed up by proofs." -- Algorithms to live by: The computer science of human decisions.

Well I'm not real sure what that card is exactly. It's not a 770, wrong compute capability (2.1 instead of 3.0) and only 4 compute units instead of 8. 750ti has 5 and its compute capability is 5.0. On the plus side it doesn't seem to be generating any errors so hopefully it will be reliable for you.

Chris

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Yeah, to be honest with you, I can't tell exactly what it is either, based upon the specs vs. what they are calling it, though some of the responses here seem to have pegged it pretty close to what it appears to be performing at. It certainly isn't a 'real' GTX 770, that's for certain, but I knew that when I purchased it, just based upon the specs that were listed for it. I guess this is sort of an experiment, and see how it compares to the other 7 and 9 series cards that I have running now as well.

Oh, and on a side note, just for fun I fired up another of the XP 64 Atom based boards that I had configed over 3 years ago as an experiment, this one has a GTX295 in it, and boy is it a little heater! I'll let it run for a few weeks and see what kind of output it can generate, but long term that thing has got to go. I Googled the specs on it last nite, and I believe it said that it is a 289 watts! Talk about a horrendous performance/watt situation...

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Well, they arrived late last week from China, fairly sparse inside the package, a driver CD and a molex-6 pin adapter, and the card. I tossed it into one of my freshly built systems, and have been letting it run for a few days - Computer 8001193.

It hasn't set the world on fire, but the RAC seems to be slowly creeping up, though it will be a week or to for it to (hopefully) stabilize. Will be interesting to see how it compares to the various versions of the 750 and 950's that I have.

How many tasks are you running at the same time on this GPU ? It seems a little slow for just one ...
Also, did you try GPU-Z ? It should report the chip that is actually on the card.

Tom

Well, they arrived late last week from China, fairly sparse inside the package, a driver CD and a molex-6 pin adapter, and the card. I tossed it into one of my freshly built systems, and have been letting it run for a few days - Computer 8001193.

It hasn't set the world on fire, but the RAC seems to be slowly creeping up, though it will be a week or to for it to (hopefully) stabilize. Will be interesting to see how it compares to the various versions of the 750 and 950's that I have.

How many tasks are you running at the same time on this GPU ? It seems a little slow for just one ...
Also, did you try GPU-Z ? It should report the chip that is actually on the card.

Tom

It would be interesting to see a screen shot from GPUz of that GPU. From the ebay description it seems like a rebadged 192-bit GTX 760.

My 750ti runs 2 tasks in ~25 min. So we can compare how long it takes vs a 750 or compare to other Kepler GPUs

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Well, they arrived late last week from China, fairly sparse inside the package, a driver CD and a molex-6 pin adapter, and the card. I tossed it into one of my freshly built systems, and have been letting it run for a few days - Computer 8001193.

It hasn't set the world on fire, but the RAC seems to be slowly creeping up, though it will be a week or to for it to (hopefully) stabilize. Will be interesting to see how it compares to the various versions of the 750 and 950's that I have.

How many tasks are you running at the same time on this GPU ? It seems a little slow for just one ...
Also, did you try GPU-Z ? It should report the chip that is actually on the card.

Tom

Working on the GPU-Z screen shot now, it shows it as a GK104 GTX 770, 192 shaders, 790 default clock which I have O/C'ed to 868 and seems to be running ok at that speed. The bus width shows as 192 bit as well. The system is running an X3370 CPU, running 3 out of 4 cores with one reserved for the GPU, and it is running 2 tasks at a time.

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Well, they arrived late last week from China, fairly sparse inside the package, a driver CD and a molex-6 pin adapter, and the card. I tossed it into one of my freshly built systems, and have been letting it run for a few days - Computer 8001193.

It hasn't set the world on fire, but the RAC seems to be slowly creeping up, though it will be a week or to for it to (hopefully) stabilize. Will be interesting to see how it compares to the various versions of the 750 and 950's that I have.

How many tasks are you running at the same time on this GPU ? It seems a little slow for just one ...
Also, did you try GPU-Z ? It should report the chip that is actually on the card.

Tom

Working on the GPU-Z screen shot now, it shows it as a GK104 GTX 770, 192 shaders, 790 default clock which I have O/C'ed to 868 and seems to be running ok at that speed. The bus width shows as 192 bit as well. The system is running an X3370 CPU, running 3 out of 4 cores with one reserved for the GPU, and it is running 2 tasks at a time.

I would have expected to see 1152 shaders.

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Huh, nope, it says 192 Unified, whatever that means.

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Huh, nope, it says 192 Unified, whatever that means.

Unified Shaders = CUDA cores.

Perhaps GPUz is only reading the number per SM. The 760 192-bit card is listed as having 6 SM & 6*192 = 1152

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GPU-Z 0.8.6 on my GTX-750 reports: Shaders: 512 Unified

If it weren't for this I would say you have one of these:

http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-760-oem/specifications

Should still be good value for money, but it is certainly weird.
Hope you can post the GPU-Z screenshot, maybe that will help us figure out what you are dealing with.

Tom

My guess is it's a mobile part put into a PCB. There were some Fermi (those are cc 2.1) based 7xxM parts if memory serves. Plus of course all the 400, 500 & 600 series mobile parts. Anyway that's where I'd put my money...lol

Chris

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Huh, nope, it says 192 Unified, whatever that means.

Unified Shaders = CUDA cores.

Perhaps GPUz is only reading the number per SM. The 760 192-bit card is listed as having 6 SM & 6*192 = 1152

Looking at my EVGA GTX 760, I have 1152 shaders with a 256 bit bus width. Direct Compute 5.0

GPU clock: 980
Memory: 1502
Boost: 1033

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