There are boards that communicate directly from PCI-E to GPU without CFX bridge. MSI (as well as Asus) made/designed a board or two a few years back using two mobile Radeons, each using 8 of the 16 PCI-E channels through older MXM slots. Asus actually sold one (Trinity) with three MXM slots for triple CFX in one PCI-E board. Nevertheless mobile GPU may not be the best choice for many obvious reasons, cost being perhaps the major one. MSI Germanium http://adler-pc.com/news/msi.mxm03b.jpg |
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One would think the memory chips would be fewer and denser. The VRM appears somewhat replicated, the lack of a CFX controller, and 2 SLI connectors...hmmm
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I have a Sapphire 6850 lying around, and noticed solder terminals to attach a secondary 6 pin PCIE power cable. It seems the solder points are connected to to an incomplete power circuit. Has anyone reconstructed such a circuit on a graphics card? A 6850 flashed to a 6870 remains a 6850 functionally; would an additional power circuit alter the functionality or permit performance as a Sapphire Toxic (OC) card? Example pic:  |
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My first 7970 came with a number of issues while booting. I had it RMA'd, the new card that just arrived reaches 750 MH/s (1225MHz core, 1375 ram, 1.07 V, 168A) with sensor readings (HWiNFO64) indicate I am pulling 193 watts (Core + RAM). My first card would already be over 220 watts at these settings, seems either software improved or hardware improved, I used the same drivers from the end of Feb, so probably hardware changed?
How accurate are the GPU/CPU sensor readings by GPU-Z or HWiNFO64? Would using a multimeter carefully to measure PCIE and all other power connectors on system be more accurate than onboard sensors or KILL A WATT?
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I get the impression that building an outdoor mining would require a tremendous amount of planning, not just pitching a tent and passing a power cord, obviously. I know some sites like Amazon sell Shelter storage sheds, but the floor inside is meant for grass. I guess ventilation, heat (solar/climate), humidity, life (pests?), dust, and flooding/blizzards might pose a problem. Other ideas possibly more costly is to liquid cool the miner with outdoor passive radiators, or using a series of specific designed roof vents (roof-like)?
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I ran a WC 7970 and a 6850 together, both pull close to 500 watts under a heavy overclock, 300 watts is too low to be true for two 7970's. Sensor readings on 7970 show core around 210 watts with memory around 30 watts; thus actual cards are pulling in well over 200 watts. I get around 3.75 MH/W. Something is most definitely wrong with your meter or your math, my friend. At that clock/voltage, you should be drawing a bit over 200 watts per card (at the wall). I have three 7970 rigs and they all draw more power at a lower core clock, lower voltage, and a lower memory clock. To top it off, they don't have hard drives either. Hell, my water cooled 7970 rig would draw more power than this. In fact...  I tried to get as close to that clock/voltage as possible (my cards aren't stable at that core/voltage combo). With your same settings but 25 Mhz lower on the core clock, I've got 512 Watts total system power consumption with 2 cards. Granted, this is on a machine with an i7 930, but this measurement was done with no CPU overclocking. All components (including the GPUs) are water cooled. Even if you're just trying to calculate the power draw of the GPUs themselves, your measurement is off somewhere. My pump draws 9 watts. My idle CPU, board, SSD, and a few power controlled fans aren't going to suck up 212 watts. |
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Huh that is interesting, I could never get RAM below 1100, is 685 what Afterburner shows, does GPU-Z sensor readings indicate that same speed? Finally made the plunge on a Killawatt....what fun!
I don't know if this is unprecedented, but I was able to overclock AND undervolt 2 of my 7970's and drop the power consumption by a huge amount.
my settings:
Core voltage: 1060
Clock: 1125
Mem: 685
This was pretty stunning to me, but I am getting 1300+ MH/s @ 300+- watts.
4.33 MH/watt.
Now I realize this is not impressive when compared to massively undevolted and underclocked GPU's, but this is a massively OVERCLOCKED set-up! As a bonus the temps droppe a good 5 degrees with the same fan speed.
Just throwing it out there.....I was pretty thrilled. I will report back if it stays stable for 24 hours.
That is a pretty good spot to hash at, are you air cooling? It will most likely be stable at that speed. Anything higher than 1125 MHz will increase wattage significantly, voltage will only need to be changed at ~1240MHz (~200 watts). How did you decrease RAM clock, was it through driver? Yes, air cooling with a small external fan blowing on them as well. I decreased Mem clock using Afterburner beta 12.....it is the only tool I can get to clock it that low. |
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Finally made the plunge on a Killawatt....what fun!
I don't know if this is unprecedented, but I was able to overclock AND undervolt 2 of my 7970's and drop the power consumption by a huge amount.
my settings:
Core voltage: 1060
Clock: 1125
Mem: 685
This was pretty stunning to me, but I am getting 1300+ MH/s @ 300+- watts.
4.33 MH/watt.
Now I realize this is not impressive when compared to massively undevolted and underclocked GPU's, but this is a massively OVERCLOCKED set-up! As a bonus the temps droppe a good 5 degrees with the same fan speed.
Just throwing it out there.....I was pretty thrilled. I will report back if it stays stable for 24 hours.
That is a pretty good spot to hash at, are you air cooling? It will most likely be stable at that speed. Anything higher than 1125 MHz will increase wattage significantly, voltage will only need to be changed at ~1240MHz (~200 watts). How did you decrease RAM clock, was it through driver? |
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Someone tested Kepler and posted numbers in some topics already: ~105 MH/s. I stumbled upon this webpage, provides possibly the whole line of Kepler cards yet to be released, apparently there will be a GTX 685 preceding the GTX 690. http://videocardz.com/31551/geforce-600-roadmap-partially-exposed-gtx-670-ti-coming-in-mayFrom the Newbie section: https://bitcointalk.org/index.php?topic=74215.0Sorry, I can't post in the main 680 thread because I lurk. Hey, just got back from the store with a 680. Here's a quick benchmark for people, and it's not looking good so far. This is a stock EVGA gtx680, with latest drivers (301.10) and ufasoft 0.28, run with -t 0, under win7 x64. Getting around 105Mh/s.  Thankfully I didn't buy it for mining. |
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Wow. Those heat pipes...take up too much space. Maybe just submerging it in an inert medium would probably be more convenient...
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Still no answer as to how this card can perform under bitcoin mining huh? This card appears to be sold out in a number of places, but still no actual figures, surely someone must have done some experimentation with Kepler by now at the very least. Still curious about this brand new piece of hardware, anyone have any results?
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Well, lets be real about this: More than 24 hours have passed since Kepler appeared in the market. The 7970 at launch already had tests performed on mining, and results were already published in reviews. This is probably the fourth (+fifth?) topic on this card in this forum, yet no data is available for its performance in mining on the internet. Only speculative theoretical numbers have appeared in this forum, though we know the card is "castrated" in at least one sense, and "leaner" than its previous generation for graphical operations. nVidia site and online reviews talk about games, games, games, and some potentially interesting/relevant synthetic benchmarks. There are reviews that discuss Kepler "GPGPU functionality" to be mainly in Quadro and Tesla. Seems convincing the the lack of publicity on mining might indicate this card is best suited for killing dragons and firing/reloading weapons? Economics of PW cracking, nvidia & AMD: http://www.youtube.com/watch?v=CKNW5AUo-dM#t=13m22s |
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Did not copy quote properly, BSN states the current Kepler reaches 3.09 TFLOPS in single precision, and possibly 1/8 in double. Not much about GPGPU performance is currently discussed (at least until May during GPU tech conference). If it is possible to unlock (says BSN), Kepler should reach between 1.54 to 2.32 TFLOPS in double precision. I wonder how true these numbers are in practice.
Wonder how AMD will reconsider the pricing on GCN, and how perhaps Intel's possible upcoming graphics card will perform in GPGPU.
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Bright Side of News did a neat analysis on the architecture of the gpu released today: http://www.brightsideofnews.com/news/2012/3/22/nvidia-kepler-analysis-another-masterpiece-from-the-architects-of-g80-or.aspx?pageid=1...By looking at raw numbers, Kepler features higher efficiency that Fermi but there are some parts which remain the same, as LD/ST (Load/Store) units inside each SMX unit. This result in 64-bit operations executed much in the same way as Fermi - at least on the consumer side of things. The most important bit is the numbers of instructions per clock: while Fermi (GF100/110) executed up to 1024 instructions in a single clock, i.e. 1.58 million instructions per second, Kepler (GF104) executes 2048 instructions per clock, i.e. 2.06 million instructions per second. If there was any doubt why GeForce GTX 670 Ti became GeForce GTX 680, this is it.
GPU Computing & Double Precision: Yes, the GeForce Kepler is Castrated... Edit: Did not copy quote properly, BSN states the current Kepler reaches 3.09 TFLOPS in single precision, and possibly 1/8 in double. Not much about GPGPU performance is currently discussed (at least until May during GPU tech conference). If it is possible to unlock (says BSN), Kepler should reach between 1.54 to 2.32 TFLOPS in double precision. I wonder how true these numbers are in practice through mining. Wonder how AMD will reconsider the pricing on GCN, and how perhaps Intel's possible upcoming graphics card will perform in GPGPU. |
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Given the fact that no reviews so far mention bitmining as an application for the 680 (7970 benched for mining at release) and the history of nVidia's cards not being comparable to the Radeon line-up in mining, is it safe to say that the 680 is suited only to be a gaming card? (Unless an expert CUDA programmer can map out bitcoin mining effectively over 1536 nVidia streams?)
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I just glanced over the article again, the site used SiSoft Sandra 2012; the graphs comparing both cards are labeled as "double shader Mpix/s" and "Float Shader Mpix/s" instead of double and single precisopn, does this difference in terminology matter?
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There are numerous topics in this forum already posted regarding the upcoming 680 GTX. So far I have not seen any reviews investigating bitcoin mining on this new gpu, nVidia's website does not mention its application for mining, it is mentioned merely as a gaming card. Has anyone found any solid numbers? The 680 triples in number of streams over the 580, despite architectural differences, what does this translate to versus the 7970? Perhaps the closest benchmark posted on the net so far concerning GPGPU performance is on the Bright Side of News: this article compares single and double precision power between the 680 and 7970, and the 590 vs 680 in CUDA (590 wins in double precision). The 7970 significantly "smokes" the 680 in double precision in cryptography, yet the 680 "smokes" back the 7970 in single precision. Another article on this website will be published analyzing the 680's architecture more in depth yet. Article: http://www.brightsideofnews.com/news/2012/3/22/nvidia-gtx-680-reviewed-a-new-hope.aspx?pageid=4 |
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Hmm...I don't seem to experience any of these issues. My best guess would be making sure the high performance profile has nothing going onto idle (screen or HD shutting off), obviously the machine will not hibernate or go to sleep in such a profile. I am assuming that in the power options (control panel), beside the option "High performance" you clicked and looked at the far right into the "Change plan settings," and saw no time limits that would suspend any operation of the computer? There is another option further into "change plan settings," which is just above "restore default settings for this plan," called "Change advanced power settings," there could be a setting that may be causing your idling, wouldn't hurt to investigate a power plan I guess.
Are there any power saving features activated for the CPU in the motherboard BIOS (not sure if the power saving states might affect this, mining not heavily dependent on CPU, but does require a CPU)?
If none of these remove the idling, I do not know what else would force the gpu to mine continuously, unless a mining app could prevent idling.
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