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The GeForce GTX 750 Ti series of graphics cards based no the new Nvidia Maxwell architecture have really captured the attention of crypto currency miners due to their good performance (hashrate) per watt. Nvidia is advertising these cards to have 60W TDP, however we have discovered that the actual TDP limit for the power target set in the video BIOS of these cards is 38.5W…
This made us dig into the matter a bit more in order to see how much power actually does a GeForce GTX 750 Ti draw from the motherboard (a reference GT 750 with no external PCI-E power connector). So we’ve attached a watt meter to the power line of an external PCI-E extender to see how much power is drawn by the GT 750 Ti card. The results we got were quite surprising, even though we knew that the default power consumption should fit in the 38.5W limit for the power target set in the BIOS. With the stock frequencies for the GPU and the video memory the GeForce GTX 750 Ti has shown to draw just about 28W ot power producing about 250 KHS hashrate for Scrypt mining. After getting the card overclocked to +135 MHz for the GPU and +650 MHz for the video memory the power consumption has risen a bit to about 34W average with a hashrate of about 300 KHS for Scrypt crypto mining.
So if you were calculating the power usage of GTX 750 Ti as 60W in order to see the ratio of hashrate per Watt of power, then you should rethink how you calculate it now. Note that this is the actual power that goes from the PSU to the video card, the real power consumption with a 80 Plus certified power supply that provides 90% efficiency for example would rise with 10% to about 30W (stock) and 37W (overclocked) respectively as the actual power drawn by the card from the wall socket.
- In: Mining Hardware|Tests and Reviews
- Tags: CUDAminer, GeForce GTX 750 Ti, GeForce GTX 750 Ti power consumption, GeForce GTX 750 Ti power usage, GTX 750 Ti, GTX 750 Ti Bitcoin, GTX 750 Ti crypto mining, GTX 750 Ti cudaminer, GTX 750 Ti Litecoin, GTX 750 Ti mining, GTX 750 Ti power consumption, GTX 750 Ti power usage, GTX 750 Ti scrypt mining, Maxwell Bitcoin, maxwell crypto mining, Maxwell cudaminer, Maxwell Litecoin, maxwell mining, Maxwell scrypt miner, Nvidia, Nvidia GeForce GTX 750 Ti, Nvidia GTX 750 Ti mining, nvidia maxwell mining
Earlier this month we have mentioned the announcement of the ScryptGuild pool in their Alfa stage with invite only access and now the pool has moved to Beta stage and is open for free registrations. ScryptGuild is a pool with multiple alternative crypto currencies and an automatic switching algorithm that allows you to mine the most profitable crypto at the moment. It is similar to Multipool and the likes of it, however ScryptGuild offer some extra features that make it more attractive. For example you can set only one mining pool and switch to different cryptos to be mined on per worker basis directly from the web interface, there is also an option to directly sell your alternative coins that you have mined for BTC. Not to mention that the list of alternative cryptos is more up to date based on the more profitable coins at the moment and not keeping coins that you will probably not want to mine anymore like in Multipool for example.
ScryptGuild uses PPLNS system for distributing miners earnings or Pay per Last N Shares. This is a payment method which does not allow for pool hopping because it pays for work done previously, rather than paying for work based on the concept of “rounds”. ScryptGuild applies payments to the 5 most recent shifts: The active shift, and 4 recently finished (“open”) shifts. Payments are applied on a per coin basis, using your score on that coin vs the total pool score on that coin. Shifts are closed every hour, one minute after the hour. The pool fee is 2% and the current hashrate of the pool is already about 2150 MHS. You can set the minimum difficulty level starting from 16 and going up for each worker independently, so it is also a goo d place for low hashrate miners such as Nvidia-based GPUs or small Scrypt ASICs like the USD DualMiners.
We have been using the pool for a few days already and like the stability and ease of use, along with the useful extra features that it offers, including the direct sell for BTC from the pool with a slightly higher fee than if you move your coins to an exchange and sell them there (you can still do that if you wish). So we have said good-bye to Multipool and have switched to ScryptGuild completely for our main alternative profit based mining pool. And our backup pool for a while already is LTC Rabbit, though at the moment the extra altcoin bonus that this pool offers is rarely seen and most of the time we are mining LTC directly there instead of alt coins. Still good for a backup pool though as it is stable and runs reliably, so we would still recommend it as a good backup option. The combination between the two pools works like a charm for us, so we do recommend to try it out yourself if you still hasn’t done so.
– To check out the new ScryptGuild Scrypt-based alternative crypto mining pool…
The Geforce GTX 750 Ti video cards based on the new Maxwell architecture from Nvidia have generated quite a lot of interest among the users mining crypto currencies thanks to their very good hashrate per watt of used power. And after we have tried a reference GTX 750 Ti board that does perform pretty well and overclocks decently to provide some extra hashrate we are now moving to trying out different non-reference design video cards based on the GTX 750 Ti. Out goal is to find the best choice for overclocking and gaining the maximum possible performance for use the GPU for mining crypto currencies. So we took a Gigabyte GTX 750 Ti (N75TOC-2GI) video card for a spin to see what we can get out of that board…
The default Scrypt mining performance with CUDAminer was about 273 KHS, or slightly more than what we got with the reference card at stock frequencies of about 265 KHS. The two advantages of the Gigabyte board were the presence of an external PCI-E power connector and the much better cooling solution compared to the stock cooler. However we have found out that the TDP limit of the Gigabyte was still set at 38.5W in the video BIOS, though with the Power Target limit removal method you can get much higher limit set and avoid the Power Target functionality limiting your performance.
Overclocking the Gigabyte GTX 750 Ti card to +135 MHz for the GPU and +700 MHz for the video memory brought the Scrypt mining performance to about 303 KHS (the maximum stable clocks for mining), however we were hitting the TDP limit. So we have increased the TDP limit to 65.5W by modifying the video BIOS and flashing the modified version on the Gigabyte board and the result we got with the same overclocked frequencies was up to 322 KHS. Unfortunately the Gigabyte board did not allow for higher GPU frequencies that +135 MHz or to increase the GPU voltage higher than the default value. And while 322 KHS with a silent operation and 42 degrees C of the GPU is not a bad result at all, we are going to be checking out other different GTX 750 Ti boards to see if we are going to be able to get a bit more hashrate than that. So stay tuned for more updates on that…