# Power Supply for 2x GPU GTX 1070? **URL:** \ **Category:** Mining\ **Created:** [July 29, 2017, 8:20pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824 "2017-07-29T20:20:29Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![GTCG](https://avatars.discourse-cdn.com/v4/letter/g/a698b9/32.png) [@GTCG](https://forum.zcashcommunity.com/u/GTCG)\ **Post date:** [July 29, 2017, 8:20pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/1 "2017-07-29T20:20:29Z")
Hey everyone, I’m working on building a small mining rig, but a bit in doubt about my PSU.Which PSU would be sufficient to power 2x Nividia GTX 1070’s GPU’s for mining ZEC? I’ve read it takes about 170W per card but I want to be really sure about this. I have a PSU of 520W lying around but I’m afraid that will be a bit short… What do you guys think? Or maybe I should get a PSU of 600W or higher? Other hardware is rather light: Intel Celeron G1840 Boxed → CPU Gigabyte GA-B85M-D3H → MOBO 4 GB of Ram SSD drive 128 GB Thanks! ---
**Author:** ![jimmy97one61](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/jimmy97one61/32/3251_2.png) [@jimmy97one61](https://forum.zcashcommunity.com/u/jimmy97one61)\ **Post date:** [July 29, 2017, 8:43pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/2 "2017-07-29T20:43:09Z")
Hey, 150W(100%TDP) per card 170(114%TDP) per card Find a PSU rated at least 80 PLUS Gold with 2x 6+2 PCIE connector I consume 380W to the PSU with 3 1070s at 70%TDP (315W) it should answer to your question ---
**Author:** ![GTCG](https://avatars.discourse-cdn.com/v4/letter/g/a698b9/32.png) [@GTCG](https://forum.zcashcommunity.com/u/GTCG)\ **Post date:** [July 29, 2017, 10:53pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/3 "2017-07-29T22:53:44Z")
Aha, thanks for your answer. I have a Seasonic S12II bronze 520W which does not have 2x 6+2 PCIE connectors. (only 1x) Guess I’ll look for another solution then. Thanks! ---
**Author:** ![jimmy97one61](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/jimmy97one61/32/3251_2.png) [@jimmy97one61](https://forum.zcashcommunity.com/u/jimmy97one61)\ **Post date:** [July 29, 2017, 11:22pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/4 "2017-07-29T23:22:03Z")
> **[Amazon.com: Cable Matters 2-Pack 8-Pin PCIe to Molex (2X) Power Cable 4 Inches :...](https://www.amazon.com/Cable-Matters-2-Pack-8-Pin-Inches/dp/B01DV1Z428)** > > Amazon.com: Cable Matters 2-Pack 8-Pin PCIe to Molex (2X) Power Cable 4 Inches : Electronics ---
**Author:** ![jimmy97one61](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/jimmy97one61/32/3251_2.png) [@jimmy97one61](https://forum.zcashcommunity.com/u/jimmy97one61)\ **Post date:** [July 29, 2017, 11:22pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/5 "2017-07-29T23:22:54Z")
[https://www.amazon.com/gp/aw/d/B007Y8FSMQ/ref=mp\_s\_a\_1\_1?ie=UTF8&qid=1501370540&sr=8-1&pi=AC\_SX236\_SY340\_FMwebp\_QL65&keywords=sata+to+8+pin&dpPl=1&dpID=31h3X3N6UnL&ref=plSrch](https://www.amazon.com/gp/aw/d/B007Y8FSMQ/ref=mp_s_a_1_1?ie=UTF8&qid=1501370540&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=sata+to+8+pin&dpPl=1&dpID=31h3X3N6UnL&ref=plSrch) ---
**Author:** ![juhub](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/juhub/32/5875_2.png) [@juhub](https://forum.zcashcommunity.com/u/juhub)\ **Post date:** [July 31, 2017, 6:54pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/6 "2017-07-31T18:54:56Z")
I am running 4x 1070 on 750W Bronze Corsair PSU with plenty of juice left. You can probably run 2x1070 and drop to 550w PSU if its of good quality, but I would be careful. Make sure the PSU does not overheat - keep good ambient temp in the room. Usual power for 1070 is between 170 to 220 W depending on the 1070 model. (if not down-clocking) Do your math (adding your other cpu, mb etc consumption) if you want to run on full power/speed. If you have some $$, just get a decent PSU. You spent 400USD+ per video card and you dont want to get a decent cpu which is like 15%-20% of the price of one video card 🙂 ---
**Author:** ![jimmy97one61](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/jimmy97one61/32/3251_2.png) [@jimmy97one61](https://forum.zcashcommunity.com/u/jimmy97one61)\ **Post date:** [July 31, 2017, 7:03pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/7 "2017-07-31T19:03:37Z")
4x 1070s at 70%TDP mining Ethereum ![Screenshot_20170731-150110](https://sea2.discourse-cdn.com/zcash/uploads/default/original/2X/f/f4a429ca5e23739bd8b23dd8dc8f14244188f3bf.jpg) > [@juhub](#): > > 170 150÷100×112=168W So 170 is more close to the maximum wattage ---
**Author:** ![juhub](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/juhub/32/5875_2.png) [@juhub](https://forum.zcashcommunity.com/u/juhub)\ **Post date:** [July 31, 2017, 7:11pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/8 "2017-07-31T19:11:28Z")
If lowering the power - yes. It should work, but then you loose some juice for mining ZEC. With Ethereum its another story. Anyhow, the Seasonic 520W has a max of 480W on the 12V. So take this into account. Its all about the numbers :)) ---
**Author:** ![jimmy97one61](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/jimmy97one61/32/3251_2.png) [@jimmy97one61](https://forum.zcashcommunity.com/u/jimmy97one61)\ **Post date:** [July 31, 2017, 7:18pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/9 "2017-07-31T19:18:30Z")
I run at 80%TDP for Zcash (150÷100×80×4=480 for GPUs) The goal is to save money with a nice efficiency (Sols/W) At more than 180W your consumption is at least equal to a 1080 with less Sols/s ---
**Author:** ![juhub](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/juhub/32/5875_2.png) [@juhub](https://forum.zcashcommunity.com/u/juhub)\ **Post date:** [July 31, 2017, 7:21pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/10 "2017-07-31T19:21:23Z")
I don’t mind the electricity cost 🙂 but your post makes sense if you want to save on electricity and have some efficiency. ---
**Author:** ![jimmy97one61](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/jimmy97one61/32/3251_2.png) [@jimmy97one61](https://forum.zcashcommunity.com/u/jimmy97one61)\ **Post date:** [July 31, 2017, 7:25pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/11 "2017-07-31T19:25:52Z")
What is your electricity cost? 🙂 mine is free my dad told me that he dont want my money xD But i dont want to explode the electricity bill with these\* shitty current cryptocurrencies prices\* ---
**Author:** ![17outs](https://avatars.discourse-cdn.com/v4/letter/1/9e8a1a/32.png) [@17outs](https://forum.zcashcommunity.com/u/17outs)\ **Post date:** [July 31, 2017, 7:38pm UTC](https://forum.zcashcommunity.com/t/power-supply-for-2x-gpu-gtx-1070/19824/12 "2017-07-31T19:38:41Z")
I use an EVGA 650 Gold and 2 1060 powered down to max efficiency is only 280 watts.