der8auer Posted April 20, 2015 Share Posted April 20, 2015 (edited) Over the last 2 weeks I soldered 9 x A/E/G-Power to TitanX cards and I wanted to give a little feedback of what 8 Pack and me experienced while benching a ton of TitanX cards. GIGABYTE GPower Initially we planed to use 4 x G-Power from GIGABYTE because you can connect the G-Power controller via USB to the system and controll the cards over software. It's easier for 4 cards than using the controller. Following my TitanX-External-Power-Guide I attached one G-Power first and applied the normal FB-Memory mod. However, using 1,75 Volt on the memory the stock VRM died. Probably just bad luck because on all other cards the mod worked without any problems. As a result I attached the G-Power V2 voltage output to the memory on the card so we can still use it. The problem is that we lost about 200 MHz on the memory moving from stock VRM to G-Power on memory. Testing the G-Power on the core we always experienced OCP at around 1800 MHz @ 1,6 Volt (all voltages down to 0,0 Volt. G-Power shut down). I first thought it was just a problem with the card itself but we had exactly the same on the 2nd card. So my conclusion about G-Power so far: + Software-Control possible - Don't use V2 at all on memory or you lose MHz. Always keep stock VRM - You will face OCP. We're already in contact with sofos and Hicookie but so far we couldn't find a solution EVGA EPower 2.0 The EVGA EPower works very well acually. We used it on 3 cards and no OCP/OVP or anything else. However, two EPower cards died at around 1,8 Volt and 2k+ MHz on the core. I guess there is no ocp and the power draw was just too much for these cards. On one card we suddenly had a spark near the front MLCC capacitors and eventually one tantal cap blew up: picture courtesy Overclocking TV So I removed the EPower and luckily the card was still alive (GPU resistance ~3 ohm). So I attached our spare EPower which worked fine for about 5 hours. Suddenly bad smell and all LEDs of the EPower shut down. So again - EPower dead. This time there was an internal short close to the mid PCIe-Connector. The ground layer of the EPower near the connector was totally burned so I guess there was an internal short somewhere (forgot to take a picture of this - sorry). So my conclusion about EVGA EPower 2.0: + The Board works very well + No OVP or OCP - However we lost 2 out of 5 which seems quite a lot. - EVGA EVbot needed ASUS Power Card The ASUS Power Card has a very nice design and great features. You can set the voltage directly on the card and you don't have to use an external controller. This is great for one card but using 4 cards with all the cables it's not that easy to access. Elmor is doing a great job with the development and if you have any feedback or problems let him know! He also recommended to me to place some additional heatsinks on the inductors and use a very strong fan for TitanX. We could run 1,8 Volt at over 2000 MHz on the GPU without any problems so the card is indeed very well designed. Just over 1,85 Volt we had OVP which I'm sure Elmor can solve with a new firmware. Conclusion about ASUS Power card: + Good design and easy to use + No controller needed (good for single/dual card) + No OCP + Firmware is easy to flash over micro USB - Difficult to use in 4 way without controller - OVP above 1,85 Volt. - Current heatsink is too high for 4-way Overall conclusion: All cards have their positive and negative aspects. In general for TitanX I would recommend EVGA EPower or the ASUS Power Card. However my personal favorite is the ASUS Power card. Simply because it's so easy to use and if there is any problem Elmor can simply send a new firmware to you. Edited April 20, 2015 by der8auer 1 Quote Link to comment Share on other sites More sharing options...
Alex@ro Posted April 20, 2015 Share Posted April 20, 2015 Madness ! Very nice info ! Quote Link to comment Share on other sites More sharing options...
Xtreme Addict Posted April 20, 2015 Share Posted April 20, 2015 Nice info. Regarding Epower dying issues, not sure but maybe new batches are just more fragile? I remember first batch of production was very strong and later batches were dying all the time, even on GTX 750 Ti cards 1 Quote Link to comment Share on other sites More sharing options...
Wizerty Posted April 20, 2015 Share Posted April 20, 2015 That's a really nice feedback, I wasn't expected this from g-powerbaord... A-pwr : 1.85v is not enought really ? how much drop you've got ? Have you try to solder feedback wire on sense pin ? 1 Quote Link to comment Share on other sites More sharing options...
coolice Posted April 20, 2015 Share Posted April 20, 2015 1.85v measured from? Quote Link to comment Share on other sites More sharing options...
der8auer Posted April 20, 2015 Author Share Posted April 20, 2015 1,85 set at the Power Card directly Quote Link to comment Share on other sites More sharing options...
Splave Posted April 20, 2015 Share Posted April 20, 2015 madness Quote Link to comment Share on other sites More sharing options...
Hiwa Posted April 20, 2015 Share Posted April 20, 2015 best thread of the year for sure Quote Link to comment Share on other sites More sharing options...
dx4picco Posted April 20, 2015 Share Posted April 20, 2015 nice work guys Quote Link to comment Share on other sites More sharing options...
Strat Posted April 20, 2015 Share Posted April 20, 2015 Great work and great review. Congratz Quote Link to comment Share on other sites More sharing options...
l0ud_sil3nc3 Posted April 21, 2015 Share Posted April 21, 2015 Great read Quote Link to comment Share on other sites More sharing options...
phil Posted April 21, 2015 Share Posted April 21, 2015 Great job Roman.I also expirienced the Mhz drop when I used second rail of gpower on a GTX 260 for memory.Using an extra epower on the memory I got back the lost Mhz. Quote Link to comment Share on other sites More sharing options...
elmor Posted April 21, 2015 Share Posted April 21, 2015 1,85 set at the Power Card directly Part of it is that you added some sensing modifications we suggested to improve droop conditions, could be part of the reason why this happens. Those mods 1.8V set on the power card would give us 1.76V loaded on the GPU side (just below 2G core, almost 500A average current). 2 Quote Link to comment Share on other sites More sharing options...
nickolp1974 Posted April 23, 2015 Share Posted April 23, 2015 Nice thread and great to see Roman modding these cards, the guys a machine! Doing this stuff till 10PM+ impressive indeed and good job Quote Link to comment Share on other sites More sharing options...
Jimba Posted April 23, 2015 Share Posted April 23, 2015 excellent thread! But where does one get Epower/Gpower/Apower? I want one..of each.. Quote Link to comment Share on other sites More sharing options...
skulstation Posted April 23, 2015 Share Posted April 23, 2015 nice info. its make tikel my fingers to order a epower from http://de.evga.com/products/moreInfo.asp?pn=100-UC-0400-BR&family=Accessories Quote Link to comment Share on other sites More sharing options...
der8auer Posted April 23, 2015 Author Share Posted April 23, 2015 60€ is a great price for those units. Quote Link to comment Share on other sites More sharing options...
zeropluszero Posted April 23, 2015 Share Posted April 23, 2015 excellent thread!But where does one get Epower/Gpower/Apower? I want one..of each.. They'll look really good on your shelf with everything else. 1 Quote Link to comment Share on other sites More sharing options...
TiN Posted April 24, 2015 Share Posted April 24, 2015 (edited) Great info, thanks for sharing. Had used same amount of cards with EPower, zero issues, all cards and EPOWERs alive still after all Vince's abuses. Side note - there is a 4-position DIP-switch on EPower to set voltage as well, so you can control voltage without EVBOT, just not as much precise as with it. EPOWER is product available for sale Edited April 24, 2015 by TiN Quote Link to comment Share on other sites More sharing options...
zeropluszero Posted April 24, 2015 Share Posted April 24, 2015 EPOWER is product available for sale Give this guy a marketing job. Quote Link to comment Share on other sites More sharing options...
TiN Posted April 24, 2015 Share Posted April 24, 2015 No way Quote Link to comment Share on other sites More sharing options...
Crew Leeghoofd Posted April 24, 2015 Crew Share Posted April 24, 2015 No way Four way ? Quote Link to comment Share on other sites More sharing options...
newlife Posted April 25, 2015 Share Posted April 25, 2015 Overclockers UK has them for 40 euros and is only place I know that will ship to Australia although it costs as much as the epower for shipping https://www.overclockers.co.uk/showproduct.php?prodid=GX-241-EA Quote Link to comment Share on other sites More sharing options...
rtsurfer Posted April 25, 2015 Share Posted April 25, 2015 EPOWER is product available for sale How about some for the U.S guys.? Quote Link to comment Share on other sites More sharing options...
zeropluszero Posted April 25, 2015 Share Posted April 25, 2015 Overclockers UK has them for 40 euros and is only place I know that will ship to Australia although it costs as much as the epower for shipping https://www.overclockers.co.uk/showproduct.php?prodid=GX-241-EA Its pounds not euro Quote Link to comment Share on other sites More sharing options...
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